TY  - CONF
AU  - Branković, Goran
AU  - Branković, Zorica
AU  - Vojisavljević, Katarina
AU  - Malešević, Aleksandar
AU  - Marinković Stanojević, Zorica
AU  - Počuča-Nešić, Milica
AU  - Mitrović, Jelena
AU  - Rostovtsev, Yuri
PY  - 2023
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2088
AB  - Numerous methods have been utilized for molecular detection, including optical, calorimetric, acoustic, and techniques based on changes in electrical properties, such as metal oxide semiconductor sensors [1,2]. Recent research endeavors have led to a significant rise in sensitivity, detecting parts per billion (ppb) [3], but the challenges of selectivity and cross-sensing remain crucial areas of investigation. Developing a gas sensor with high selectivity to efficiently analyze multi-gas mixtures would be of great significance, with potential applications in various fields such as technology, environmental control, biology, and medicine.
Quantum sensors are a promising new technology for the detection of gas mixtures. They offer a number of advantages over traditional methods, including high sensitivity, selectivity, and response time. In the presentation, we propose a new method based on the resonant interaction of dipole molecules with ac fields, in the presence of a dc electric and magnetic field that creates Zeeman and Stark splitting of molecular levels specific to certain molecules, ensuring selectivity [4].
In this talk, we present some preliminary experimental results obtained for the molecule NO on the use of quantum sensors for the detection of gas mixtures. Our results demonstrate the potential of quantum sensors for a variety of applications in gas sensing. We believe that quantum sensors have the potential to revolutionize the field of gas sensing.
1. X. Liu, et al. Sensors (Basel), 12 (2012) 9635–9665.
2. S. Lakkis, R. Younes, Y. Alayli, M. Sawan, Sensor Review, 34 (2014) 24–35.
3. J.-H. Lee, J.-Y. Kim, J.-H. Kim, S. S. Kim, Sensors (Basel), 19 (2019) 726.
4. Z. Branković, Y. Rostovtsev, Sci. Rep., 10 (2020) 1537.
PB  - University of Belgrade, Institute for Multidisciplinary Research
C3  - 7th Conference of the Serbian Society for Ceramic Materials, 7CSCS-2023, June 14-16, 2023, Belgrade, Serbia
T1  - Quantum sensors for gas mixture detection
SP  - 43
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2088
ER  - 

@conference{
author = "Branković, Goran and Branković, Zorica and Vojisavljević, Katarina and Malešević, Aleksandar and Marinković Stanojević, Zorica and Počuča-Nešić, Milica and Mitrović, Jelena and Rostovtsev, Yuri",
year = "2023",
abstract = "Numerous methods have been utilized for molecular detection, including optical, calorimetric, acoustic, and techniques based on changes in electrical properties, such as metal oxide semiconductor sensors [1,2]. Recent research endeavors have led to a significant rise in sensitivity, detecting parts per billion (ppb) [3], but the challenges of selectivity and cross-sensing remain crucial areas of investigation. Developing a gas sensor with high selectivity to efficiently analyze multi-gas mixtures would be of great significance, with potential applications in various fields such as technology, environmental control, biology, and medicine.
Quantum sensors are a promising new technology for the detection of gas mixtures. They offer a number of advantages over traditional methods, including high sensitivity, selectivity, and response time. In the presentation, we propose a new method based on the resonant interaction of dipole molecules with ac fields, in the presence of a dc electric and magnetic field that creates Zeeman and Stark splitting of molecular levels specific to certain molecules, ensuring selectivity [4].
In this talk, we present some preliminary experimental results obtained for the molecule NO on the use of quantum sensors for the detection of gas mixtures. Our results demonstrate the potential of quantum sensors for a variety of applications in gas sensing. We believe that quantum sensors have the potential to revolutionize the field of gas sensing.
1. X. Liu, et al. Sensors (Basel), 12 (2012) 9635–9665.
2. S. Lakkis, R. Younes, Y. Alayli, M. Sawan, Sensor Review, 34 (2014) 24–35.
3. J.-H. Lee, J.-Y. Kim, J.-H. Kim, S. S. Kim, Sensors (Basel), 19 (2019) 726.
4. Z. Branković, Y. Rostovtsev, Sci. Rep., 10 (2020) 1537.",
publisher = "University of Belgrade, Institute for Multidisciplinary Research",
journal = "7th Conference of the Serbian Society for Ceramic Materials, 7CSCS-2023, June 14-16, 2023, Belgrade, Serbia",
title = "Quantum sensors for gas mixture detection",
pages = "43",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2088"
}

Branković, G., Branković, Z., Vojisavljević, K., Malešević, A., Marinković Stanojević, Z., Počuča-Nešić, M., Mitrović, J.,& Rostovtsev, Y.. (2023). Quantum sensors for gas mixture detection. in 7th Conference of the Serbian Society for Ceramic Materials, 7CSCS-2023, June 14-16, 2023, Belgrade, Serbia
University of Belgrade, Institute for Multidisciplinary Research., 43.
https://hdl.handle.net/21.15107/rcub_rimsi_2088

Branković G, Branković Z, Vojisavljević K, Malešević A, Marinković Stanojević Z, Počuča-Nešić M, Mitrović J, Rostovtsev Y. Quantum sensors for gas mixture detection. in 7th Conference of the Serbian Society for Ceramic Materials, 7CSCS-2023, June 14-16, 2023, Belgrade, Serbia. 2023;:43.
https://hdl.handle.net/21.15107/rcub_rimsi_2088 .

Branković, Goran, Branković, Zorica, Vojisavljević, Katarina, Malešević, Aleksandar, Marinković Stanojević, Zorica, Počuča-Nešić, Milica, Mitrović, Jelena, Rostovtsev, Yuri, "Quantum sensors for gas mixture detection" in 7th Conference of the Serbian Society for Ceramic Materials, 7CSCS-2023, June 14-16, 2023, Belgrade, Serbia (2023):43,
https://hdl.handle.net/21.15107/rcub_rimsi_2088 .

TY  - CONF
AU  - Vukašinović, Jelena
AU  - Počuča-Nešić, Milica
AU  - Malešević, Aleksandar
AU  - Zemljak, Olivera
AU  - Podlogar, Matejka
AU  - Drev, Sandra
AU  - Bernik, Slavko
AU  - Branković, Goran
PY  - 2023
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2074
AB  - Barium-stannate (BaSnO3, BSO) is a member of the perovskite-type alkaline
earth stannates ASnO3 (A = Ca, Sr, Ba) with an ideal cubic crystal structure (space
group: ). Doping with antimony (Sb5+) can change this wide band-gap
semiconductor (Eg = 3.1-3.4 eV) into an n-type semiconductor with high electrical
conductivity at room temperature. The major drawbacks in the BSO-based ceramics
synthesis are phase composition and low density of final ceramic materials. These
problems could be solved using spark plasma sintering (SPS), a current and
pressure-assisted technique, which enables the preparation of dense ceramics at
significantly lower temperatures and for a shorter time.
To investigate the influence of spark plasma sintering temperature on the
structural, microstructural and electrical properties of BaSn1-xSbxO3 (BSSO, x =
0.00; 0,04; 0.06; 0.08; and 0.10) ceramics samples, BSSO powders were spark
plasma sintered at 1100 °C, 1200 °C and 1250 °C for 5 min.
X-ray diffraction (XRD) analysis confirmed that all ceramic samples sintered at
1100 °C crystallized in a single-phased cubic BSO structure. Their relative densities
were in the range of 72–82% ρt. Sintering at 1200 °C increased the samples’ relative
densities to 79–96% ρt, but also induced the formation of a barium-rich secondary
phase, Ba2SnO4. Rising the sintering temperature further to 1250 °C induced the
melting of all samples except BaSn0.92Sb0.08O3. Field emission scanning electron
microscopy (FE-SEM) revealed that doping with antimony decreased the grain sizes
in BSSO samples sintered at 1100 °C and 1200 °C up to the concentration x = 0.08.
Electrical measurements revealed the typical semiconductor behavior of the
undoped samples, showing nonlinear current-voltage characteristic and the existence
of one semicircle in their impedance spectra, characteristic for materials with double
Schottky barrier at the grain boundaries. However, samples with higher dopant
concentrations (x = 0.08 and 0.10) showed significantly lower electrical resistivity
and linear current-voltage characteristic. The lowest and almost constant value of
electrical resistivity in the temperature range of 25–150 °C, and complete loss of the
semicircle in its impedance spectrum revealed the metallic-like behavior of sample
BaSn0.92Sb0.08O3 sintered at 1200 °C.
PB  - University of Belgrade, Institute for Multidisciplinary Research
C3  - 7th Conference of the Serbian Society for Ceramic Materials, 7CSCS-2023, June 14-16, 2023, Belgrade, Serbia
T1  - The influence of spark plasma sintering temperature on the properties of Sb-doped barium stannate ceramics
SP  - 86
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2074
ER  - 

@conference{
author = "Vukašinović, Jelena and Počuča-Nešić, Milica and Malešević, Aleksandar and Zemljak, Olivera and Podlogar, Matejka and Drev, Sandra and Bernik, Slavko and Branković, Goran",
year = "2023",
abstract = "Barium-stannate (BaSnO3, BSO) is a member of the perovskite-type alkaline
earth stannates ASnO3 (A = Ca, Sr, Ba) with an ideal cubic crystal structure (space
group: ). Doping with antimony (Sb5+) can change this wide band-gap
semiconductor (Eg = 3.1-3.4 eV) into an n-type semiconductor with high electrical
conductivity at room temperature. The major drawbacks in the BSO-based ceramics
synthesis are phase composition and low density of final ceramic materials. These
problems could be solved using spark plasma sintering (SPS), a current and
pressure-assisted technique, which enables the preparation of dense ceramics at
significantly lower temperatures and for a shorter time.
To investigate the influence of spark plasma sintering temperature on the
structural, microstructural and electrical properties of BaSn1-xSbxO3 (BSSO, x =
0.00; 0,04; 0.06; 0.08; and 0.10) ceramics samples, BSSO powders were spark
plasma sintered at 1100 °C, 1200 °C and 1250 °C for 5 min.
X-ray diffraction (XRD) analysis confirmed that all ceramic samples sintered at
1100 °C crystallized in a single-phased cubic BSO structure. Their relative densities
were in the range of 72–82% ρt. Sintering at 1200 °C increased the samples’ relative
densities to 79–96% ρt, but also induced the formation of a barium-rich secondary
phase, Ba2SnO4. Rising the sintering temperature further to 1250 °C induced the
melting of all samples except BaSn0.92Sb0.08O3. Field emission scanning electron
microscopy (FE-SEM) revealed that doping with antimony decreased the grain sizes
in BSSO samples sintered at 1100 °C and 1200 °C up to the concentration x = 0.08.
Electrical measurements revealed the typical semiconductor behavior of the
undoped samples, showing nonlinear current-voltage characteristic and the existence
of one semicircle in their impedance spectra, characteristic for materials with double
Schottky barrier at the grain boundaries. However, samples with higher dopant
concentrations (x = 0.08 and 0.10) showed significantly lower electrical resistivity
and linear current-voltage characteristic. The lowest and almost constant value of
electrical resistivity in the temperature range of 25–150 °C, and complete loss of the
semicircle in its impedance spectrum revealed the metallic-like behavior of sample
BaSn0.92Sb0.08O3 sintered at 1200 °C.",
publisher = "University of Belgrade, Institute for Multidisciplinary Research",
journal = "7th Conference of the Serbian Society for Ceramic Materials, 7CSCS-2023, June 14-16, 2023, Belgrade, Serbia",
title = "The influence of spark plasma sintering temperature on the properties of Sb-doped barium stannate ceramics",
pages = "86",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2074"
}

Vukašinović, J., Počuča-Nešić, M., Malešević, A., Zemljak, O., Podlogar, M., Drev, S., Bernik, S.,& Branković, G.. (2023). The influence of spark plasma sintering temperature on the properties of Sb-doped barium stannate ceramics. in 7th Conference of the Serbian Society for Ceramic Materials, 7CSCS-2023, June 14-16, 2023, Belgrade, Serbia
University of Belgrade, Institute for Multidisciplinary Research., 86.
https://hdl.handle.net/21.15107/rcub_rimsi_2074

Vukašinović J, Počuča-Nešić M, Malešević A, Zemljak O, Podlogar M, Drev S, Bernik S, Branković G. The influence of spark plasma sintering temperature on the properties of Sb-doped barium stannate ceramics. in 7th Conference of the Serbian Society for Ceramic Materials, 7CSCS-2023, June 14-16, 2023, Belgrade, Serbia. 2023;:86.
https://hdl.handle.net/21.15107/rcub_rimsi_2074 .

Vukašinović, Jelena, Počuča-Nešić, Milica, Malešević, Aleksandar, Zemljak, Olivera, Podlogar, Matejka, Drev, Sandra, Bernik, Slavko, Branković, Goran, "The influence of spark plasma sintering temperature on the properties of Sb-doped barium stannate ceramics" in 7th Conference of the Serbian Society for Ceramic Materials, 7CSCS-2023, June 14-16, 2023, Belgrade, Serbia (2023):86,
https://hdl.handle.net/21.15107/rcub_rimsi_2074 .

TY  - JOUR
AU  - Mitrović, Jelena
AU  - Rapljenović, Željko
AU  - Počuča-Nešić, Milica
AU  - Ivek, Tomislav
AU  - Branković, Zorica
AU  - Branković, Goran
PY  - 2023
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2013
AB  - The influence of structural defects in spark plasma sintered BaSn1-xSbxO3 (BSSO, x=0.00 and 0.08)
ceramic samples on their electrical properties was investigated in the temperature range of 300–4K.
X-ray photoelectron spectroscopy (XPS) revealed the presence of point defects, primarily oxygen
vacancies (VO) and mixed oxidation states of tin (Sn2+/Sn4+) in both samples. As a result, the
undoped BSSO sample exibited a non-standard semiconductor behavior, retaining its temperaturedependent
resistivity. The electrical resistivity of the doped samples was two orders of magnitude
lower than that of the undoped sample. The presence of structural defects such asVO, mixed oxidation
states of the constituent elements, and significant amounts ofO− species make the electrical resistivity
of the doped sample constant in the temperature range of 300–70 K, indicating heavily-doped
semiconductor behavior.
PB  - IOP Publishing Ltd
T2  - Materials Research Express
T1  - The crucial role of defect structure in understanding the electrical properties of spark plasma sintered antimony doped barium stannate
SP  - 015901
VL  - 10
DO  - https://doi.org/10.1088/2053-1591/acb3b0
ER  - 

@article{
author = "Mitrović, Jelena and Rapljenović, Željko and Počuča-Nešić, Milica and Ivek, Tomislav and Branković, Zorica and Branković, Goran",
year = "2023",
abstract = "The influence of structural defects in spark plasma sintered BaSn1-xSbxO3 (BSSO, x=0.00 and 0.08)
ceramic samples on their electrical properties was investigated in the temperature range of 300–4K.
X-ray photoelectron spectroscopy (XPS) revealed the presence of point defects, primarily oxygen
vacancies (VO) and mixed oxidation states of tin (Sn2+/Sn4+) in both samples. As a result, the
undoped BSSO sample exibited a non-standard semiconductor behavior, retaining its temperaturedependent
resistivity. The electrical resistivity of the doped samples was two orders of magnitude
lower than that of the undoped sample. The presence of structural defects such asVO, mixed oxidation
states of the constituent elements, and significant amounts ofO− species make the electrical resistivity
of the doped sample constant in the temperature range of 300–70 K, indicating heavily-doped
semiconductor behavior.",
publisher = "IOP Publishing Ltd",
journal = "Materials Research Express",
title = "The crucial role of defect structure in understanding the electrical properties of spark plasma sintered antimony doped barium stannate",
pages = "015901",
volume = "10",
doi = "https://doi.org/10.1088/2053-1591/acb3b0"
}

Mitrović, J., Rapljenović, Ž., Počuča-Nešić, M., Ivek, T., Branković, Z.,& Branković, G.. (2023). The crucial role of defect structure in understanding the electrical properties of spark plasma sintered antimony doped barium stannate. in Materials Research Express
IOP Publishing Ltd., 10, 015901.
https://doi.org/https://doi.org/10.1088/2053-1591/acb3b0

Mitrović J, Rapljenović Ž, Počuča-Nešić M, Ivek T, Branković Z, Branković G. The crucial role of defect structure in understanding the electrical properties of spark plasma sintered antimony doped barium stannate. in Materials Research Express. 2023;10:015901.
doi:https://doi.org/10.1088/2053-1591/acb3b0 .

Mitrović, Jelena, Rapljenović, Željko, Počuča-Nešić, Milica, Ivek, Tomislav, Branković, Zorica, Branković, Goran, "The crucial role of defect structure in understanding the electrical properties of spark plasma sintered antimony doped barium stannate" in Materials Research Express, 10 (2023):015901,
https://doi.org/https://doi.org/10.1088/2053-1591/acb3b0 . .

TY  - THES
AU  - Mitrović, Jelena
PY  - 2023
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2021
AB  - U okviru ove disertacije ispitivani su uticaji koncentracije dopanta i parametara sinterovanja na strukturu i svojstva keramičkih uzoraka barijum-stanata dopiranog antimonom, BaSn1-xSbxO3 (BSSO, x = 0,00; 0,04; 0,06; 0,08 i 0,10) u cilju dobijanja provodne elektrokeramike sa linearnom strujno-naponskom (I-U) karakteristikom. Smeša prahova BaCO3, SnO2 i Sb2O3 mehanički je aktivirana u izopropanolu, kalcinisana na 900 °C i potom sinterovana koristeći tri različite metode: konvencionalno, spark plazma i hladno sinterovanje. Konvencionalno sinterovanje prahova vršeno je na 1200, 1400 i 1600 °C, ali se na nižim temperaturama dobija keramički materijal niskih relativnih gustina. Sinterovanjem na 1600 °C dobijeni su jednofazni uzorci kubne strukture BaSnO3 (BSO). Rezultati skenirajuće elektronske mikroskopije (engl. Scanning Electron Microscopy, SEM) ukazuju na značajno smanjenje veličine zrna nakon dopiranja, ali i na poroznost koja ometa električnu karakterizaciju uzoraka. Transmisiona elektronska mikroskopija visoke rezolucije (engl. High Resolution Transmission Electron Microscopy, HRTEM) ukazuje na prisustvo niskougaonih granica zrna u uzorku BaSn0,92Sb0,08O3. Pouzdana električna merenja izvršena na ovom uzorku ukazuju na njegova poluprovodnička svojstva karakteristična za materijale sa dvostrukom Šotkijevom barijerom (engl. Schottky barrier) na granici zrna. Spark plazma sinterovanje (SPS) vršeno je na temperaturama od 1000, 1100, 1200 i 1250 °C, za vreme od 5, 10, 15 i 30 min, pri pritisku od 60 MPa i sa brzinom zagrevanja od 100 °C min–1. Za dobijanje guste keramike optimalni uslovi sinterovanja su 1100 i 1200 °C, tokom 5 min. Sinterovanjem na 1100 °C dobijeni su jednofazni keramički uzorci kubne strukture BSO. Dopiranje antimonom dovodi do smanjenja veličine zrna, ali i do smanjenja specifične otpornosti u odnosu na nedopirani uzorak. Električna karakterizacija ukazuje na poluprovodnička svojstva svih keramičkih uzoraka, sa najnižom specifičnom otpornošću zabeleženom na uzorku BaSn0,92Sb0,08O3. SPS na 1200 °C dobijaju se keramički uzorci koji osim kubne faze BSO, sadrže i sekundarnu fazu Ba2SnO4, čija se količina u uzorku smanjuje dopiranjem. Na ovoj temperaturi pri visokom pritisku dolazi do reakcije SnO2 iz kalcinisanog praha sa grafitom iz kalupa pri čemu se izdvaja elementarni kalaj i stvaraju uslovi za formiranje sekundarne faze bogate barijumom. Rezultati skenirajuće elektronske mikroskopije emisijom elektrona poljem (engl. Field Emission Scanning Electron Microscopy, FE-SEM) ovih uzoraka potvrđuju da dopiranjem dolazi do smanjenja veličine zrna, ali i smanjenja koncentracije
iv
dislokacija u keramičkim uzorcima. Svi uzorci osim BaSn0,92Sb0,08O3 ispoljavaju nelinearnu strujno-naponsku karakteristiku, tipičnu za poluprovodnike sa potencijalnom barijerom na granici zrna. Veliki udeo niskougaonih granica u uzorku BaSn0,92Sb0,08O3 dovodi do gubitka potencijalne barijere na granici zrna, što je potvrđeno i impedansnom spektroskopijom, pa ovaj uzorak pokazuje najnižu vrednost specifične otpornosti, konstantnu u temperaturnom opsegu 25–150 °C i linearnu strujno-naponsku karakteristiku. Za razliku od prethodne metode, hladno sinterovanje uzorka BaSn0,92Sb0,08O3 nije dalo zadovoljavajuće rezultate po pitanju faznog sastava, gustine i električnih svojstava. Redukcioni uslovi tipični za spark plazma sinterovanje, uz koncentraciju dopanta od 8 % (mol.) Sb u uzorku BaSnO3 doveli su do formiranja niskougaonih granica zrna, povećanja koncentracije vakancija kiseonika i promene valence Sn, što je dovelo do porasta koncentracije nosilaca naelektrisanja (elektrona) i posledično rezultovalo dobijanjem uzorka sa linearnom I-U karakteristikom i konstantnom vrednosti specifične otpornosti u širem temperaturnom opsegu.
AB  - The main goal of this doctoral thesis was to investigate the influence of different dopant concentrations and sintering parameters on the structure and properties of antimony-doped barium stannate, BaSn1-xSbxO3 (BSSO, x = 0,00; 0,04; 0,06; 0,08 and 0,10) to obtain conductive electroceramic samples with linear current-voltage (I-U) characteristics. A mixture of BaCO3, SnO2 and Sb2O3 powders was mechanically activated in isopropanol, calcined at 900 °C and then sintered using three different methods: conventional, spark plasma and cold sintering. Conventional sintering at 1200 and 1400 °C resulted in the preparation of low-density ceramic samples. By sintering at 1600 °C, single-phase material with a cubic BaSnO3 (BSO) structure was obtained. The scanning electron microscopy results (SEM) indicate a significant decrease in grain size upon doping but also reveal porosity, which hinders the electrical characterization of the samples. High resolution transmission electron microscopy (HRTEM) indicates the presence of low-angle grain boundaries (LAGBs) in the BaSn0.92Sb0.08O3 sample. Reliable electrical measurements performed on this sample indicate its semiconducting properties characteristic of materials with a double Schottky barrier at the grain boundary. Spark plasma sintering (SPS) was performed at temperatures 1000, 1100, 1200 and 1250 °C, for 5, 10, 15 and 30 min, at a pressure of 60 MPa and with a heating rate of 100 °C min–1. The most optimal conditions for the preparation of dense ceramic materials, in terms of temperatures and sintering time, were 1100 and 1200 °C for 5 min. By sintering at 1100 °C, single-phase ceramic samples with a cubic BSO structure were obtained. In comparison to the undoped sample, doping with Sb leads to a decrease in both grain size and electrical resisitivity. Electrical characterization shows semiconducting properties of all ceramic materials, with the lowest resistivity recorded for the BaSn0.92Sb0.08O3 sample. Apart from the cubic BSO, the spark plasma sintered samples at 1200 °C contained Ba2SnO4 as a secondary phase, whose content decreases upon doping. High sintering temperature and applied pressure created conditions for the reaction of SnO2 from the calcined powder with graphite from the mould, resulting in the evaporation of metallic tin and the formation of the barium-rich secondary phase. The field emission scanning electron microscopy (FE-SEM) results confirm that doping leads to a decrease in grain size and the concentration of dislocations in these ceramic samples. All samples except BaSn0.92Sb0.08O3 exhibit nonlinear current-voltage characteristics, typical for semiconductors with a
vi
potential barrier at the grain boundary. As a consequence of higher amount of LAGBs present in it, the ceramic BaSn0.92Sb0.08O3, showed linear I-U characteristics in the whole temperature measurement range (25–150 °C) and a significant drop in the electrical resistivity due to the loss of potential barrier at grain boundary. The impedance spectroscopy confirmed these assumptions. Unlike the previous method, cold sintering of the BaSn0.92Sb0.08O3 sample did not give satisfactory results either in phase composition and density or electrical properties. The reducing conditions typical for spark plasma sintering and the dopant concentration of 8 % (mol) Sb in the BaSnO3 sample led to the formation of LAGBs, an increase in the concentration of oxygen vacancies and a change in the valence state of Sn, consequently leading to increase in the charge carriers (electrons) concentration and resulting in the ceramic sample with a linear I-U characteristic and a constant value of electric resistivity in a wide temperature range.
PB  - Univerzitet u Beogradu, Hemijski fakultet
T2  - Univerzitet u Beogradu, Hemijski fakultet
T1  - Dobijanje provodne elektrokeramike na bazi  barijum-stanata dopiranog antimonom sa linearnom strujno-naponskom karakteristikom
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2021
ER  - 

@phdthesis{
author = "Mitrović, Jelena",
year = "2023",
abstract = "U okviru ove disertacije ispitivani su uticaji koncentracije dopanta i parametara sinterovanja na strukturu i svojstva keramičkih uzoraka barijum-stanata dopiranog antimonom, BaSn1-xSbxO3 (BSSO, x = 0,00; 0,04; 0,06; 0,08 i 0,10) u cilju dobijanja provodne elektrokeramike sa linearnom strujno-naponskom (I-U) karakteristikom. Smeša prahova BaCO3, SnO2 i Sb2O3 mehanički je aktivirana u izopropanolu, kalcinisana na 900 °C i potom sinterovana koristeći tri različite metode: konvencionalno, spark plazma i hladno sinterovanje. Konvencionalno sinterovanje prahova vršeno je na 1200, 1400 i 1600 °C, ali se na nižim temperaturama dobija keramički materijal niskih relativnih gustina. Sinterovanjem na 1600 °C dobijeni su jednofazni uzorci kubne strukture BaSnO3 (BSO). Rezultati skenirajuće elektronske mikroskopije (engl. Scanning Electron Microscopy, SEM) ukazuju na značajno smanjenje veličine zrna nakon dopiranja, ali i na poroznost koja ometa električnu karakterizaciju uzoraka. Transmisiona elektronska mikroskopija visoke rezolucije (engl. High Resolution Transmission Electron Microscopy, HRTEM) ukazuje na prisustvo niskougaonih granica zrna u uzorku BaSn0,92Sb0,08O3. Pouzdana električna merenja izvršena na ovom uzorku ukazuju na njegova poluprovodnička svojstva karakteristična za materijale sa dvostrukom Šotkijevom barijerom (engl. Schottky barrier) na granici zrna. Spark plazma sinterovanje (SPS) vršeno je na temperaturama od 1000, 1100, 1200 i 1250 °C, za vreme od 5, 10, 15 i 30 min, pri pritisku od 60 MPa i sa brzinom zagrevanja od 100 °C min–1. Za dobijanje guste keramike optimalni uslovi sinterovanja su 1100 i 1200 °C, tokom 5 min. Sinterovanjem na 1100 °C dobijeni su jednofazni keramički uzorci kubne strukture BSO. Dopiranje antimonom dovodi do smanjenja veličine zrna, ali i do smanjenja specifične otpornosti u odnosu na nedopirani uzorak. Električna karakterizacija ukazuje na poluprovodnička svojstva svih keramičkih uzoraka, sa najnižom specifičnom otpornošću zabeleženom na uzorku BaSn0,92Sb0,08O3. SPS na 1200 °C dobijaju se keramički uzorci koji osim kubne faze BSO, sadrže i sekundarnu fazu Ba2SnO4, čija se količina u uzorku smanjuje dopiranjem. Na ovoj temperaturi pri visokom pritisku dolazi do reakcije SnO2 iz kalcinisanog praha sa grafitom iz kalupa pri čemu se izdvaja elementarni kalaj i stvaraju uslovi za formiranje sekundarne faze bogate barijumom. Rezultati skenirajuće elektronske mikroskopije emisijom elektrona poljem (engl. Field Emission Scanning Electron Microscopy, FE-SEM) ovih uzoraka potvrđuju da dopiranjem dolazi do smanjenja veličine zrna, ali i smanjenja koncentracije
iv
dislokacija u keramičkim uzorcima. Svi uzorci osim BaSn0,92Sb0,08O3 ispoljavaju nelinearnu strujno-naponsku karakteristiku, tipičnu za poluprovodnike sa potencijalnom barijerom na granici zrna. Veliki udeo niskougaonih granica u uzorku BaSn0,92Sb0,08O3 dovodi do gubitka potencijalne barijere na granici zrna, što je potvrđeno i impedansnom spektroskopijom, pa ovaj uzorak pokazuje najnižu vrednost specifične otpornosti, konstantnu u temperaturnom opsegu 25–150 °C i linearnu strujno-naponsku karakteristiku. Za razliku od prethodne metode, hladno sinterovanje uzorka BaSn0,92Sb0,08O3 nije dalo zadovoljavajuće rezultate po pitanju faznog sastava, gustine i električnih svojstava. Redukcioni uslovi tipični za spark plazma sinterovanje, uz koncentraciju dopanta od 8 % (mol.) Sb u uzorku BaSnO3 doveli su do formiranja niskougaonih granica zrna, povećanja koncentracije vakancija kiseonika i promene valence Sn, što je dovelo do porasta koncentracije nosilaca naelektrisanja (elektrona) i posledično rezultovalo dobijanjem uzorka sa linearnom I-U karakteristikom i konstantnom vrednosti specifične otpornosti u širem temperaturnom opsegu., The main goal of this doctoral thesis was to investigate the influence of different dopant concentrations and sintering parameters on the structure and properties of antimony-doped barium stannate, BaSn1-xSbxO3 (BSSO, x = 0,00; 0,04; 0,06; 0,08 and 0,10) to obtain conductive electroceramic samples with linear current-voltage (I-U) characteristics. A mixture of BaCO3, SnO2 and Sb2O3 powders was mechanically activated in isopropanol, calcined at 900 °C and then sintered using three different methods: conventional, spark plasma and cold sintering. Conventional sintering at 1200 and 1400 °C resulted in the preparation of low-density ceramic samples. By sintering at 1600 °C, single-phase material with a cubic BaSnO3 (BSO) structure was obtained. The scanning electron microscopy results (SEM) indicate a significant decrease in grain size upon doping but also reveal porosity, which hinders the electrical characterization of the samples. High resolution transmission electron microscopy (HRTEM) indicates the presence of low-angle grain boundaries (LAGBs) in the BaSn0.92Sb0.08O3 sample. Reliable electrical measurements performed on this sample indicate its semiconducting properties characteristic of materials with a double Schottky barrier at the grain boundary. Spark plasma sintering (SPS) was performed at temperatures 1000, 1100, 1200 and 1250 °C, for 5, 10, 15 and 30 min, at a pressure of 60 MPa and with a heating rate of 100 °C min–1. The most optimal conditions for the preparation of dense ceramic materials, in terms of temperatures and sintering time, were 1100 and 1200 °C for 5 min. By sintering at 1100 °C, single-phase ceramic samples with a cubic BSO structure were obtained. In comparison to the undoped sample, doping with Sb leads to a decrease in both grain size and electrical resisitivity. Electrical characterization shows semiconducting properties of all ceramic materials, with the lowest resistivity recorded for the BaSn0.92Sb0.08O3 sample. Apart from the cubic BSO, the spark plasma sintered samples at 1200 °C contained Ba2SnO4 as a secondary phase, whose content decreases upon doping. High sintering temperature and applied pressure created conditions for the reaction of SnO2 from the calcined powder with graphite from the mould, resulting in the evaporation of metallic tin and the formation of the barium-rich secondary phase. The field emission scanning electron microscopy (FE-SEM) results confirm that doping leads to a decrease in grain size and the concentration of dislocations in these ceramic samples. All samples except BaSn0.92Sb0.08O3 exhibit nonlinear current-voltage characteristics, typical for semiconductors with a
vi
potential barrier at the grain boundary. As a consequence of higher amount of LAGBs present in it, the ceramic BaSn0.92Sb0.08O3, showed linear I-U characteristics in the whole temperature measurement range (25–150 °C) and a significant drop in the electrical resistivity due to the loss of potential barrier at grain boundary. The impedance spectroscopy confirmed these assumptions. Unlike the previous method, cold sintering of the BaSn0.92Sb0.08O3 sample did not give satisfactory results either in phase composition and density or electrical properties. The reducing conditions typical for spark plasma sintering and the dopant concentration of 8 % (mol) Sb in the BaSnO3 sample led to the formation of LAGBs, an increase in the concentration of oxygen vacancies and a change in the valence state of Sn, consequently leading to increase in the charge carriers (electrons) concentration and resulting in the ceramic sample with a linear I-U characteristic and a constant value of electric resistivity in a wide temperature range.",
publisher = "Univerzitet u Beogradu, Hemijski fakultet",
journal = "Univerzitet u Beogradu, Hemijski fakultet",
title = "Dobijanje provodne elektrokeramike na bazi  barijum-stanata dopiranog antimonom sa linearnom strujno-naponskom karakteristikom",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2021"
}

Mitrović, J.. (2023). Dobijanje provodne elektrokeramike na bazi  barijum-stanata dopiranog antimonom sa linearnom strujno-naponskom karakteristikom. in Univerzitet u Beogradu, Hemijski fakultet
Univerzitet u Beogradu, Hemijski fakultet..
https://hdl.handle.net/21.15107/rcub_rimsi_2021

Mitrović J. Dobijanje provodne elektrokeramike na bazi  barijum-stanata dopiranog antimonom sa linearnom strujno-naponskom karakteristikom. in Univerzitet u Beogradu, Hemijski fakultet. 2023;.
https://hdl.handle.net/21.15107/rcub_rimsi_2021 .

Mitrović, Jelena, "Dobijanje provodne elektrokeramike na bazi  barijum-stanata dopiranog antimonom sa linearnom strujno-naponskom karakteristikom" in Univerzitet u Beogradu, Hemijski fakultet (2023),
https://hdl.handle.net/21.15107/rcub_rimsi_2021 .

TY  - JOUR
AU  - Vojisavljević, Katarina
AU  - Savić, Slavica M.
AU  - Počuča-Nešić, Milica
AU  - Hodžić, Aden
AU  - Kriechbaum, Manfred
AU  - Ribić, Vesna
AU  - Rečnik, Aleksander
AU  - Mitrović, Jelena
AU  - Branković, Goran
AU  - Djokic, Veljko
PY  - 2023
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/1860
AB  - Developing highly efficient semiconductor metal oxide (SMOX) sensors capable of accurate and fast responses to environmental humidity is still a challenging task. In addition to a not so pronounced sensitivity to relative humidity change, most of the SMOXs cannot meet the criteria of real-time humidity sensing due to their long response/recovery time. The way to tackle this problem is to control adsorption/desorption processes, i.e., water-vapor molecular dynamics, over the sensor’s active layer through the powder and pore morphology design. With this in mind, a KIT-5-mediated synthesis was used to achieve mesoporous tin (IV) oxide replica (SnO2-R) with controlled pore size and ordering through template inversion and compared with a sol-gel synthesized powder (SnO2-SG). Unlike SnO2-SG, SnO2-R possessed a high specific surface area and quite an open pore structure, similar to the KIT-5, as observed by TEM, BET and SWAXS analyses. According to TEM, SnO2-R consisted of fine-grained globular particles and some percent of exaggerated, grown twinned crystals. The distinctive morphology of the SnO2-R-based sensor, with its specific pore structure and an increased number of oxygen-related defects associated with the powder preparation process and detected at the sensor surface by XPS analysis, contributed to excellent humidity sensing performances at room temperature, comprised of a low hysteresis error (3.7%), sensitivity of 406.8 kΩ/RH% and swift response/recovery speed (4 s/6 s).
PB  - MDPI
T2  - Molecules
T1  - KIT-5-Assisted Synthesis of Mesoporous SnO2 for High-Performance Humidity Sensors with a Swift Response/Recovery Speed
IS  - 4
SP  - 1754
VL  - 28
DO  - 10.3390/molecules28041754
ER  - 

@article{
author = "Vojisavljević, Katarina and Savić, Slavica M. and Počuča-Nešić, Milica and Hodžić, Aden and Kriechbaum, Manfred and Ribić, Vesna and Rečnik, Aleksander and Mitrović, Jelena and Branković, Goran and Djokic, Veljko",
year = "2023",
abstract = "Developing highly efficient semiconductor metal oxide (SMOX) sensors capable of accurate and fast responses to environmental humidity is still a challenging task. In addition to a not so pronounced sensitivity to relative humidity change, most of the SMOXs cannot meet the criteria of real-time humidity sensing due to their long response/recovery time. The way to tackle this problem is to control adsorption/desorption processes, i.e., water-vapor molecular dynamics, over the sensor’s active layer through the powder and pore morphology design. With this in mind, a KIT-5-mediated synthesis was used to achieve mesoporous tin (IV) oxide replica (SnO2-R) with controlled pore size and ordering through template inversion and compared with a sol-gel synthesized powder (SnO2-SG). Unlike SnO2-SG, SnO2-R possessed a high specific surface area and quite an open pore structure, similar to the KIT-5, as observed by TEM, BET and SWAXS analyses. According to TEM, SnO2-R consisted of fine-grained globular particles and some percent of exaggerated, grown twinned crystals. The distinctive morphology of the SnO2-R-based sensor, with its specific pore structure and an increased number of oxygen-related defects associated with the powder preparation process and detected at the sensor surface by XPS analysis, contributed to excellent humidity sensing performances at room temperature, comprised of a low hysteresis error (3.7%), sensitivity of 406.8 kΩ/RH% and swift response/recovery speed (4 s/6 s).",
publisher = "MDPI",
journal = "Molecules",
title = "KIT-5-Assisted Synthesis of Mesoporous SnO2 for High-Performance Humidity Sensors with a Swift Response/Recovery Speed",
number = "4",
pages = "1754",
volume = "28",
doi = "10.3390/molecules28041754"
}

Vojisavljević, K., Savić, S. M., Počuča-Nešić, M., Hodžić, A., Kriechbaum, M., Ribić, V., Rečnik, A., Mitrović, J., Branković, G.,& Djokic, V.. (2023). KIT-5-Assisted Synthesis of Mesoporous SnO2 for High-Performance Humidity Sensors with a Swift Response/Recovery Speed. in Molecules
MDPI., 28(4), 1754.
https://doi.org/10.3390/molecules28041754

Vojisavljević K, Savić SM, Počuča-Nešić M, Hodžić A, Kriechbaum M, Ribić V, Rečnik A, Mitrović J, Branković G, Djokic V. KIT-5-Assisted Synthesis of Mesoporous SnO2 for High-Performance Humidity Sensors with a Swift Response/Recovery Speed. in Molecules. 2023;28(4):1754.
doi:10.3390/molecules28041754 .

Vojisavljević, Katarina, Savić, Slavica M., Počuča-Nešić, Milica, Hodžić, Aden, Kriechbaum, Manfred, Ribić, Vesna, Rečnik, Aleksander, Mitrović, Jelena, Branković, Goran, Djokic, Veljko, "KIT-5-Assisted Synthesis of Mesoporous SnO2 for High-Performance Humidity Sensors with a Swift Response/Recovery Speed" in Molecules, 28, no. 4 (2023):1754,
https://doi.org/10.3390/molecules28041754 . .

TY  - CONF
AU  - Počuča-Nešić, Milica
AU  - Vukašinović, Jelena
AU  - Dapčević, Aleksandra
AU  - Ribić, Vesna
AU  - Branković, Zorica
AU  - Vojisavljević, Katarina
AU  - Marinković Stanojević, Zorica
AU  - Branković, Goran
PY  - 2022
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2031
AB  - Dyes released from textile industries present a big threat to the environment, and
remediation of wastewaters became one of the major scientific challenges. In recent
years, there has been a great need for catalysts that would oxidize pollutants under
dark ambient conditions without the use of external stimulants like light,
temperature, or additional chemicals such as O3, H2O2. Efficient work of these
catalysts would significantly reduce the energy consumption. Among other
materials, perovskite-type oxides with general formula ABO3 emerged as possible
catalysts for dye degradation in the dark conditions. Lanthanum nickelates with
single (LaNiO3) and layered perovskite structure (La4Ni3O10, La3Ni2O7, La2NiO4)
showed good catalytic properties, due to the existence of nickel in two oxidation
states (Ni2+ and Ni3+) and the oxygen non-stoichiometry in these materials [1].
This study presents structural, microstructural and catalytic properties of the
LaNi1-xNbxO3-based (xNb = 0.000, 0,005 and 0,010; La-Ni-Nb-O) powders prepared
by mechanical activation method. The XRD (X-Ray Diffraction) analysis revealed
the existence of a multiphase oxide system, including layered structures of
nickelates Lan+1NinO3n+1 (n = 3, 2, 1, 0) and NiO phase in all La-Ni-Nb-O-based
powders. Also, the HRTEM (High Resolution Transmission Electron Microscopy)
analysis confirmed the presence of structural polytypes in these powders. The
catalytic properties of La-Ni-Nb-O-based powders were investigated by degradation
of the anionic azo dye, Reactive Orange 16 (RO16), under dark ambient conditions
at different pH values (3, 6.5, 9.5 and 11) and temperature of 20 °C. The best
catalytic efficiency in the degradation of RO16 dye showed the sample with x(Nb) =
0.010 in acidic solution, where the residual of RO16 dye was about 4.5 % after 330
minutes. The reusability test for this powder in degradation process of RO16 dye
showed that the sample with x(Nb) = 0.010 retained its catalytic activity during three
cycles.
1. W. Zhong et al., Appl. Catal. A, Gen., 549 (2018) 302.
PB  - University of Belgrade, Institute for Multidisciplinary Research
C3  - 6th Conference of the Serbian Society for Ceramic Materials, 6CSCS-2022, June 28-29, 2022, Belgrade, Serbia
T1  - The catalytic degradation of RO16 dye under dark ambient conditions using La-Ni-Nb-O-based powders
SP  - 63
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2031
ER  - 

@conference{
author = "Počuča-Nešić, Milica and Vukašinović, Jelena and Dapčević, Aleksandra and Ribić, Vesna and Branković, Zorica and Vojisavljević, Katarina and Marinković Stanojević, Zorica and Branković, Goran",
year = "2022",
abstract = "Dyes released from textile industries present a big threat to the environment, and
remediation of wastewaters became one of the major scientific challenges. In recent
years, there has been a great need for catalysts that would oxidize pollutants under
dark ambient conditions without the use of external stimulants like light,
temperature, or additional chemicals such as O3, H2O2. Efficient work of these
catalysts would significantly reduce the energy consumption. Among other
materials, perovskite-type oxides with general formula ABO3 emerged as possible
catalysts for dye degradation in the dark conditions. Lanthanum nickelates with
single (LaNiO3) and layered perovskite structure (La4Ni3O10, La3Ni2O7, La2NiO4)
showed good catalytic properties, due to the existence of nickel in two oxidation
states (Ni2+ and Ni3+) and the oxygen non-stoichiometry in these materials [1].
This study presents structural, microstructural and catalytic properties of the
LaNi1-xNbxO3-based (xNb = 0.000, 0,005 and 0,010; La-Ni-Nb-O) powders prepared
by mechanical activation method. The XRD (X-Ray Diffraction) analysis revealed
the existence of a multiphase oxide system, including layered structures of
nickelates Lan+1NinO3n+1 (n = 3, 2, 1, 0) and NiO phase in all La-Ni-Nb-O-based
powders. Also, the HRTEM (High Resolution Transmission Electron Microscopy)
analysis confirmed the presence of structural polytypes in these powders. The
catalytic properties of La-Ni-Nb-O-based powders were investigated by degradation
of the anionic azo dye, Reactive Orange 16 (RO16), under dark ambient conditions
at different pH values (3, 6.5, 9.5 and 11) and temperature of 20 °C. The best
catalytic efficiency in the degradation of RO16 dye showed the sample with x(Nb) =
0.010 in acidic solution, where the residual of RO16 dye was about 4.5 % after 330
minutes. The reusability test for this powder in degradation process of RO16 dye
showed that the sample with x(Nb) = 0.010 retained its catalytic activity during three
cycles.
1. W. Zhong et al., Appl. Catal. A, Gen., 549 (2018) 302.",
publisher = "University of Belgrade, Institute for Multidisciplinary Research",
journal = "6th Conference of the Serbian Society for Ceramic Materials, 6CSCS-2022, June 28-29, 2022, Belgrade, Serbia",
title = "The catalytic degradation of RO16 dye under dark ambient conditions using La-Ni-Nb-O-based powders",
pages = "63",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2031"
}

Počuča-Nešić, M., Vukašinović, J., Dapčević, A., Ribić, V., Branković, Z., Vojisavljević, K., Marinković Stanojević, Z.,& Branković, G.. (2022). The catalytic degradation of RO16 dye under dark ambient conditions using La-Ni-Nb-O-based powders. in 6th Conference of the Serbian Society for Ceramic Materials, 6CSCS-2022, June 28-29, 2022, Belgrade, Serbia
University of Belgrade, Institute for Multidisciplinary Research., 63.
https://hdl.handle.net/21.15107/rcub_rimsi_2031

Počuča-Nešić M, Vukašinović J, Dapčević A, Ribić V, Branković Z, Vojisavljević K, Marinković Stanojević Z, Branković G. The catalytic degradation of RO16 dye under dark ambient conditions using La-Ni-Nb-O-based powders. in 6th Conference of the Serbian Society for Ceramic Materials, 6CSCS-2022, June 28-29, 2022, Belgrade, Serbia. 2022;:63.
https://hdl.handle.net/21.15107/rcub_rimsi_2031 .

Počuča-Nešić, Milica, Vukašinović, Jelena, Dapčević, Aleksandra, Ribić, Vesna, Branković, Zorica, Vojisavljević, Katarina, Marinković Stanojević, Zorica, Branković, Goran, "The catalytic degradation of RO16 dye under dark ambient conditions using La-Ni-Nb-O-based powders" in 6th Conference of the Serbian Society for Ceramic Materials, 6CSCS-2022, June 28-29, 2022, Belgrade, Serbia (2022):63,
https://hdl.handle.net/21.15107/rcub_rimsi_2031 .

TY  - CONF
AU  - Vojisavljević, Katarina
AU  - Vukašinović, Jelena
AU  - Počuča-Nešić, Milica
AU  - Savic, Slavica
AU  - Podlogar, Matejka
AU  - Zemljak, Olivera
AU  - Branković, Zorica
PY  - 2022
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2038
AB  - Hierarchical nanostructures with multiporous tin oxide nanofibers (SnO2-
MPNFs) and zinc oxide nanorods (ZnO-NRs) have been synthesized by combining
electrospinning technique and hydrothermal method. A solution containing
uniformly distributed tin (Sn) and silicon (Si) species of precursors, as well as a
sacrificial polymer (PVP) was electrospun using a single-nozzle spinneret to
fabricate nanofibers. In virtue of the Kirkendall effect driven by calcination at
550 °C, the SiO2-cored SnO2 nanofibers (SnO2-SiO2-NFs) deliberated from PVP
were formed and used as backbones for further hydrothermal growth of ZnO-NRs.
By varying the hydrothermal reaction time (0.5–2 h) at the constant concentration of
SnO2-SiO2-NFs, zinc (Zn) precursor, directing agent (hexamethylenetetramine,
HMT) and aqueous ammonia, the density, length and thickness of ZnO-NRs were
controlled. Nanofibers and ZnO-NRs/SnO2-MPNFs heterostructures are confirmed
by X-ray diffraction (XRD), field-emission scanning electron microcopy (FE-SEM),
energy dispersive spectrometer (EDS), transmission electron microscopy (TEM) and
elemental mapping analysis. 
The hydrothermal treatment conducted at 90 °C in aqueous ammonia allowed:
a) selective etching of SiO2 from the SnO2-SiO2-NFs core and SiO2 trapped between
SnO2 particles, and b) effective growth of ZnO-NRs. The process resulted in
ZnO-NRs/SnO2-MPNFs heterostructures with ZnO-NRs of 1–5 μm in length
attached to SnO2-MPNFs, the shell of which was composed of ultra-fine SnO2
crystallites (~5 nm in size) and where the four porous channels create the core
instead of SiO2. Photocatalytic performance of the heterostructures was investigated
toward different organic azo-dyes (methylene blue, methyl orange) and obvious
enhancement was demonstrated in degradation of the organic pollutant, compared to
primary SnO2-based nanofibers.
PB  - University of Belgrade, Institute for Multidisciplinary Research
C3  - 6th Conference of the Serbian Society for Ceramic Materials, 6CSCS-2022, June 28-29, 2022, Belgrade, Serbia
T1  - Hierarchical ZnO/SnO2 heterostructures via hydrothermally assisted electrospinning technique: synthesis and photocatalytic performances
SP  - 51
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2038
ER  - 

@conference{
author = "Vojisavljević, Katarina and Vukašinović, Jelena and Počuča-Nešić, Milica and Savic, Slavica and Podlogar, Matejka and Zemljak, Olivera and Branković, Zorica",
year = "2022",
abstract = "Hierarchical nanostructures with multiporous tin oxide nanofibers (SnO2-
MPNFs) and zinc oxide nanorods (ZnO-NRs) have been synthesized by combining
electrospinning technique and hydrothermal method. A solution containing
uniformly distributed tin (Sn) and silicon (Si) species of precursors, as well as a
sacrificial polymer (PVP) was electrospun using a single-nozzle spinneret to
fabricate nanofibers. In virtue of the Kirkendall effect driven by calcination at
550 °C, the SiO2-cored SnO2 nanofibers (SnO2-SiO2-NFs) deliberated from PVP
were formed and used as backbones for further hydrothermal growth of ZnO-NRs.
By varying the hydrothermal reaction time (0.5–2 h) at the constant concentration of
SnO2-SiO2-NFs, zinc (Zn) precursor, directing agent (hexamethylenetetramine,
HMT) and aqueous ammonia, the density, length and thickness of ZnO-NRs were
controlled. Nanofibers and ZnO-NRs/SnO2-MPNFs heterostructures are confirmed
by X-ray diffraction (XRD), field-emission scanning electron microcopy (FE-SEM),
energy dispersive spectrometer (EDS), transmission electron microscopy (TEM) and
elemental mapping analysis. 
The hydrothermal treatment conducted at 90 °C in aqueous ammonia allowed:
a) selective etching of SiO2 from the SnO2-SiO2-NFs core and SiO2 trapped between
SnO2 particles, and b) effective growth of ZnO-NRs. The process resulted in
ZnO-NRs/SnO2-MPNFs heterostructures with ZnO-NRs of 1–5 μm in length
attached to SnO2-MPNFs, the shell of which was composed of ultra-fine SnO2
crystallites (~5 nm in size) and where the four porous channels create the core
instead of SiO2. Photocatalytic performance of the heterostructures was investigated
toward different organic azo-dyes (methylene blue, methyl orange) and obvious
enhancement was demonstrated in degradation of the organic pollutant, compared to
primary SnO2-based nanofibers.",
publisher = "University of Belgrade, Institute for Multidisciplinary Research",
journal = "6th Conference of the Serbian Society for Ceramic Materials, 6CSCS-2022, June 28-29, 2022, Belgrade, Serbia",
title = "Hierarchical ZnO/SnO2 heterostructures via hydrothermally assisted electrospinning technique: synthesis and photocatalytic performances",
pages = "51",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2038"
}

Vojisavljević, K., Vukašinović, J., Počuča-Nešić, M., Savic, S., Podlogar, M., Zemljak, O.,& Branković, Z.. (2022). Hierarchical ZnO/SnO2 heterostructures via hydrothermally assisted electrospinning technique: synthesis and photocatalytic performances. in 6th Conference of the Serbian Society for Ceramic Materials, 6CSCS-2022, June 28-29, 2022, Belgrade, Serbia
University of Belgrade, Institute for Multidisciplinary Research., 51.
https://hdl.handle.net/21.15107/rcub_rimsi_2038

Vojisavljević K, Vukašinović J, Počuča-Nešić M, Savic S, Podlogar M, Zemljak O, Branković Z. Hierarchical ZnO/SnO2 heterostructures via hydrothermally assisted electrospinning technique: synthesis and photocatalytic performances. in 6th Conference of the Serbian Society for Ceramic Materials, 6CSCS-2022, June 28-29, 2022, Belgrade, Serbia. 2022;:51.
https://hdl.handle.net/21.15107/rcub_rimsi_2038 .

Vojisavljević, Katarina, Vukašinović, Jelena, Počuča-Nešić, Milica, Savic, Slavica, Podlogar, Matejka, Zemljak, Olivera, Branković, Zorica, "Hierarchical ZnO/SnO2 heterostructures via hydrothermally assisted electrospinning technique: synthesis and photocatalytic performances" in 6th Conference of the Serbian Society for Ceramic Materials, 6CSCS-2022, June 28-29, 2022, Belgrade, Serbia (2022):51,
https://hdl.handle.net/21.15107/rcub_rimsi_2038 .

TY  - CONF
AU  - Vukašinović, Jelena
AU  - Rapljenović, Željko
AU  - Počuča-Nešić, Milica
AU  - Ivek, Tomislav
AU  - Peter, Robert
AU  - Branković, Zorica
AU  - Zemljak, Olivera
AU  - Branković, Goran
PY  - 2022
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2025
AB  - Barium stannate, BaSnO3 (BSO), is a perovskite-type alkaline earth metal
stannate with almost ideal cubic structure. Appropriate doping can alter this wide
band gap material’s electrical characteristics and change it either into a proton
conductor or n-type semiconductor. In the case of Sb doping on Sn site, BSO
becomes n-type semiconductor with high electrical conductivity at 25 °C.
The major drawback of BSO-based ceramics is its low density. The
conventional solid state procedure requires long thermal treatments with several
intermittent grinding and heating steps at temperatures up to 1600 °C [1].
To overcome this problem, we used Spark Plasma Sintering technique (SPS) for
the preparation of BaSn1-xSbxO3, (x = 0.00 (BSSO0) and 0.08 (BSSO8)) ceramic
samples. The samples structural properties were investigated using XRD (X-Ray
Powder Diffraction), XPS (X-Ray Photoelectron Spectrophotmetry) and SIMS
(Secondary Ion Mass Spectrometry) analyses. XPS analysis revealed the existence
of many structural defects, including mixed oxidation states of tin (Sn2+/Sn4+) and
oxygen vacancies (VO) in both BSSO samples.
The electrical properties of the BSSO ceramic samples were investigated in the
temperature range of 4–300 K. The presence of oxygen vacancies in the BSSO0
sample led to the absence of the standard activated semiconductor behavior,
showing almost linear temperature-dependent resistivity in the examined
temperature range. On the other hand, the BSSO8 sample showed almost temperature-independent resistivity in the range of 70–300 K. This could be a
consequence of the presence of many structural defects such as mixed oxidation
states of Sn2+/Sn4+, probably Sb3+/Sb5+ and significant amount of O- species, as well
as the presence of the low angle grain boundaries found in this sample. The BSSO8
ceramic sample could satisfy the huge demand for the linear resistors with moderate
and high conductivity, due to its low and almost constant electrical resistivity in the
wide temperature.
1. A.-M. Azad, L.L.W. Shyan, T.Y. Pang, C.H. Nee, Ceram. Int., 26 (2000) 685.
PB  - University of Belgrade, Institute for Multidisciplinary Research
C3  - 6th Conference of the Serbian Society for Ceramic Materials, 6CSCS-2022, June 28-29, 2022, Belgrade, Serbia
T1  - The defect structure and electrical properties of the spark plasma sintered antimony-doped barium stannate
EP  - 76
SP  - 75
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2025
ER  - 

@conference{
author = "Vukašinović, Jelena and Rapljenović, Željko and Počuča-Nešić, Milica and Ivek, Tomislav and Peter, Robert and Branković, Zorica and Zemljak, Olivera and Branković, Goran",
year = "2022",
abstract = "Barium stannate, BaSnO3 (BSO), is a perovskite-type alkaline earth metal
stannate with almost ideal cubic structure. Appropriate doping can alter this wide
band gap material’s electrical characteristics and change it either into a proton
conductor or n-type semiconductor. In the case of Sb doping on Sn site, BSO
becomes n-type semiconductor with high electrical conductivity at 25 °C.
The major drawback of BSO-based ceramics is its low density. The
conventional solid state procedure requires long thermal treatments with several
intermittent grinding and heating steps at temperatures up to 1600 °C [1].
To overcome this problem, we used Spark Plasma Sintering technique (SPS) for
the preparation of BaSn1-xSbxO3, (x = 0.00 (BSSO0) and 0.08 (BSSO8)) ceramic
samples. The samples structural properties were investigated using XRD (X-Ray
Powder Diffraction), XPS (X-Ray Photoelectron Spectrophotmetry) and SIMS
(Secondary Ion Mass Spectrometry) analyses. XPS analysis revealed the existence
of many structural defects, including mixed oxidation states of tin (Sn2+/Sn4+) and
oxygen vacancies (VO) in both BSSO samples.
The electrical properties of the BSSO ceramic samples were investigated in the
temperature range of 4–300 K. The presence of oxygen vacancies in the BSSO0
sample led to the absence of the standard activated semiconductor behavior,
showing almost linear temperature-dependent resistivity in the examined
temperature range. On the other hand, the BSSO8 sample showed almost temperature-independent resistivity in the range of 70–300 K. This could be a
consequence of the presence of many structural defects such as mixed oxidation
states of Sn2+/Sn4+, probably Sb3+/Sb5+ and significant amount of O- species, as well
as the presence of the low angle grain boundaries found in this sample. The BSSO8
ceramic sample could satisfy the huge demand for the linear resistors with moderate
and high conductivity, due to its low and almost constant electrical resistivity in the
wide temperature.
1. A.-M. Azad, L.L.W. Shyan, T.Y. Pang, C.H. Nee, Ceram. Int., 26 (2000) 685.",
publisher = "University of Belgrade, Institute for Multidisciplinary Research",
journal = "6th Conference of the Serbian Society for Ceramic Materials, 6CSCS-2022, June 28-29, 2022, Belgrade, Serbia",
title = "The defect structure and electrical properties of the spark plasma sintered antimony-doped barium stannate",
pages = "76-75",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2025"
}

Vukašinović, J., Rapljenović, Ž., Počuča-Nešić, M., Ivek, T., Peter, R., Branković, Z., Zemljak, O.,& Branković, G.. (2022). The defect structure and electrical properties of the spark plasma sintered antimony-doped barium stannate. in 6th Conference of the Serbian Society for Ceramic Materials, 6CSCS-2022, June 28-29, 2022, Belgrade, Serbia
University of Belgrade, Institute for Multidisciplinary Research., 75-76.
https://hdl.handle.net/21.15107/rcub_rimsi_2025

Vukašinović J, Rapljenović Ž, Počuča-Nešić M, Ivek T, Peter R, Branković Z, Zemljak O, Branković G. The defect structure and electrical properties of the spark plasma sintered antimony-doped barium stannate. in 6th Conference of the Serbian Society for Ceramic Materials, 6CSCS-2022, June 28-29, 2022, Belgrade, Serbia. 2022;:75-76.
https://hdl.handle.net/21.15107/rcub_rimsi_2025 .

Vukašinović, Jelena, Rapljenović, Željko, Počuča-Nešić, Milica, Ivek, Tomislav, Peter, Robert, Branković, Zorica, Zemljak, Olivera, Branković, Goran, "The defect structure and electrical properties of the spark plasma sintered antimony-doped barium stannate" in 6th Conference of the Serbian Society for Ceramic Materials, 6CSCS-2022, June 28-29, 2022, Belgrade, Serbia (2022):75-76,
https://hdl.handle.net/21.15107/rcub_rimsi_2025 .

TY  - CONF
AU  - Vukašinović, Jelena
AU  - Počuča-Nešić, Milica
AU  - Malešević, Aleksandar
AU  - Ribić, Vesna
AU  - Drev, Sandra
AU  - Rečnik, Aleksander
AU  - Bernik, Slavko
AU  - Podlogar, Matejka
AU  - Branković, Goran
PY  - 2022
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2026
AB  - Barium stannate, BaSnO3 (BSO), a cubic perovskite-type oxide with its
interesting structural, optical and electrical properties has wide application as an
electrode material, thermally stable capacitor, transparent conductive oxide,
photocatalyst, humidity and gas sensor material [1]. Partial substitution of Sn by Sb
in BSO leads to drastic changes primarily in its electrical properties, resulting in
metallic-like conductivity of doped ceramics. Major problems concerning the
synthesis of Sb doped BSO (BSSO) are connected to the phase composition and
density of final ceramic material.
This study covers the comprehensive investigation of structural, microstructural
and electrical properties of the Sb-doped BaSn1-xSbxO3 (x = 0.00, 0.04 and 0.08,
BSSO) ceramic materials obtained by two different sintering techniques:
conventional sintering (CS) and Spark Plasma sintering (SPS). The relative densities
of the BSSO-CS ceramic samples sintered at 1600 °C for 3 h was in the range of 79–
96 %. On the other side, the relative densities of BSSO-SPS ceramic samples in the
range of 86–96 % were obtained at 1200 °C, with sintering time of only 5 minutes.
The XRD analysis confirmed that cubic BaSnO3 is a major phase in all BSSO
samples. The presence of tetragonal Ba2SnO4 as a secondary phase was detected in
BSSO-SPS ceramic samples, with its content decreasing upon Sb-doping. As
expected, the grain size of the samples sintered at higher temperatures (BSSO-CS) is
larger in comparison with BSSO-SPS ceramic samples, which was confirmed by
Scanning Electron Microscopy (SEM). SEM analysis also revealed the layered
structure within the grains of BaSn0.92Sb0.08O3-CS sample while HRTEM analysis
confirmed the existence of the low angle grain boundaries (LAGBs) in the SPSed
sample with the same composition.
The electrical resistivity decreased upon Sb doping, and all doped BSSO
samples showed the linear I-U characteristic in the temperature range of 25–150 °C.
The semiconductor behavior of all BSSO-CS and BSSO-SPS (x = 0.00 and 0.04)
ceramic samples was confirmed through the existence of semicircles in their
impedance spectra. On the other hand, the BaSn0.92Sb0.08O3 sample showed the
metallic-like behavior resulting from the loss of the electrostatic barriers at LAGBs,
which is manifested through the absence of the semicircle in its impedance spectra.
PB  - University of Belgrade, Institute for Multidisciplinary Research
C3  - 6th Conference of the Serbian Society for Ceramic Materials, 6CSCS-2022, June 28-29, 2022, Belgrade, Serbia
T1  - Effect of the sintering technique on the properties of Sb-doped BaSnO3 ceramics
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2026
ER  - 

@conference{
author = "Vukašinović, Jelena and Počuča-Nešić, Milica and Malešević, Aleksandar and Ribić, Vesna and Drev, Sandra and Rečnik, Aleksander and Bernik, Slavko and Podlogar, Matejka and Branković, Goran",
year = "2022",
abstract = "Barium stannate, BaSnO3 (BSO), a cubic perovskite-type oxide with its
interesting structural, optical and electrical properties has wide application as an
electrode material, thermally stable capacitor, transparent conductive oxide,
photocatalyst, humidity and gas sensor material [1]. Partial substitution of Sn by Sb
in BSO leads to drastic changes primarily in its electrical properties, resulting in
metallic-like conductivity of doped ceramics. Major problems concerning the
synthesis of Sb doped BSO (BSSO) are connected to the phase composition and
density of final ceramic material.
This study covers the comprehensive investigation of structural, microstructural
and electrical properties of the Sb-doped BaSn1-xSbxO3 (x = 0.00, 0.04 and 0.08,
BSSO) ceramic materials obtained by two different sintering techniques:
conventional sintering (CS) and Spark Plasma sintering (SPS). The relative densities
of the BSSO-CS ceramic samples sintered at 1600 °C for 3 h was in the range of 79–
96 %. On the other side, the relative densities of BSSO-SPS ceramic samples in the
range of 86–96 % were obtained at 1200 °C, with sintering time of only 5 minutes.
The XRD analysis confirmed that cubic BaSnO3 is a major phase in all BSSO
samples. The presence of tetragonal Ba2SnO4 as a secondary phase was detected in
BSSO-SPS ceramic samples, with its content decreasing upon Sb-doping. As
expected, the grain size of the samples sintered at higher temperatures (BSSO-CS) is
larger in comparison with BSSO-SPS ceramic samples, which was confirmed by
Scanning Electron Microscopy (SEM). SEM analysis also revealed the layered
structure within the grains of BaSn0.92Sb0.08O3-CS sample while HRTEM analysis
confirmed the existence of the low angle grain boundaries (LAGBs) in the SPSed
sample with the same composition.
The electrical resistivity decreased upon Sb doping, and all doped BSSO
samples showed the linear I-U characteristic in the temperature range of 25–150 °C.
The semiconductor behavior of all BSSO-CS and BSSO-SPS (x = 0.00 and 0.04)
ceramic samples was confirmed through the existence of semicircles in their
impedance spectra. On the other hand, the BaSn0.92Sb0.08O3 sample showed the
metallic-like behavior resulting from the loss of the electrostatic barriers at LAGBs,
which is manifested through the absence of the semicircle in its impedance spectra.",
publisher = "University of Belgrade, Institute for Multidisciplinary Research",
journal = "6th Conference of the Serbian Society for Ceramic Materials, 6CSCS-2022, June 28-29, 2022, Belgrade, Serbia",
title = "Effect of the sintering technique on the properties of Sb-doped BaSnO3 ceramics",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2026"
}

Vukašinović, J., Počuča-Nešić, M., Malešević, A., Ribić, V., Drev, S., Rečnik, A., Bernik, S., Podlogar, M.,& Branković, G.. (2022). Effect of the sintering technique on the properties of Sb-doped BaSnO3 ceramics. in 6th Conference of the Serbian Society for Ceramic Materials, 6CSCS-2022, June 28-29, 2022, Belgrade, Serbia
University of Belgrade, Institute for Multidisciplinary Research..
https://hdl.handle.net/21.15107/rcub_rimsi_2026

Vukašinović J, Počuča-Nešić M, Malešević A, Ribić V, Drev S, Rečnik A, Bernik S, Podlogar M, Branković G. Effect of the sintering technique on the properties of Sb-doped BaSnO3 ceramics. in 6th Conference of the Serbian Society for Ceramic Materials, 6CSCS-2022, June 28-29, 2022, Belgrade, Serbia. 2022;.
https://hdl.handle.net/21.15107/rcub_rimsi_2026 .

Vukašinović, Jelena, Počuča-Nešić, Milica, Malešević, Aleksandar, Ribić, Vesna, Drev, Sandra, Rečnik, Aleksander, Bernik, Slavko, Podlogar, Matejka, Branković, Goran, "Effect of the sintering technique on the properties of Sb-doped BaSnO3 ceramics" in 6th Conference of the Serbian Society for Ceramic Materials, 6CSCS-2022, June 28-29, 2022, Belgrade, Serbia (2022),
https://hdl.handle.net/21.15107/rcub_rimsi_2026 .

TY  - GEN
AU  - Počuča-Nešić, Milica
AU  - Vukašinović, Jelena
AU  - Branković, Goran
PY  - 2021
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2078
AB  - Multiferroic materials simultaneously host at least two primary ferroic orders (ferroelectricity, ferromagnetism, or ferroelasticity) in the same phase [1]. The possibility to control ferroelectric properties via magnetic field, or the control of magnetic properties by applied electric field, makes these systems particularly interesting for high-tech application. Multiferroics can be used to manufacture multifunctional microelectronic or microwave devices, ferroelectric memory components, magnetic data storage, etc.
YMnO3 is a multiferroic compound which appears in two crystal modifications, the hexagonal thermically stable form and the rhombic metastabile crystal structure. The goal of our research is to obtain multiferroic YMnO3 which would simultaneously show ferroelectric and antiferromagnetic properties. With this in mind, we compared two methods of synthesis: mechanochemical as well as chemical synthesis from citrate polymer precursors. Our results show that chemical synthesis yields powders which, apart from h-YMnO3 and o-YmnO3, also contain YMn2O5 as a secondary phase. However, conventional sintering of these powders at 1400 °C during 2 h produces h-ordered YMnO3 which is simultaneously ferroelectric as well as antiferromagnetically.
T2  - Advanced electronic materials in fundamental research and applications, workshop, 9th December, 2021, Zagreb, Croatia
T1  - Mechanochemical and chemical synthesis of multiferroic yttrium manganite
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2078
ER  - 

@misc{
author = "Počuča-Nešić, Milica and Vukašinović, Jelena and Branković, Goran",
year = "2021",
abstract = "Multiferroic materials simultaneously host at least two primary ferroic orders (ferroelectricity, ferromagnetism, or ferroelasticity) in the same phase [1]. The possibility to control ferroelectric properties via magnetic field, or the control of magnetic properties by applied electric field, makes these systems particularly interesting for high-tech application. Multiferroics can be used to manufacture multifunctional microelectronic or microwave devices, ferroelectric memory components, magnetic data storage, etc.
YMnO3 is a multiferroic compound which appears in two crystal modifications, the hexagonal thermically stable form and the rhombic metastabile crystal structure. The goal of our research is to obtain multiferroic YMnO3 which would simultaneously show ferroelectric and antiferromagnetic properties. With this in mind, we compared two methods of synthesis: mechanochemical as well as chemical synthesis from citrate polymer precursors. Our results show that chemical synthesis yields powders which, apart from h-YMnO3 and o-YmnO3, also contain YMn2O5 as a secondary phase. However, conventional sintering of these powders at 1400 °C during 2 h produces h-ordered YMnO3 which is simultaneously ferroelectric as well as antiferromagnetically.",
journal = "Advanced electronic materials in fundamental research and applications, workshop, 9th December, 2021, Zagreb, Croatia",
title = "Mechanochemical and chemical synthesis of multiferroic yttrium manganite",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2078"
}

Počuča-Nešić, M., Vukašinović, J.,& Branković, G.. (2021). Mechanochemical and chemical synthesis of multiferroic yttrium manganite. in Advanced electronic materials in fundamental research and applications, workshop, 9th December, 2021, Zagreb, Croatia.
https://hdl.handle.net/21.15107/rcub_rimsi_2078

Počuča-Nešić M, Vukašinović J, Branković G. Mechanochemical and chemical synthesis of multiferroic yttrium manganite. in Advanced electronic materials in fundamental research and applications, workshop, 9th December, 2021, Zagreb, Croatia. 2021;.
https://hdl.handle.net/21.15107/rcub_rimsi_2078 .

Počuča-Nešić, Milica, Vukašinović, Jelena, Branković, Goran, "Mechanochemical and chemical synthesis of multiferroic yttrium manganite" in Advanced electronic materials in fundamental research and applications, workshop, 9th December, 2021, Zagreb, Croatia (2021),
https://hdl.handle.net/21.15107/rcub_rimsi_2078 .

TY  - JOUR
AU  - Mitrović, Jelena
AU  - Počuča-Nešić, Milica
AU  - Luković Golić, Danijela
AU  - Ribić, Vesna
AU  - Branković, Zorica
AU  - Savić, Slavica M.
AU  - Dapčević, Aleksandra
AU  - Bernik, Slavko
AU  - Podlogar, Matejka
AU  - Kocen, Matej
AU  - Rapljenović, Zeljko
AU  - Ivek, Tomislav
AU  - Lazović, Vladimir
AU  - Dojčinović, Biljana
AU  - Branković, Goran
PY  - 2020
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/1363
AB  - Antimony doped barium-stannate dense ceramic materials were synthesized using spark plasma sintering technique out of mechanically activated precursor powders. The influence of various Sb concentrations (x = 0.00 - 0.10) on properties of BaSn1-xSbxO3 ceramics was investigated. Relative densities of prepared samples were in the range of (79-96) %. TEM analysis revealed the presence of many dislocations in undoped BaSnO3, and their significant reduction upon doping with Sb. All samples except BaSn0.92Sb0.08O3 exhibit non-linear I-U characteristic, typical for semiconductors with potential barrier at grain boundaries. Low angle grain boundaries found only in BaSn0.92Sb0.08O3 caused the loss of potential barrier at grain boundaries which was confirmed by AC impedance spectroscopy measurements. Consequently, BaSn0.92Sb0.08O3 showed the lowest electrical resistivity and linear I-U characteristic. UV-vis analysis confirmed the increasing of band gap (Burstein-Moss shift) values in all doped samples.
PB  - Elsevier Sci Ltd, Oxford
T2  - Journal of the European Ceramic Society
T1  - The structural, electrical and optical properties of spark plasma sintered BaSn1-xSbxO3 ceramics
EP  - 5575
IS  - 15
SP  - 5566
VL  - 40
DO  - 10.1016/j.jeurceramsoc.2020.06.062
ER  - 

@article{
author = "Mitrović, Jelena and Počuča-Nešić, Milica and Luković Golić, Danijela and Ribić, Vesna and Branković, Zorica and Savić, Slavica M. and Dapčević, Aleksandra and Bernik, Slavko and Podlogar, Matejka and Kocen, Matej and Rapljenović, Zeljko and Ivek, Tomislav and Lazović, Vladimir and Dojčinović, Biljana and Branković, Goran",
year = "2020",
abstract = "Antimony doped barium-stannate dense ceramic materials were synthesized using spark plasma sintering technique out of mechanically activated precursor powders. The influence of various Sb concentrations (x = 0.00 - 0.10) on properties of BaSn1-xSbxO3 ceramics was investigated. Relative densities of prepared samples were in the range of (79-96) %. TEM analysis revealed the presence of many dislocations in undoped BaSnO3, and their significant reduction upon doping with Sb. All samples except BaSn0.92Sb0.08O3 exhibit non-linear I-U characteristic, typical for semiconductors with potential barrier at grain boundaries. Low angle grain boundaries found only in BaSn0.92Sb0.08O3 caused the loss of potential barrier at grain boundaries which was confirmed by AC impedance spectroscopy measurements. Consequently, BaSn0.92Sb0.08O3 showed the lowest electrical resistivity and linear I-U characteristic. UV-vis analysis confirmed the increasing of band gap (Burstein-Moss shift) values in all doped samples.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Journal of the European Ceramic Society",
title = "The structural, electrical and optical properties of spark plasma sintered BaSn1-xSbxO3 ceramics",
pages = "5575-5566",
number = "15",
volume = "40",
doi = "10.1016/j.jeurceramsoc.2020.06.062"
}

Mitrović, J., Počuča-Nešić, M., Luković Golić, D., Ribić, V., Branković, Z., Savić, S. M., Dapčević, A., Bernik, S., Podlogar, M., Kocen, M., Rapljenović, Z., Ivek, T., Lazović, V., Dojčinović, B.,& Branković, G.. (2020). The structural, electrical and optical properties of spark plasma sintered BaSn1-xSbxO3 ceramics. in Journal of the European Ceramic Society
Elsevier Sci Ltd, Oxford., 40(15), 5566-5575.
https://doi.org/10.1016/j.jeurceramsoc.2020.06.062

Mitrović J, Počuča-Nešić M, Luković Golić D, Ribić V, Branković Z, Savić SM, Dapčević A, Bernik S, Podlogar M, Kocen M, Rapljenović Z, Ivek T, Lazović V, Dojčinović B, Branković G. The structural, electrical and optical properties of spark plasma sintered BaSn1-xSbxO3 ceramics. in Journal of the European Ceramic Society. 2020;40(15):5566-5575.
doi:10.1016/j.jeurceramsoc.2020.06.062 .

Mitrović, Jelena, Počuča-Nešić, Milica, Luković Golić, Danijela, Ribić, Vesna, Branković, Zorica, Savić, Slavica M., Dapčević, Aleksandra, Bernik, Slavko, Podlogar, Matejka, Kocen, Matej, Rapljenović, Zeljko, Ivek, Tomislav, Lazović, Vladimir, Dojčinović, Biljana, Branković, Goran, "The structural, electrical and optical properties of spark plasma sintered BaSn1-xSbxO3 ceramics" in Journal of the European Ceramic Society, 40, no. 15 (2020):5566-5575,
https://doi.org/10.1016/j.jeurceramsoc.2020.06.062 . .

TY  - CONF
AU  - Vukašinović, Jelena
AU  - Počuča-Nešić, Milica
AU  - Luković Golić, Danijela
AU  - Ribić, Vesna
AU  - Branković, Zorica
AU  - Dapčević, Aleksandra
AU  - Bernik, Slavko
AU  - Branković, Goran
PY  - 2019
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2071
AB  - BaSnO3 (BSO) belongs to the perovskite-type oxides with a cubic crystal structure. It
exhibits interesting electrical, optical and photocatalytic properties. BSO has a potential
application as transparent conductor, gas sensor, photocatalyst or dielectric capacitor. It is
an insulating material with wide band gap (Eg = 3.1–3.4 eV), but its electrical properties
can be adjusted by doping with aliovalent cations.
In this work, we investigated the influence of antimony (Sb3+), as a dopant, on crystal
structure, microstructural and electrical properties of BSO ceramics. Stoichiometric
mixture of powders BaCO3, SnO2 and Sb2O3 was mechanochemically activated in a
planetary ball mill and afterwards calcined at 900 ºC for 4 h. As-prepared powders were
sintered by spark plasma sintering technique (1200 ºC for 5 min) in order to produce
ceramic samples BaSn1-xSbxO3 (x = 0.00, 0.04, 0.06, 0.08 and 0.10). All samples were
characterized using X-ray Diffraction (XRD) analysis, High Resolution Transmission
(HRTEM) and Field Emission Electron Microscopy (FESEM). Electrical conductivity of
BaSn1-xSbxO3 ceramics was determined by measuring of the current-voltage (I–U)
characteristics in different mediums and at different temperatures.
XRD analysis confirmed the existence of cubic BSO, as a dominant phase, and
tetragonal Ba2SnO4, as a secondary phase. FESEM analysis revealed homogenous
microstructure in all samples and noticeable decrease of the grain size in doped samples
compared to BSO. HRTEM micrographs of the undoped sample showed less ordered
microstructure with amorphous phase in the grain boundary region. Doped samples
revealed much higher crystallinity, especially in the grain boundary regions without
presence of defects. Low angle grain boundaries (LAGB) are observed (the angle equals
2.08°) on the HRTEM micrographs of BaSn0.92Sb0.08O3. It was observed that all doped
samples are n-type semiconductors, having linear I–U characteristics up to 150 °C.
Sample BaSn0.92Sb0.08O3 showed the highest conductivity, most likely due to the presence
of the LAGB, which allow easier charge carrier transfer between grains and greater
carrier mobility [1].
[1] Y. Furushima, A. Nakamura, E. Tochigi, Y. Ikuhara, K. Toyoura, K. Matsunaga, J.
Appl. Phys., 120 (2016) 1421071–1421079.
PB  - Serbian Crystallographic Society
C3  - 26th Conference of the Serbian Crystallographic Society, June 27-28, 2019, Silver Lake, Serbia
T1  - Structural, microstructural and electrical properties of Sb-doped BaSnO3 ceramics
EP  - 73
SP  - 72
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2071
ER  - 

@conference{
author = "Vukašinović, Jelena and Počuča-Nešić, Milica and Luković Golić, Danijela and Ribić, Vesna and Branković, Zorica and Dapčević, Aleksandra and Bernik, Slavko and Branković, Goran",
year = "2019",
abstract = "BaSnO3 (BSO) belongs to the perovskite-type oxides with a cubic crystal structure. It
exhibits interesting electrical, optical and photocatalytic properties. BSO has a potential
application as transparent conductor, gas sensor, photocatalyst or dielectric capacitor. It is
an insulating material with wide band gap (Eg = 3.1–3.4 eV), but its electrical properties
can be adjusted by doping with aliovalent cations.
In this work, we investigated the influence of antimony (Sb3+), as a dopant, on crystal
structure, microstructural and electrical properties of BSO ceramics. Stoichiometric
mixture of powders BaCO3, SnO2 and Sb2O3 was mechanochemically activated in a
planetary ball mill and afterwards calcined at 900 ºC for 4 h. As-prepared powders were
sintered by spark plasma sintering technique (1200 ºC for 5 min) in order to produce
ceramic samples BaSn1-xSbxO3 (x = 0.00, 0.04, 0.06, 0.08 and 0.10). All samples were
characterized using X-ray Diffraction (XRD) analysis, High Resolution Transmission
(HRTEM) and Field Emission Electron Microscopy (FESEM). Electrical conductivity of
BaSn1-xSbxO3 ceramics was determined by measuring of the current-voltage (I–U)
characteristics in different mediums and at different temperatures.
XRD analysis confirmed the existence of cubic BSO, as a dominant phase, and
tetragonal Ba2SnO4, as a secondary phase. FESEM analysis revealed homogenous
microstructure in all samples and noticeable decrease of the grain size in doped samples
compared to BSO. HRTEM micrographs of the undoped sample showed less ordered
microstructure with amorphous phase in the grain boundary region. Doped samples
revealed much higher crystallinity, especially in the grain boundary regions without
presence of defects. Low angle grain boundaries (LAGB) are observed (the angle equals
2.08°) on the HRTEM micrographs of BaSn0.92Sb0.08O3. It was observed that all doped
samples are n-type semiconductors, having linear I–U characteristics up to 150 °C.
Sample BaSn0.92Sb0.08O3 showed the highest conductivity, most likely due to the presence
of the LAGB, which allow easier charge carrier transfer between grains and greater
carrier mobility [1].
[1] Y. Furushima, A. Nakamura, E. Tochigi, Y. Ikuhara, K. Toyoura, K. Matsunaga, J.
Appl. Phys., 120 (2016) 1421071–1421079.",
publisher = "Serbian Crystallographic Society",
journal = "26th Conference of the Serbian Crystallographic Society, June 27-28, 2019, Silver Lake, Serbia",
title = "Structural, microstructural and electrical properties of Sb-doped BaSnO3 ceramics",
pages = "73-72",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2071"
}

Vukašinović, J., Počuča-Nešić, M., Luković Golić, D., Ribić, V., Branković, Z., Dapčević, A., Bernik, S.,& Branković, G.. (2019). Structural, microstructural and electrical properties of Sb-doped BaSnO3 ceramics. in 26th Conference of the Serbian Crystallographic Society, June 27-28, 2019, Silver Lake, Serbia
Serbian Crystallographic Society., 72-73.
https://hdl.handle.net/21.15107/rcub_rimsi_2071

Vukašinović J, Počuča-Nešić M, Luković Golić D, Ribić V, Branković Z, Dapčević A, Bernik S, Branković G. Structural, microstructural and electrical properties of Sb-doped BaSnO3 ceramics. in 26th Conference of the Serbian Crystallographic Society, June 27-28, 2019, Silver Lake, Serbia. 2019;:72-73.
https://hdl.handle.net/21.15107/rcub_rimsi_2071 .

Vukašinović, Jelena, Počuča-Nešić, Milica, Luković Golić, Danijela, Ribić, Vesna, Branković, Zorica, Dapčević, Aleksandra, Bernik, Slavko, Branković, Goran, "Structural, microstructural and electrical properties of Sb-doped BaSnO3 ceramics" in 26th Conference of the Serbian Crystallographic Society, June 27-28, 2019, Silver Lake, Serbia (2019):72-73,
https://hdl.handle.net/21.15107/rcub_rimsi_2071 .

TY  - CONF
AU  - Vukašinović, Jelena
AU  - Počuča-Nešić, Milica
AU  - Luković Golić, Danijela
AU  - Dapčević, Aleksandra
AU  - Kocen, Matej
AU  - Bernik, Slavko
AU  - Lazović, Vladimir
AU  - Branković, Zorica
AU  - Branković, Goran
PY  - 2019
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2037
AB  - Barium stannate, BaSnO3, belongs to the group of perovskite-type alkaline earth
stannates. It is an electrical insulator, but doping with proper cation can change its’
electrical properties and transform it into an n-type semiconductor.
In this work, we present the Sb-doped barium stannate, BaSn1-xSbxO3, x = 0.00,
0.04, 0.06, 0.08 and 0.10 (labelled as BSSOx100), using BaCO3, SnO2 and Sb2O5
as starting materials. Mechanically activated precursors were calcined at 900 °C for
4 h and subsequently sintered by Spark Plasma Sintering (SPS) Technique. For the
characterization of obtained ceramic samples various techniques were used: X-ray
Diffraction (XRD) analysis, High Resolution Transmission and Field Emission
electron microscopy (HRTEM and FESEM) and UV-Vis spectroscopy. Electrical
conductivity of BaSn1-xSbxO3 ceramic samples was determined by measuring the
current-voltage (I–U) characteristics in different mediums (air, silicon oil) at room
temperature and temperatures up to 150 °C.
XRD analysis confirmed the formation of the cubic BaSnO3 perovskite phase as
a major, and tetragonal Ba2SnO4 as a secondary phase. The content of Ba2SnO4
phase decreased with introducing of Sb into the BaSnO3 lattice. FESEM
micrographs of fractured BaSn1-xSbxO3 ceramic samples showed well-densified
microstructure and decrease of grain size with the increment of x. HRTEM analyses
revealed the existence of low angle grain boundary (LAGB), which provides low
energy conduction path of electrons. The results obtained from UV-Vis
spectroscopy, indicated the decrease of band gap value of BaSn1-xSbxO3 samples
with increasing Sb concentration. Electrical characterization confirmed that Sbdoped
BaSnO3 exhibits n-type conductivity. BaSn1-xSbxO3 samples with x = 0.04,
0.06, 0.08 showed linear I–U characteristics at temperatures up to 150 ºC. The
highest electrical conductivity was 1.96 S/cm for the BaSn0.92Sb0.08O3. The increase
of Sb concentration to x = 0.10 led to the loss of I–U characteristics' linearity.
PB  - University of Belgrade, Institute for Multidisciplinary Research
C3  - 5th Conference of the Serbian Society for Ceramic Materials, 5CSCS-2019, June 11-13, 2019, Belgrade
T1  - Spark plasma sintering of conductive Sb-doped BaSnO3
SP  - 136
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2037
ER  - 

@conference{
author = "Vukašinović, Jelena and Počuča-Nešić, Milica and Luković Golić, Danijela and Dapčević, Aleksandra and Kocen, Matej and Bernik, Slavko and Lazović, Vladimir and Branković, Zorica and Branković, Goran",
year = "2019",
abstract = "Barium stannate, BaSnO3, belongs to the group of perovskite-type alkaline earth
stannates. It is an electrical insulator, but doping with proper cation can change its’
electrical properties and transform it into an n-type semiconductor.
In this work, we present the Sb-doped barium stannate, BaSn1-xSbxO3, x = 0.00,
0.04, 0.06, 0.08 and 0.10 (labelled as BSSOx100), using BaCO3, SnO2 and Sb2O5
as starting materials. Mechanically activated precursors were calcined at 900 °C for
4 h and subsequently sintered by Spark Plasma Sintering (SPS) Technique. For the
characterization of obtained ceramic samples various techniques were used: X-ray
Diffraction (XRD) analysis, High Resolution Transmission and Field Emission
electron microscopy (HRTEM and FESEM) and UV-Vis spectroscopy. Electrical
conductivity of BaSn1-xSbxO3 ceramic samples was determined by measuring the
current-voltage (I–U) characteristics in different mediums (air, silicon oil) at room
temperature and temperatures up to 150 °C.
XRD analysis confirmed the formation of the cubic BaSnO3 perovskite phase as
a major, and tetragonal Ba2SnO4 as a secondary phase. The content of Ba2SnO4
phase decreased with introducing of Sb into the BaSnO3 lattice. FESEM
micrographs of fractured BaSn1-xSbxO3 ceramic samples showed well-densified
microstructure and decrease of grain size with the increment of x. HRTEM analyses
revealed the existence of low angle grain boundary (LAGB), which provides low
energy conduction path of electrons. The results obtained from UV-Vis
spectroscopy, indicated the decrease of band gap value of BaSn1-xSbxO3 samples
with increasing Sb concentration. Electrical characterization confirmed that Sbdoped
BaSnO3 exhibits n-type conductivity. BaSn1-xSbxO3 samples with x = 0.04,
0.06, 0.08 showed linear I–U characteristics at temperatures up to 150 ºC. The
highest electrical conductivity was 1.96 S/cm for the BaSn0.92Sb0.08O3. The increase
of Sb concentration to x = 0.10 led to the loss of I–U characteristics' linearity.",
publisher = "University of Belgrade, Institute for Multidisciplinary Research",
journal = "5th Conference of the Serbian Society for Ceramic Materials, 5CSCS-2019, June 11-13, 2019, Belgrade",
title = "Spark plasma sintering of conductive Sb-doped BaSnO3",
pages = "136",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2037"
}

Vukašinović, J., Počuča-Nešić, M., Luković Golić, D., Dapčević, A., Kocen, M., Bernik, S., Lazović, V., Branković, Z.,& Branković, G.. (2019). Spark plasma sintering of conductive Sb-doped BaSnO3. in 5th Conference of the Serbian Society for Ceramic Materials, 5CSCS-2019, June 11-13, 2019, Belgrade
University of Belgrade, Institute for Multidisciplinary Research., 136.
https://hdl.handle.net/21.15107/rcub_rimsi_2037

Vukašinović J, Počuča-Nešić M, Luković Golić D, Dapčević A, Kocen M, Bernik S, Lazović V, Branković Z, Branković G. Spark plasma sintering of conductive Sb-doped BaSnO3. in 5th Conference of the Serbian Society for Ceramic Materials, 5CSCS-2019, June 11-13, 2019, Belgrade. 2019;:136.
https://hdl.handle.net/21.15107/rcub_rimsi_2037 .

Vukašinović, Jelena, Počuča-Nešić, Milica, Luković Golić, Danijela, Dapčević, Aleksandra, Kocen, Matej, Bernik, Slavko, Lazović, Vladimir, Branković, Zorica, Branković, Goran, "Spark plasma sintering of conductive Sb-doped BaSnO3" in 5th Conference of the Serbian Society for Ceramic Materials, 5CSCS-2019, June 11-13, 2019, Belgrade (2019):136,
https://hdl.handle.net/21.15107/rcub_rimsi_2037 .

TY  - CONF
AU  - Vukašinović, Jelena
AU  - Počuča-Nešić, Milica
AU  - Dapčević, Aleksandra
AU  - Ribić, Vesna
AU  - Branković, Goran
AU  - Branković, Zorica
PY  - 2019
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2030
AB  - Lanthanum nickelate (LaNiO3, LNO) belongs to the group of materials with
perovskite-type structure and it crystallizes in rhombohedrally distorted perovskite
lattice. This material exhibits interesting electrical, magnetic, optical and catalytic
properties and it is suitable for various applications. Still, the preparation of single
phase LNO is difficult, because at temperatures above 850 °C it decomposes into the
lower oxides with formula Lan+1NinO3n+1 (n = 3, 2, 1) and NiO.
In this work we present the synthesis of pure and Nb doped LNO powders,
LaNi1-xNbxO3 (x = 0.000, 0.005, 0.010) prepared from mechanochemically activated
oxide precursors – La2O3, NiO and Nb2O5. For this experiment, precursor powders
homogenized in isopropyl alcohol were dried and mechanochemically activated in
the planetary ball mill for 3 h. As-prepared powders were calcined at 700 °C for 3 h
in air and further analyzed by X-ray diffraction analysis (XRD), Transmission
electron microscopy (TEM), Scanning electron microscopy (SEM) and UV-Vis
spectroscopy. Photocatalytic activity in visible light was investigated.
The XRD analysis of undoped LNO revealed the existence of rhombohedral
LaNiO3 and small amount of NiO phase. The doped samples, apart from LNO,
contained products of thermal decomposition – layered oxides and NiO. TEM and
HRTEM analyses of undoped LNO revealed the presence of agglomerated particles
with single particle size being in the range of 20–40 nm. Doping with Nb led to
decrease of agglomeration process and allowed better dispersion between particles
of LNO based powders. Calculated band gaps were 1.12 eV, 0.89 eV and 0.87 eV
for x = 0.00, 0.005, 0.010. The absorption spectra indicated photocatalytic
degradation of Reactive Orange 16, textile dye used as a model in these
experiments.
PB  - University of Belgrade, Institute for Multidisciplinary Research
C3  - 5th Conference of the Serbian Society for Ceramic Materials, 5CSCS-2019, June 11-13, 2019, Belgrade, Serbia
T1  - Synthesis, characterization and photocatalytic properties of LaNiO3-based powders
SP  - 72
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2030
ER  - 

@conference{
author = "Vukašinović, Jelena and Počuča-Nešić, Milica and Dapčević, Aleksandra and Ribić, Vesna and Branković, Goran and Branković, Zorica",
year = "2019",
abstract = "Lanthanum nickelate (LaNiO3, LNO) belongs to the group of materials with
perovskite-type structure and it crystallizes in rhombohedrally distorted perovskite
lattice. This material exhibits interesting electrical, magnetic, optical and catalytic
properties and it is suitable for various applications. Still, the preparation of single
phase LNO is difficult, because at temperatures above 850 °C it decomposes into the
lower oxides with formula Lan+1NinO3n+1 (n = 3, 2, 1) and NiO.
In this work we present the synthesis of pure and Nb doped LNO powders,
LaNi1-xNbxO3 (x = 0.000, 0.005, 0.010) prepared from mechanochemically activated
oxide precursors – La2O3, NiO and Nb2O5. For this experiment, precursor powders
homogenized in isopropyl alcohol were dried and mechanochemically activated in
the planetary ball mill for 3 h. As-prepared powders were calcined at 700 °C for 3 h
in air and further analyzed by X-ray diffraction analysis (XRD), Transmission
electron microscopy (TEM), Scanning electron microscopy (SEM) and UV-Vis
spectroscopy. Photocatalytic activity in visible light was investigated.
The XRD analysis of undoped LNO revealed the existence of rhombohedral
LaNiO3 and small amount of NiO phase. The doped samples, apart from LNO,
contained products of thermal decomposition – layered oxides and NiO. TEM and
HRTEM analyses of undoped LNO revealed the presence of agglomerated particles
with single particle size being in the range of 20–40 nm. Doping with Nb led to
decrease of agglomeration process and allowed better dispersion between particles
of LNO based powders. Calculated band gaps were 1.12 eV, 0.89 eV and 0.87 eV
for x = 0.00, 0.005, 0.010. The absorption spectra indicated photocatalytic
degradation of Reactive Orange 16, textile dye used as a model in these
experiments.",
publisher = "University of Belgrade, Institute for Multidisciplinary Research",
journal = "5th Conference of the Serbian Society for Ceramic Materials, 5CSCS-2019, June 11-13, 2019, Belgrade, Serbia",
title = "Synthesis, characterization and photocatalytic properties of LaNiO3-based powders",
pages = "72",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2030"
}

Vukašinović, J., Počuča-Nešić, M., Dapčević, A., Ribić, V., Branković, G.,& Branković, Z.. (2019). Synthesis, characterization and photocatalytic properties of LaNiO3-based powders. in 5th Conference of the Serbian Society for Ceramic Materials, 5CSCS-2019, June 11-13, 2019, Belgrade, Serbia
University of Belgrade, Institute for Multidisciplinary Research., 72.
https://hdl.handle.net/21.15107/rcub_rimsi_2030

Vukašinović J, Počuča-Nešić M, Dapčević A, Ribić V, Branković G, Branković Z. Synthesis, characterization and photocatalytic properties of LaNiO3-based powders. in 5th Conference of the Serbian Society for Ceramic Materials, 5CSCS-2019, June 11-13, 2019, Belgrade, Serbia. 2019;:72.
https://hdl.handle.net/21.15107/rcub_rimsi_2030 .

Vukašinović, Jelena, Počuča-Nešić, Milica, Dapčević, Aleksandra, Ribić, Vesna, Branković, Goran, Branković, Zorica, "Synthesis, characterization and photocatalytic properties of LaNiO3-based powders" in 5th Conference of the Serbian Society for Ceramic Materials, 5CSCS-2019, June 11-13, 2019, Belgrade, Serbia (2019):72,
https://hdl.handle.net/21.15107/rcub_rimsi_2030 .

TY  - CONF
AU  - Luković Golić, Danijela
AU  - Vukašinović, Jelena
AU  - Ribić, Vesna
AU  - Kocen, Matej
AU  - Podlogar, Matejka
AU  - Dapčević, Aleksandra
AU  - Branković, Goran
AU  - Branković, Zorica
PY  - 2019
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2036
AB  - Zinc oxide (ZnO) is a versatile functional material, widely employed in industry
and technology as varistor ceramics, transparent conducting films, surface acoustic
wave resonators etc. ZnO-based conductive ceramics, attractive for various
applications, should have low electrical resistivity and good linearity. The n-type
conductivity of wide band gap (3.37 eV) ZnO semiconductor could be enhanced by
multiple doping with trivalent metals (B3+, Al3+, Ga3+, In3+), as shallow donors. The
intrinsic defects, zinc vacancies and interstitial oxygen, exist in the grain boundaries
of n-type ZnO ceramics as localized acceptor states. These states attract charge
carriers, creating a depletion region around the grain boundaries and energy
potential barrier, which hinder the motion of the electrons [1]. In this work, zinc
oxide ceramics doped with Al3+, B3+ and Mg2+ was prepared using solid-state
reaction technique from ZnO powder obtained in solvothermal synthesis and Al2O3,
MgO and B2O3 (H3BO3) commercial powders. Al2O3 was used as a donor dopant to
increase the carrier concentration, B2O3 was added to enhance densification and
grain growth, and MgO – to decrease the thermal conductivity [2,3]. The pressed
ZnO (0.25 % Al2O3, 0.5 % B2O3, 1 % MgO) pellets were sintered by conventional
(CS) and spark plasma (SPS) method. The ceramic samples were analyzed by X-ray
diffraction (XRD), scanning electron microscopy (SEM), transmission electron
microscopy (TEM), UV-Vis spectroscopy and current-voltage (I–U) measurements.
The correlation between the sintering processing, microstructure and electrical
properties of multiple doped ZnO-based ceramics was investigated. The electrical
performances of ZnO (0.25 % Al2O3, 0.5 % B2O3, 1 % MgO) ceramics were
strongly dependent on composition and microstructure (density, grain size,
segregation of secondary phase in grain boundaries). The electrical resistivity of SPS
sample was an order of magnitude lower than electrical resistivity of CS sample and
it showed almost linear I-U characteristics in temperature range of (25–150) C.
1. T.K. Gupta, W.G. Carlson, J. Mater. Sci., 20 (1985) 3487
2. T. Tian, L. Cheng, J. Xing, L. Zheng, Z. Man, D. Hu, S. Bernik, J. Zeng, J. Yang, Y.
Liu, G. Li, Mater. Design, 132 (2017) 479
3. B. Yuksel, T. O. Ozkan, Mater. Sci. – Poland, 33 (2015) 220
PB  - University of Belgrade, Institute for Multidisciplinary Research
C3  - 5th Conference of the Serbian Society for Ceramic Materials, 5CSCS-2019, June 11-13, 2019, Belgrade, Serbia
T1  - The influence of sintering processing on microstructural, optical and electrical properties of zinc oxide ceramics  doped with Al3+, B3+, Mg2+
EP  - 135
SP  - 134
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2036
ER  - 

@conference{
author = "Luković Golić, Danijela and Vukašinović, Jelena and Ribić, Vesna and Kocen, Matej and Podlogar, Matejka and Dapčević, Aleksandra and Branković, Goran and Branković, Zorica",
year = "2019",
abstract = "Zinc oxide (ZnO) is a versatile functional material, widely employed in industry
and technology as varistor ceramics, transparent conducting films, surface acoustic
wave resonators etc. ZnO-based conductive ceramics, attractive for various
applications, should have low electrical resistivity and good linearity. The n-type
conductivity of wide band gap (3.37 eV) ZnO semiconductor could be enhanced by
multiple doping with trivalent metals (B3+, Al3+, Ga3+, In3+), as shallow donors. The
intrinsic defects, zinc vacancies and interstitial oxygen, exist in the grain boundaries
of n-type ZnO ceramics as localized acceptor states. These states attract charge
carriers, creating a depletion region around the grain boundaries and energy
potential barrier, which hinder the motion of the electrons [1]. In this work, zinc
oxide ceramics doped with Al3+, B3+ and Mg2+ was prepared using solid-state
reaction technique from ZnO powder obtained in solvothermal synthesis and Al2O3,
MgO and B2O3 (H3BO3) commercial powders. Al2O3 was used as a donor dopant to
increase the carrier concentration, B2O3 was added to enhance densification and
grain growth, and MgO – to decrease the thermal conductivity [2,3]. The pressed
ZnO (0.25 % Al2O3, 0.5 % B2O3, 1 % MgO) pellets were sintered by conventional
(CS) and spark plasma (SPS) method. The ceramic samples were analyzed by X-ray
diffraction (XRD), scanning electron microscopy (SEM), transmission electron
microscopy (TEM), UV-Vis spectroscopy and current-voltage (I–U) measurements.
The correlation between the sintering processing, microstructure and electrical
properties of multiple doped ZnO-based ceramics was investigated. The electrical
performances of ZnO (0.25 % Al2O3, 0.5 % B2O3, 1 % MgO) ceramics were
strongly dependent on composition and microstructure (density, grain size,
segregation of secondary phase in grain boundaries). The electrical resistivity of SPS
sample was an order of magnitude lower than electrical resistivity of CS sample and
it showed almost linear I-U characteristics in temperature range of (25–150) C.
1. T.K. Gupta, W.G. Carlson, J. Mater. Sci., 20 (1985) 3487
2. T. Tian, L. Cheng, J. Xing, L. Zheng, Z. Man, D. Hu, S. Bernik, J. Zeng, J. Yang, Y.
Liu, G. Li, Mater. Design, 132 (2017) 479
3. B. Yuksel, T. O. Ozkan, Mater. Sci. – Poland, 33 (2015) 220",
publisher = "University of Belgrade, Institute for Multidisciplinary Research",
journal = "5th Conference of the Serbian Society for Ceramic Materials, 5CSCS-2019, June 11-13, 2019, Belgrade, Serbia",
title = "The influence of sintering processing on microstructural, optical and electrical properties of zinc oxide ceramics  doped with Al3+, B3+, Mg2+",
pages = "135-134",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2036"
}

Luković Golić, D., Vukašinović, J., Ribić, V., Kocen, M., Podlogar, M., Dapčević, A., Branković, G.,& Branković, Z.. (2019). The influence of sintering processing on microstructural, optical and electrical properties of zinc oxide ceramics  doped with Al3+, B3+, Mg2+. in 5th Conference of the Serbian Society for Ceramic Materials, 5CSCS-2019, June 11-13, 2019, Belgrade, Serbia
University of Belgrade, Institute for Multidisciplinary Research., 134-135.
https://hdl.handle.net/21.15107/rcub_rimsi_2036

Luković Golić D, Vukašinović J, Ribić V, Kocen M, Podlogar M, Dapčević A, Branković G, Branković Z. The influence of sintering processing on microstructural, optical and electrical properties of zinc oxide ceramics  doped with Al3+, B3+, Mg2+. in 5th Conference of the Serbian Society for Ceramic Materials, 5CSCS-2019, June 11-13, 2019, Belgrade, Serbia. 2019;:134-135.
https://hdl.handle.net/21.15107/rcub_rimsi_2036 .

Luković Golić, Danijela, Vukašinović, Jelena, Ribić, Vesna, Kocen, Matej, Podlogar, Matejka, Dapčević, Aleksandra, Branković, Goran, Branković, Zorica, "The influence of sintering processing on microstructural, optical and electrical properties of zinc oxide ceramics  doped with Al3+, B3+, Mg2+" in 5th Conference of the Serbian Society for Ceramic Materials, 5CSCS-2019, June 11-13, 2019, Belgrade, Serbia (2019):134-135,
https://hdl.handle.net/21.15107/rcub_rimsi_2036 .

TY  - CONF
AU  - Malešević, Aleksandar
AU  - Tasić, Nikola
AU  - Ćirković, Jovana
AU  - Vukašinović, Jelena
AU  - Dapčević, Aleksandra
AU  - Ribić, Vesna
AU  - Branković, Zorica
AU  - Branković, Goran
PY  - 2019
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2032
AB  - Determination and monitoring of humidity level is of great importance because
water is one of essential components of the living organisms and materials used by
people. Metal oxides are the most popular materials used as sensing elements for
humidity sensors, due to their excellent thermal and environmental stability, high
mechanical strength, wide range of working temperature, low fabrication cost and
robustness in practical applications. Humidity sensing ability of metal oxide based
ceramic materials can be enhanced by doping with metal cations.
In this work, we present hydrothermal method for preparation of pure and Mgdoped
CuO nanoplatelets and investigate their sensing properties towards humidity.
The proposed method involves autoclaving of copper(II)-acetate solution under
autogenous pressure in alkaline conditions, with different concentrations of Mgdopant
(0, 2.5, 5 and 10 mol%). We have performed thorough structural and optical
investigations of as synthesized material (TEM, XRD, SAED, UV-VIS-NIR).
Furthermore, we have processed obtained powders into functional thick films using doctor blade technique, and their sensing properties were tested in wide range of
temperatures (25, 50, 75 °C) and relative humidities (40–90%), resulting with strong
response and promising response/recovery times.
PB  - University of Belgrade, Institute for Multidisciplinary Research
C3  - 5th Conference of the Serbian Society for Ceramic Materials, 5CSCS-2019, June 11-13, 2019, Belgrade, Serbia
T1  - CuO-based nanoplatelets for humidity sensing application
EP  - 81
SP  - 80
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2032
ER  - 

@conference{
author = "Malešević, Aleksandar and Tasić, Nikola and Ćirković, Jovana and Vukašinović, Jelena and Dapčević, Aleksandra and Ribić, Vesna and Branković, Zorica and Branković, Goran",
year = "2019",
abstract = "Determination and monitoring of humidity level is of great importance because
water is one of essential components of the living organisms and materials used by
people. Metal oxides are the most popular materials used as sensing elements for
humidity sensors, due to their excellent thermal and environmental stability, high
mechanical strength, wide range of working temperature, low fabrication cost and
robustness in practical applications. Humidity sensing ability of metal oxide based
ceramic materials can be enhanced by doping with metal cations.
In this work, we present hydrothermal method for preparation of pure and Mgdoped
CuO nanoplatelets and investigate their sensing properties towards humidity.
The proposed method involves autoclaving of copper(II)-acetate solution under
autogenous pressure in alkaline conditions, with different concentrations of Mgdopant
(0, 2.5, 5 and 10 mol%). We have performed thorough structural and optical
investigations of as synthesized material (TEM, XRD, SAED, UV-VIS-NIR).
Furthermore, we have processed obtained powders into functional thick films using doctor blade technique, and their sensing properties were tested in wide range of
temperatures (25, 50, 75 °C) and relative humidities (40–90%), resulting with strong
response and promising response/recovery times.",
publisher = "University of Belgrade, Institute for Multidisciplinary Research",
journal = "5th Conference of the Serbian Society for Ceramic Materials, 5CSCS-2019, June 11-13, 2019, Belgrade, Serbia",
title = "CuO-based nanoplatelets for humidity sensing application",
pages = "81-80",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2032"
}

Malešević, A., Tasić, N., Ćirković, J., Vukašinović, J., Dapčević, A., Ribić, V., Branković, Z.,& Branković, G.. (2019). CuO-based nanoplatelets for humidity sensing application. in 5th Conference of the Serbian Society for Ceramic Materials, 5CSCS-2019, June 11-13, 2019, Belgrade, Serbia
University of Belgrade, Institute for Multidisciplinary Research., 80-81.
https://hdl.handle.net/21.15107/rcub_rimsi_2032

Malešević A, Tasić N, Ćirković J, Vukašinović J, Dapčević A, Ribić V, Branković Z, Branković G. CuO-based nanoplatelets for humidity sensing application. in 5th Conference of the Serbian Society for Ceramic Materials, 5CSCS-2019, June 11-13, 2019, Belgrade, Serbia. 2019;:80-81.
https://hdl.handle.net/21.15107/rcub_rimsi_2032 .

Malešević, Aleksandar, Tasić, Nikola, Ćirković, Jovana, Vukašinović, Jelena, Dapčević, Aleksandra, Ribić, Vesna, Branković, Zorica, Branković, Goran, "CuO-based nanoplatelets for humidity sensing application" in 5th Conference of the Serbian Society for Ceramic Materials, 5CSCS-2019, June 11-13, 2019, Belgrade, Serbia (2019):80-81,
https://hdl.handle.net/21.15107/rcub_rimsi_2032 .

TY  - CONF
AU  - Vukašinović, Jelena
AU  - Počuča-Nešić, Milica
AU  - Luković Golić, Danijela
AU  - Branković, Zorica
AU  - Dapčević, Aleksandra
AU  - Branković, Goran
PY  - 2018
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2086
AB  - Ternary lanthanum nickelates, La2NiO4, La3Ni2O7, La4Ni3O10 and LaNiO3 belong to Ruddlesden-Popper (RP) homologous series with the general formula Lan+1NinO3n+1, where n = 1, 2, 3 and ∞, respectively.The crystal structure of lanthanum nickelates consist of n perovskite layers (LaNiO3) separated by rocksalt layeres (LaO) along the crystallographic c direction. These compounds exhibit interesting electrical, magnetic, optical and catalytic properties. Owing to these properties, lanthanum nickelates find application such as catalysts in batteries and fuel cells, cathode materials for solid oxide fuel cells (SOFC), oxygen separation membranes, capacitors,
superconductors, electrical contacts and resistors. LaNiO3 (LNO) has a rhombohedrally distorted
perovskite structure. The conduction band in LNO is formed by the hybridization of the egorbitals
of Ni3+ and the p-orbitals of O2-. As a result, LNO has a metallic behaviour, which exibits
high electrical conductivity in wide range of temperature.
The main drawbacks of this material are poor density and thermal unstability at temepratures
above 850°C. Niobium, Nb5+, as a dopant could improve density and thermal stability of the
ceramic samples. Also, it could enhance electron concentration and mobility, leading to
improved electrical conductivity of ceramic. The type of atmosphere during thermal treatment
has an important influence on the stoichiometry of this material and preventing decomposition.
The aim of this work was to prepare ceramic materials of LaNi1-xNbxO3 (x = 0.005, 0.05) by
mechanochemically assisted solid state method. Commercial powders, La2O3, NiO and Nb2O5,
were mechanochemically activated in the planetary ball mill for 5 h and calcined at 700 °C for 3
h in air. Obtained powders were sintered at 900 °C and 1200 °C for 2 h and 10 h in various
atmospheres (air and oxygen). LaNi1-xNbxO3 ceramics was characterized by X-ray diffraction
(XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS).
The XRD analysis confirmed the existence of rhombohedral LaNiO3 and secondary phases,
Lan+1NinO3n+1 and NiO. Sintering in air atmosphere resulted in LaNiO3 ceramics with lower
content of secondary phases. However, sintering in oxygen atmosphere provided LaNi1-xNbxO3
ceramics with improved density, thermal stability and electrical conductivity.
C3  - Hot Topics in Contemporary Crystallography 3, HTCC3, workshop, September 23-27, 2018, Bol, Brač, Croatia
T1  - Influence of sintering temperature and various atmospheres on structural and electrical properties of LaNi1-xNbxO3 (x = 0.005, 0.05)
SP  - 59
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2086
ER  - 

@conference{
author = "Vukašinović, Jelena and Počuča-Nešić, Milica and Luković Golić, Danijela and Branković, Zorica and Dapčević, Aleksandra and Branković, Goran",
year = "2018",
abstract = "Ternary lanthanum nickelates, La2NiO4, La3Ni2O7, La4Ni3O10 and LaNiO3 belong to Ruddlesden-Popper (RP) homologous series with the general formula Lan+1NinO3n+1, where n = 1, 2, 3 and ∞, respectively.The crystal structure of lanthanum nickelates consist of n perovskite layers (LaNiO3) separated by rocksalt layeres (LaO) along the crystallographic c direction. These compounds exhibit interesting electrical, magnetic, optical and catalytic properties. Owing to these properties, lanthanum nickelates find application such as catalysts in batteries and fuel cells, cathode materials for solid oxide fuel cells (SOFC), oxygen separation membranes, capacitors,
superconductors, electrical contacts and resistors. LaNiO3 (LNO) has a rhombohedrally distorted
perovskite structure. The conduction band in LNO is formed by the hybridization of the egorbitals
of Ni3+ and the p-orbitals of O2-. As a result, LNO has a metallic behaviour, which exibits
high electrical conductivity in wide range of temperature.
The main drawbacks of this material are poor density and thermal unstability at temepratures
above 850°C. Niobium, Nb5+, as a dopant could improve density and thermal stability of the
ceramic samples. Also, it could enhance electron concentration and mobility, leading to
improved electrical conductivity of ceramic. The type of atmosphere during thermal treatment
has an important influence on the stoichiometry of this material and preventing decomposition.
The aim of this work was to prepare ceramic materials of LaNi1-xNbxO3 (x = 0.005, 0.05) by
mechanochemically assisted solid state method. Commercial powders, La2O3, NiO and Nb2O5,
were mechanochemically activated in the planetary ball mill for 5 h and calcined at 700 °C for 3
h in air. Obtained powders were sintered at 900 °C and 1200 °C for 2 h and 10 h in various
atmospheres (air and oxygen). LaNi1-xNbxO3 ceramics was characterized by X-ray diffraction
(XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS).
The XRD analysis confirmed the existence of rhombohedral LaNiO3 and secondary phases,
Lan+1NinO3n+1 and NiO. Sintering in air atmosphere resulted in LaNiO3 ceramics with lower
content of secondary phases. However, sintering in oxygen atmosphere provided LaNi1-xNbxO3
ceramics with improved density, thermal stability and electrical conductivity.",
journal = "Hot Topics in Contemporary Crystallography 3, HTCC3, workshop, September 23-27, 2018, Bol, Brač, Croatia",
title = "Influence of sintering temperature and various atmospheres on structural and electrical properties of LaNi1-xNbxO3 (x = 0.005, 0.05)",
pages = "59",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2086"
}

Vukašinović, J., Počuča-Nešić, M., Luković Golić, D., Branković, Z., Dapčević, A.,& Branković, G.. (2018). Influence of sintering temperature and various atmospheres on structural and electrical properties of LaNi1-xNbxO3 (x = 0.005, 0.05). in Hot Topics in Contemporary Crystallography 3, HTCC3, workshop, September 23-27, 2018, Bol, Brač, Croatia, 59.
https://hdl.handle.net/21.15107/rcub_rimsi_2086

Vukašinović J, Počuča-Nešić M, Luković Golić D, Branković Z, Dapčević A, Branković G. Influence of sintering temperature and various atmospheres on structural and electrical properties of LaNi1-xNbxO3 (x = 0.005, 0.05). in Hot Topics in Contemporary Crystallography 3, HTCC3, workshop, September 23-27, 2018, Bol, Brač, Croatia. 2018;:59.
https://hdl.handle.net/21.15107/rcub_rimsi_2086 .

Vukašinović, Jelena, Počuča-Nešić, Milica, Luković Golić, Danijela, Branković, Zorica, Dapčević, Aleksandra, Branković, Goran, "Influence of sintering temperature and various atmospheres on structural and electrical properties of LaNi1-xNbxO3 (x = 0.005, 0.05)" in Hot Topics in Contemporary Crystallography 3, HTCC3, workshop, September 23-27, 2018, Bol, Brač, Croatia (2018):59,
https://hdl.handle.net/21.15107/rcub_rimsi_2086 .

TY  - CONF
AU  - Vukašinović, Jelena
AU  - Počuča-Nešić, Milica
AU  - Luković Golić, Danijela
AU  - Branković, Zorica
AU  - Dapčević, Aleksandra
AU  - Branković, Goran
PY  - 2018
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2034
AB  - Perovskite type ceramic materials with general formula
ABO3 are very important class of materials due to their
various chemical and physical properties. They have wide
applications such as electrode material for solid state fuel
cells (SOFC), capacitors, resistors, superconductors,
catalysts, electrolytes, microwave devices, and
magnetoresitant materials [1, 2]. Lanthanum nickelate
(LaNiO3, LNO) is a ternary oxide with rhombohedrally
distorted perovskite lattice. In LNO trivalent nickel ions
(Ni3+) are in low spin configuration (t2g
6eg
1) and the
conduction band is formed by the hybridization of the egorbitals
of Ni3+ and the p-orbitals of oxygen. As a result,
LNO shows metallic n-type conductivity in wide temperature
range [3].
For this reason LNO has been proposed as a cathode material
for intermediate-temperature SOFCs (IT-SOFCs) with
operating temperature range of 650-800 °C. The possible
dawbacks of LNO as a potential material for this application
are poor density and thermal unstability at temperatures
higher than 850 °C, when LNO starts gradually to decompose
into the lower oxides Lan+1NinO3n+1 (n = 3, 2, 1) and NiO.
Still, all of these La-Ni-O compounds exhibit high electronic
conduction within the NiO6 octahedra in their perovskite
layers and excellent oxygen ionic conductivity through
oxygen interstitials on the LaO rock-salt plane. Also, their
coefficient of thermal expansion (CTE) matches those of
materials commonly used as IT-SOFC electrolyte and anode
[1].
A possible use of LNO as a cathode for SOFC requires the
improvement of its thermal stability and enhancement of
density of ceramic samples. The aim of this work was to
fullfill these requirements by doping of lanthanum-nickelate
into the B site. Using transition metal of higher valency than
Ni3+ as a dopant, could enhance the electron concentration
and carrier mobility, which results in improvement of
electrical conductivity of ceramic material. Doping could also
influence the sintering process and improve the density of the
ceramic materials.
In this work we present dense ceramic materials of LaNi1-
xNbxO3 (x = 0.005, 0.05) prepared by mechanochemically
assisted solid state method. La2O3, NiO and Nb2O5, used as a
precursor reagents, were mechanochemically activated in the
planetary ball mill for 5 h. Obtained powders were calcined at
700 °C for 3h in air, and afterwards sintered at 900 °C and
1200 °C for 2 h and 10 h in different atmospheres (air and
oxygen).
The influence of Nb doping on electrical properties and
microstructure of LaNi1-xNbxO3 ceramic materials was
investigated. All samples were analyzed by X-ray diffraction
analysis (XRD), scanning electron microscopy (SEM) and
energy dispersive X-ray spectroscopy (EDS). Electrical
conductivity of ceramic LaNi1-xNbxO3 samples was measured
in different mediums and complete characterization of
electrical properties was performed.
The XRD analysis indicated the existence of secondary
phases Lan+1NinO3n+1 and NiO along with the rhombohedral
LaNiO3. Samples sintered at 900 °C in oxygen atmosphere
for 2 h had density of 64 % and 60 % for x = 0.005 and x =
0.05 (Fig. 1). The electrical conductivity was improved by
doping with Nb, and obtained values were 2.7 S cm and 2.6 S
cm for x = 0.005 and x = 0.05 at room temperature. The
obtained results confirmed that doping by Nb along with
sintering in oxygen atmosphere can improve electrical
conductivity, density, and thermal stability.
References
[1] R.K. Sharma, E. Djurado, J Mater Chem A, 5 (2017)
22277-22287.
[2].A. S. Bhalla, R. Guo, R. Roy, Mat Res Innovat, 4 (2000)
3-26.
[3] K. Sreedhar et al., Phys Rev B, 46 (1992) 6382-6386.
PB  - University of Belgrade, Vinča Institute of Nuclear Sciences
PB  - Hydrogen Economy Initiative Serbia, Belgrade
C3  - 3rd International Symposium on Materials for Energy Storage and Conversion, mESC-IS, September 10-12, 2018, Belgrade, Serbia
T1  - Synthesis and characterization of Nb-doped lanthanum nickelate La(Ni,Nb)O3
SP  - 78
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2034
ER  - 

@conference{
author = "Vukašinović, Jelena and Počuča-Nešić, Milica and Luković Golić, Danijela and Branković, Zorica and Dapčević, Aleksandra and Branković, Goran",
year = "2018",
abstract = "Perovskite type ceramic materials with general formula
ABO3 are very important class of materials due to their
various chemical and physical properties. They have wide
applications such as electrode material for solid state fuel
cells (SOFC), capacitors, resistors, superconductors,
catalysts, electrolytes, microwave devices, and
magnetoresitant materials [1, 2]. Lanthanum nickelate
(LaNiO3, LNO) is a ternary oxide with rhombohedrally
distorted perovskite lattice. In LNO trivalent nickel ions
(Ni3+) are in low spin configuration (t2g
6eg
1) and the
conduction band is formed by the hybridization of the egorbitals
of Ni3+ and the p-orbitals of oxygen. As a result,
LNO shows metallic n-type conductivity in wide temperature
range [3].
For this reason LNO has been proposed as a cathode material
for intermediate-temperature SOFCs (IT-SOFCs) with
operating temperature range of 650-800 °C. The possible
dawbacks of LNO as a potential material for this application
are poor density and thermal unstability at temperatures
higher than 850 °C, when LNO starts gradually to decompose
into the lower oxides Lan+1NinO3n+1 (n = 3, 2, 1) and NiO.
Still, all of these La-Ni-O compounds exhibit high electronic
conduction within the NiO6 octahedra in their perovskite
layers and excellent oxygen ionic conductivity through
oxygen interstitials on the LaO rock-salt plane. Also, their
coefficient of thermal expansion (CTE) matches those of
materials commonly used as IT-SOFC electrolyte and anode
[1].
A possible use of LNO as a cathode for SOFC requires the
improvement of its thermal stability and enhancement of
density of ceramic samples. The aim of this work was to
fullfill these requirements by doping of lanthanum-nickelate
into the B site. Using transition metal of higher valency than
Ni3+ as a dopant, could enhance the electron concentration
and carrier mobility, which results in improvement of
electrical conductivity of ceramic material. Doping could also
influence the sintering process and improve the density of the
ceramic materials.
In this work we present dense ceramic materials of LaNi1-
xNbxO3 (x = 0.005, 0.05) prepared by mechanochemically
assisted solid state method. La2O3, NiO and Nb2O5, used as a
precursor reagents, were mechanochemically activated in the
planetary ball mill for 5 h. Obtained powders were calcined at
700 °C for 3h in air, and afterwards sintered at 900 °C and
1200 °C for 2 h and 10 h in different atmospheres (air and
oxygen).
The influence of Nb doping on electrical properties and
microstructure of LaNi1-xNbxO3 ceramic materials was
investigated. All samples were analyzed by X-ray diffraction
analysis (XRD), scanning electron microscopy (SEM) and
energy dispersive X-ray spectroscopy (EDS). Electrical
conductivity of ceramic LaNi1-xNbxO3 samples was measured
in different mediums and complete characterization of
electrical properties was performed.
The XRD analysis indicated the existence of secondary
phases Lan+1NinO3n+1 and NiO along with the rhombohedral
LaNiO3. Samples sintered at 900 °C in oxygen atmosphere
for 2 h had density of 64 % and 60 % for x = 0.005 and x =
0.05 (Fig. 1). The electrical conductivity was improved by
doping with Nb, and obtained values were 2.7 S cm and 2.6 S
cm for x = 0.005 and x = 0.05 at room temperature. The
obtained results confirmed that doping by Nb along with
sintering in oxygen atmosphere can improve electrical
conductivity, density, and thermal stability.
References
[1] R.K. Sharma, E. Djurado, J Mater Chem A, 5 (2017)
22277-22287.
[2].A. S. Bhalla, R. Guo, R. Roy, Mat Res Innovat, 4 (2000)
3-26.
[3] K. Sreedhar et al., Phys Rev B, 46 (1992) 6382-6386.",
publisher = "University of Belgrade, Vinča Institute of Nuclear Sciences, Hydrogen Economy Initiative Serbia, Belgrade",
journal = "3rd International Symposium on Materials for Energy Storage and Conversion, mESC-IS, September 10-12, 2018, Belgrade, Serbia",
title = "Synthesis and characterization of Nb-doped lanthanum nickelate La(Ni,Nb)O3",
pages = "78",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2034"
}

Vukašinović, J., Počuča-Nešić, M., Luković Golić, D., Branković, Z., Dapčević, A.,& Branković, G.. (2018). Synthesis and characterization of Nb-doped lanthanum nickelate La(Ni,Nb)O3. in 3rd International Symposium on Materials for Energy Storage and Conversion, mESC-IS, September 10-12, 2018, Belgrade, Serbia
University of Belgrade, Vinča Institute of Nuclear Sciences., 78.
https://hdl.handle.net/21.15107/rcub_rimsi_2034

Vukašinović J, Počuča-Nešić M, Luković Golić D, Branković Z, Dapčević A, Branković G. Synthesis and characterization of Nb-doped lanthanum nickelate La(Ni,Nb)O3. in 3rd International Symposium on Materials for Energy Storage and Conversion, mESC-IS, September 10-12, 2018, Belgrade, Serbia. 2018;:78.
https://hdl.handle.net/21.15107/rcub_rimsi_2034 .

Vukašinović, Jelena, Počuča-Nešić, Milica, Luković Golić, Danijela, Branković, Zorica, Dapčević, Aleksandra, Branković, Goran, "Synthesis and characterization of Nb-doped lanthanum nickelate La(Ni,Nb)O3" in 3rd International Symposium on Materials for Energy Storage and Conversion, mESC-IS, September 10-12, 2018, Belgrade, Serbia (2018):78,
https://hdl.handle.net/21.15107/rcub_rimsi_2034 .

TY  - CONF
AU  - Vukašinović, Jelena
AU  - Počuča-Nešić, Milica
AU  - Luković Golić, Danijela
AU  - Savic, Slavica
AU  - Branković, Zorica
AU  - Tasić, Nikola
AU  - Dapčević, Aleksandra
AU  - Bernik, Slavko
AU  - Kocen, Matej
AU  - Branković, Goran
PY  - 2018
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2035
AB  - Perovskite-type materials are widely important class of materials due to their
interesting physical properties, such as superconductivity, ferromagnetism,
ferroelectricity, piezoelectricity, and many others [1]. Barium stannate (BaSnO3) is
crystalizing in an ideal cubic structure, and has good chemical and thermal stability
at high temperatures up to 1200 °C. Undoped BaSnO3 is an n-type semiconductor
with a band gap of ~3.1 eV [1]. BaSnO3 finds application as dielectric ceramic
material, transparent conducting oxide (TCO), resistor, photocatalyst, photoanode
material, gas sensor for many gases, protonic conductor. Doping with antimony (Sb)
can improve the electrical conductivity and enhance density during sintering [1-4].
In this work samples of BaSn1-xSbxO3 (x = 0.04, 0.06, 0.08, 0.1) were prepared by
mechanochemically assisted solid state method. Precursor powders BaCO3, SnO2
and Sb2O3 were mechanochemically activated in isopropanol for 8h. After drying
prepared powders were calcined at 900 °C for 4h in air. Calcined powder were
mounted into a carbon die and subsequently sintered by spark plasma sintering (SPS)
at 1200 °C for 5 minutes. Structural properties of the obtained ceramic samples of
(BaSn1-xSbxO3) were completely characterized by X-ray diffraction (XRD), scanning
electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and
atomic force microscopy (AFM). Electrical properties of the ceramic BaSn1-xSbxO3
samples were determined by measuring the current-voltage characteristics at room
temperature and elevated temperatures in different mediums (air, silicon oil). The XRD analysis showed the formation of the cubic perovskite BaSnO3 as a major phase
and Ba2SnO4 as a secondary phase. The content of tetragonal secondary phase of
Ba2SnO4 was approximately the same in all samples. This confirmed that presence
of Sb did not influence the forming of Ba2SnO4. Ionic radius of Sb3+ (0.076 nm) is
larger than ionic radius of Sn4+ (0.069 nm), and it incorporation by lattice leads to
the increase of lattice parameter [4]. The cubic lattice parameter a was estimated to
be 0.41287(9), 0.41301(9), 0.41321(9) and 0.41302(4) nm for x =0.04, 0.06, 0.08 and
0.1, respectively. The relative densities were 95.2 %, 84.2 %, 85.9 % and 79.2 %
for x =0.04, 0.06, 0.08 and 0.1, respectively The SEM images of the fractured
surfaces of the obtained ceramics revealed that all samples were well-densified,
with the trend of reducing a grain size with increasing of Sb concentration. The
AFM images showed the existence of various particles shapes, with the particle
size of around 36 nm.

References:
[1] M Hiroshi et al, Chemistry of Materials 25 (19) (2013), 3858.
[2] Y Masahiro et al, Materials Science and Engineering B 173 (2010), 29.
[3] L Wenzhong et al, Sensors and Actuators 80 (2000), 35.
[4] Y Daisuke et al, Materials Science and Engineering B 173 (2010), 33.
[5] The authors would like to acknowledge the financial support of the Ministry of
Education, Science and Technological Development of the Republic of Serbia,
project III 45007.
PB  - Belgrade : Serbian Academy of Sciences and Arts
C3  - 1st International Conference: „Electron Microscopy of Nanostructures“, ELMINA, 2018 Conference, August 27-29, 2018, Belgrade, Serbia
T1  - Improvement of density and influence of Sb doping on structural properties of perovskite BaSnO3
EP  - 167
SP  - 166
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2035
ER  - 

@conference{
author = "Vukašinović, Jelena and Počuča-Nešić, Milica and Luković Golić, Danijela and Savic, Slavica and Branković, Zorica and Tasić, Nikola and Dapčević, Aleksandra and Bernik, Slavko and Kocen, Matej and Branković, Goran",
year = "2018",
abstract = "Perovskite-type materials are widely important class of materials due to their
interesting physical properties, such as superconductivity, ferromagnetism,
ferroelectricity, piezoelectricity, and many others [1]. Barium stannate (BaSnO3) is
crystalizing in an ideal cubic structure, and has good chemical and thermal stability
at high temperatures up to 1200 °C. Undoped BaSnO3 is an n-type semiconductor
with a band gap of ~3.1 eV [1]. BaSnO3 finds application as dielectric ceramic
material, transparent conducting oxide (TCO), resistor, photocatalyst, photoanode
material, gas sensor for many gases, protonic conductor. Doping with antimony (Sb)
can improve the electrical conductivity and enhance density during sintering [1-4].
In this work samples of BaSn1-xSbxO3 (x = 0.04, 0.06, 0.08, 0.1) were prepared by
mechanochemically assisted solid state method. Precursor powders BaCO3, SnO2
and Sb2O3 were mechanochemically activated in isopropanol for 8h. After drying
prepared powders were calcined at 900 °C for 4h in air. Calcined powder were
mounted into a carbon die and subsequently sintered by spark plasma sintering (SPS)
at 1200 °C for 5 minutes. Structural properties of the obtained ceramic samples of
(BaSn1-xSbxO3) were completely characterized by X-ray diffraction (XRD), scanning
electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and
atomic force microscopy (AFM). Electrical properties of the ceramic BaSn1-xSbxO3
samples were determined by measuring the current-voltage characteristics at room
temperature and elevated temperatures in different mediums (air, silicon oil). The XRD analysis showed the formation of the cubic perovskite BaSnO3 as a major phase
and Ba2SnO4 as a secondary phase. The content of tetragonal secondary phase of
Ba2SnO4 was approximately the same in all samples. This confirmed that presence
of Sb did not influence the forming of Ba2SnO4. Ionic radius of Sb3+ (0.076 nm) is
larger than ionic radius of Sn4+ (0.069 nm), and it incorporation by lattice leads to
the increase of lattice parameter [4]. The cubic lattice parameter a was estimated to
be 0.41287(9), 0.41301(9), 0.41321(9) and 0.41302(4) nm for x =0.04, 0.06, 0.08 and
0.1, respectively. The relative densities were 95.2 %, 84.2 %, 85.9 % and 79.2 %
for x =0.04, 0.06, 0.08 and 0.1, respectively The SEM images of the fractured
surfaces of the obtained ceramics revealed that all samples were well-densified,
with the trend of reducing a grain size with increasing of Sb concentration. The
AFM images showed the existence of various particles shapes, with the particle
size of around 36 nm.

References:
[1] M Hiroshi et al, Chemistry of Materials 25 (19) (2013), 3858.
[2] Y Masahiro et al, Materials Science and Engineering B 173 (2010), 29.
[3] L Wenzhong et al, Sensors and Actuators 80 (2000), 35.
[4] Y Daisuke et al, Materials Science and Engineering B 173 (2010), 33.
[5] The authors would like to acknowledge the financial support of the Ministry of
Education, Science and Technological Development of the Republic of Serbia,
project III 45007.",
publisher = "Belgrade : Serbian Academy of Sciences and Arts",
journal = "1st International Conference: „Electron Microscopy of Nanostructures“, ELMINA, 2018 Conference, August 27-29, 2018, Belgrade, Serbia",
title = "Improvement of density and influence of Sb doping on structural properties of perovskite BaSnO3",
pages = "167-166",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2035"
}

Vukašinović, J., Počuča-Nešić, M., Luković Golić, D., Savic, S., Branković, Z., Tasić, N., Dapčević, A., Bernik, S., Kocen, M.,& Branković, G.. (2018). Improvement of density and influence of Sb doping on structural properties of perovskite BaSnO3. in 1st International Conference: „Electron Microscopy of Nanostructures“, ELMINA, 2018 Conference, August 27-29, 2018, Belgrade, Serbia
Belgrade : Serbian Academy of Sciences and Arts., 166-167.
https://hdl.handle.net/21.15107/rcub_rimsi_2035

Vukašinović J, Počuča-Nešić M, Luković Golić D, Savic S, Branković Z, Tasić N, Dapčević A, Bernik S, Kocen M, Branković G. Improvement of density and influence of Sb doping on structural properties of perovskite BaSnO3. in 1st International Conference: „Electron Microscopy of Nanostructures“, ELMINA, 2018 Conference, August 27-29, 2018, Belgrade, Serbia. 2018;:166-167.
https://hdl.handle.net/21.15107/rcub_rimsi_2035 .

Vukašinović, Jelena, Počuča-Nešić, Milica, Luković Golić, Danijela, Savic, Slavica, Branković, Zorica, Tasić, Nikola, Dapčević, Aleksandra, Bernik, Slavko, Kocen, Matej, Branković, Goran, "Improvement of density and influence of Sb doping on structural properties of perovskite BaSnO3" in 1st International Conference: „Electron Microscopy of Nanostructures“, ELMINA, 2018 Conference, August 27-29, 2018, Belgrade, Serbia (2018):166-167,
https://hdl.handle.net/21.15107/rcub_rimsi_2035 .

TY  - CONF
AU  - Vukašinović, Jelena
AU  - Počuča-Nešić, Milica
AU  - Luković Golić, Danijela
AU  - Savic, Slavica
AU  - Branković, Zorica
AU  - Branković, Goran
PY  - 2017
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2033
AB  - BaSnO3 is a perovskite oxide widely used as dielectric ceramic material,
thermally stable capacitor in electronic industry and chemical humidity sensor. It is
also an electrical insulator (band gap ~ 3.1 eV), which becomes an n-type conductor
by doping.
The aim of this work was to prepare BaSn(1−x)SbxO3 (BSSO) by
mechanochemically assisted solid-state synthesis, starting from BaCO3, SnO2 and
Sb2O3 as precursors. The concentration of Sb in BSSO was varied from 0.04 to 0.1.
All starting mixtures were homogenized and activated in a planetary ball mill with
isopropanol as a solvent. As-prepared powders were dried and calcined at 900 °C for
4 h. After calcination, powders were uniaxially pressed into pellets and sintered at
temperature of 1200 °C for 3 h. Phase composition and microstructure of perovskite
BSSO were identified by X-ray diffraction (XRD) and scanning electron microscopy
(SEM), respectively. The influence of Sb doping on electrical characteristics of
ceramic material was determined by measuring the current-voltage characteristics
for all samples at room temperature in air. The band gap values for BSSO calculated
using Kubelka-Munk transformation and Tauc linearization of the obtained diffuse
reflectance spectra, confirmed conductive behavior of preparedceramic samples.
PB  - University of Belgrade, Institute for Multidisciplinary Research
C3  - 4th Conference of The Serbian Society for Ceramic Materials, 4CSCS-2017, June 14-16, 2017, Belgrade, Serbia
T1  - Electrical properties of BaSn(1-x)SbxO3 ceramics materials
SP  - 115
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2033
ER  - 

@conference{
author = "Vukašinović, Jelena and Počuča-Nešić, Milica and Luković Golić, Danijela and Savic, Slavica and Branković, Zorica and Branković, Goran",
year = "2017",
abstract = "BaSnO3 is a perovskite oxide widely used as dielectric ceramic material,
thermally stable capacitor in electronic industry and chemical humidity sensor. It is
also an electrical insulator (band gap ~ 3.1 eV), which becomes an n-type conductor
by doping.
The aim of this work was to prepare BaSn(1−x)SbxO3 (BSSO) by
mechanochemically assisted solid-state synthesis, starting from BaCO3, SnO2 and
Sb2O3 as precursors. The concentration of Sb in BSSO was varied from 0.04 to 0.1.
All starting mixtures were homogenized and activated in a planetary ball mill with
isopropanol as a solvent. As-prepared powders were dried and calcined at 900 °C for
4 h. After calcination, powders were uniaxially pressed into pellets and sintered at
temperature of 1200 °C for 3 h. Phase composition and microstructure of perovskite
BSSO were identified by X-ray diffraction (XRD) and scanning electron microscopy
(SEM), respectively. The influence of Sb doping on electrical characteristics of
ceramic material was determined by measuring the current-voltage characteristics
for all samples at room temperature in air. The band gap values for BSSO calculated
using Kubelka-Munk transformation and Tauc linearization of the obtained diffuse
reflectance spectra, confirmed conductive behavior of preparedceramic samples.",
publisher = "University of Belgrade, Institute for Multidisciplinary Research",
journal = "4th Conference of The Serbian Society for Ceramic Materials, 4CSCS-2017, June 14-16, 2017, Belgrade, Serbia",
title = "Electrical properties of BaSn(1-x)SbxO3 ceramics materials",
pages = "115",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2033"
}

Vukašinović, J., Počuča-Nešić, M., Luković Golić, D., Savic, S., Branković, Z.,& Branković, G.. (2017). Electrical properties of BaSn(1-x)SbxO3 ceramics materials. in 4th Conference of The Serbian Society for Ceramic Materials, 4CSCS-2017, June 14-16, 2017, Belgrade, Serbia
University of Belgrade, Institute for Multidisciplinary Research., 115.
https://hdl.handle.net/21.15107/rcub_rimsi_2033

Vukašinović J, Počuča-Nešić M, Luković Golić D, Savic S, Branković Z, Branković G. Electrical properties of BaSn(1-x)SbxO3 ceramics materials. in 4th Conference of The Serbian Society for Ceramic Materials, 4CSCS-2017, June 14-16, 2017, Belgrade, Serbia. 2017;:115.
https://hdl.handle.net/21.15107/rcub_rimsi_2033 .

Vukašinović, Jelena, Počuča-Nešić, Milica, Luković Golić, Danijela, Savic, Slavica, Branković, Zorica, Branković, Goran, "Electrical properties of BaSn(1-x)SbxO3 ceramics materials" in 4th Conference of The Serbian Society for Ceramic Materials, 4CSCS-2017, June 14-16, 2017, Belgrade, Serbia (2017):115,
https://hdl.handle.net/21.15107/rcub_rimsi_2033 .

TY  - JOUR
AU  - Todorović, Tamara
AU  - Vukašinović, Jelena
AU  - Portalone, Gustavo
AU  - suleiman, sherif
AU  - Gligorijević, Nevenka
AU  - Bjelogrlic, Snezana K.
AU  - Jovanovic, Katarina
AU  - Radulović, Sinisa S
AU  - Andjelkovic, Katarina
AU  - Cassar, Analisse
AU  - Filipović, Nenad
AU  - Schembri-WIsmayer, Pierre
PY  - 2017
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2027
AB  - Cobaltcomplexeswithsemi-andthiosemicarbazonesof8-quinolinecarboxaldehydehavebeensynthesizedandcharacterizedbyX-raydiffractionanalysis.Thesenovelcomplexesandapreviouslysynthesized cobaltcomplexwithaselenium-basedselenosemicarbazoneligandshowedmyeloiddifferentiationactivity onalltransretinoicacidresistantHL-60acutemyeloidleukaemiacells.Theyalsoshowedvaryinglevelsof cytotoxicityonfivehumantumorcelllines:cervixcarcinomacells(HeLa),lungadenocarcinomacells (A549),colorectaladenocarcinomacells(LS-174),breastcarcinomacells(MDA-MB-361),andchronicmyeloidleukaemia(K562)aswellasonenormalhumancellline:fetallungfibroblastcells(MRC-5).Leukaemia differentiationwasmoststronglyinducedbyametal-freeoxygenligandandtheseleniumligand,whilst thelatterandthecobaltIJII)complexwithanoxygenligandshowedthestrongestdose-dependentcytotoxic activity.Infouroutoffiveinvestigatedtumorcelllines,itwasofthesameorderofmagnitudeascisplatin. Thesebestcompounds,however,hadlowertoxicityonnon-transformedMRC-5cellsthancisplatin.
PB  - RSC Publishing
T2  - MedChemComm
T1  - (Chalcogen)semicarbazones and their cobalt complexes differentiate HL-60 myeloid leukaemia cells and are cytotoxic towards tumor cell lines
EP  - 111
IS  - 1
SP  - 103
VL  - 8
DO  - https://doi.org/10.1039/c6md00501b
ER  - 

@article{
author = "Todorović, Tamara and Vukašinović, Jelena and Portalone, Gustavo and suleiman, sherif and Gligorijević, Nevenka and Bjelogrlic, Snezana K. and Jovanovic, Katarina and Radulović, Sinisa S and Andjelkovic, Katarina and Cassar, Analisse and Filipović, Nenad and Schembri-WIsmayer, Pierre",
year = "2017",
abstract = "Cobaltcomplexeswithsemi-andthiosemicarbazonesof8-quinolinecarboxaldehydehavebeensynthesizedandcharacterizedbyX-raydiffractionanalysis.Thesenovelcomplexesandapreviouslysynthesized cobaltcomplexwithaselenium-basedselenosemicarbazoneligandshowedmyeloiddifferentiationactivity onalltransretinoicacidresistantHL-60acutemyeloidleukaemiacells.Theyalsoshowedvaryinglevelsof cytotoxicityonfivehumantumorcelllines:cervixcarcinomacells(HeLa),lungadenocarcinomacells (A549),colorectaladenocarcinomacells(LS-174),breastcarcinomacells(MDA-MB-361),andchronicmyeloidleukaemia(K562)aswellasonenormalhumancellline:fetallungfibroblastcells(MRC-5).Leukaemia differentiationwasmoststronglyinducedbyametal-freeoxygenligandandtheseleniumligand,whilst thelatterandthecobaltIJII)complexwithanoxygenligandshowedthestrongestdose-dependentcytotoxic activity.Infouroutoffiveinvestigatedtumorcelllines,itwasofthesameorderofmagnitudeascisplatin. Thesebestcompounds,however,hadlowertoxicityonnon-transformedMRC-5cellsthancisplatin.",
publisher = "RSC Publishing",
journal = "MedChemComm",
title = "(Chalcogen)semicarbazones and their cobalt complexes differentiate HL-60 myeloid leukaemia cells and are cytotoxic towards tumor cell lines",
pages = "111-103",
number = "1",
volume = "8",
doi = "https://doi.org/10.1039/c6md00501b"
}

Todorović, T., Vukašinović, J., Portalone, G., suleiman, s., Gligorijević, N., Bjelogrlic, S. K., Jovanovic, K., Radulović, S. S., Andjelkovic, K., Cassar, A., Filipović, N.,& Schembri-WIsmayer, P.. (2017). (Chalcogen)semicarbazones and their cobalt complexes differentiate HL-60 myeloid leukaemia cells and are cytotoxic towards tumor cell lines. in MedChemComm
RSC Publishing., 8(1), 103-111.
https://doi.org/https://doi.org/10.1039/c6md00501b

Todorović T, Vukašinović J, Portalone G, suleiman S, Gligorijević N, Bjelogrlic SK, Jovanovic K, Radulović SS, Andjelkovic K, Cassar A, Filipović N, Schembri-WIsmayer P. (Chalcogen)semicarbazones and their cobalt complexes differentiate HL-60 myeloid leukaemia cells and are cytotoxic towards tumor cell lines. in MedChemComm. 2017;8(1):103-111.
doi:https://doi.org/10.1039/c6md00501b .

Todorović, Tamara, Vukašinović, Jelena, Portalone, Gustavo, suleiman, sherif, Gligorijević, Nevenka, Bjelogrlic, Snezana K., Jovanovic, Katarina, Radulović, Sinisa S, Andjelkovic, Katarina, Cassar, Analisse, Filipović, Nenad, Schembri-WIsmayer, Pierre, "(Chalcogen)semicarbazones and their cobalt complexes differentiate HL-60 myeloid leukaemia cells and are cytotoxic towards tumor cell lines" in MedChemComm, 8, no. 1 (2017):103-111,
https://doi.org/https://doi.org/10.1039/c6md00501b . .

TY  - JOUR
AU  - Đorđević, Ivana S.
AU  - Mitrović, Jelena
AU  - Todorović, Tamara R.
AU  - Filipović, Nenad R.
AU  - Rodic, Marko
AU  - Lolic, Aleksandar
AU  - Portalone, Gustavo
AU  - Zlatović, Mario
AU  - Grubisic, Sonja
PY  - 2017
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/1032
AB  - Cobalt(III) complexes derived from thio-and selenosemicarbazone ligands have been studied to elucidate the nature and consequences of S to Se substitution on their possible biological activity. Solid state structures of cobalt(III) complexes with bis-tridentate coordinated 2-quinolinecarboxaldehyde thio-and selenosemicarbazone were determined by single crystal X-ray diffraction analysis. The complexes were also characterized by spectroscopic methods and cyclic voltammetry. Electronic properties of the complexes were studied using DFT and TD-DFT methods. Finally, evident in vitro antioxidant activity of the complexes was demonstrated.
PB  - Srpsko hemijsko društvo, Beograd
T2  - Journal of the Serbian Chemical Society
T1  - Synthesis, structures and electronic properties of Co(III) complexes with 2-quinolinecarboxaldehyde thio- and selenosemicarbazone: A combined experimental and theoretical study
EP  - 839
IS  - 7-8
SP  - 825
VL  - 82
DO  - 10.2298/JSC170412062D
ER  - 

@article{
author = "Đorđević, Ivana S. and Mitrović, Jelena and Todorović, Tamara R. and Filipović, Nenad R. and Rodic, Marko and Lolic, Aleksandar and Portalone, Gustavo and Zlatović, Mario and Grubisic, Sonja",
year = "2017",
abstract = "Cobalt(III) complexes derived from thio-and selenosemicarbazone ligands have been studied to elucidate the nature and consequences of S to Se substitution on their possible biological activity. Solid state structures of cobalt(III) complexes with bis-tridentate coordinated 2-quinolinecarboxaldehyde thio-and selenosemicarbazone were determined by single crystal X-ray diffraction analysis. The complexes were also characterized by spectroscopic methods and cyclic voltammetry. Electronic properties of the complexes were studied using DFT and TD-DFT methods. Finally, evident in vitro antioxidant activity of the complexes was demonstrated.",
publisher = "Srpsko hemijsko društvo, Beograd",
journal = "Journal of the Serbian Chemical Society",
title = "Synthesis, structures and electronic properties of Co(III) complexes with 2-quinolinecarboxaldehyde thio- and selenosemicarbazone: A combined experimental and theoretical study",
pages = "839-825",
number = "7-8",
volume = "82",
doi = "10.2298/JSC170412062D"
}

Đorđević, I. S., Mitrović, J., Todorović, T. R., Filipović, N. R., Rodic, M., Lolic, A., Portalone, G., Zlatović, M.,& Grubisic, S.. (2017). Synthesis, structures and electronic properties of Co(III) complexes with 2-quinolinecarboxaldehyde thio- and selenosemicarbazone: A combined experimental and theoretical study. in Journal of the Serbian Chemical Society
Srpsko hemijsko društvo, Beograd., 82(7-8), 825-839.
https://doi.org/10.2298/JSC170412062D

Đorđević IS, Mitrović J, Todorović TR, Filipović NR, Rodic M, Lolic A, Portalone G, Zlatović M, Grubisic S. Synthesis, structures and electronic properties of Co(III) complexes with 2-quinolinecarboxaldehyde thio- and selenosemicarbazone: A combined experimental and theoretical study. in Journal of the Serbian Chemical Society. 2017;82(7-8):825-839.
doi:10.2298/JSC170412062D .

Đorđević, Ivana S., Mitrović, Jelena, Todorović, Tamara R., Filipović, Nenad R., Rodic, Marko, Lolic, Aleksandar, Portalone, Gustavo, Zlatović, Mario, Grubisic, Sonja, "Synthesis, structures and electronic properties of Co(III) complexes with 2-quinolinecarboxaldehyde thio- and selenosemicarbazone: A combined experimental and theoretical study" in Journal of the Serbian Chemical Society, 82, no. 7-8 (2017):825-839,
https://doi.org/10.2298/JSC170412062D . .

TY  - CONF
AU  - Vukašinović, Jelena
AU  - Babic, Nikolina
AU  - Todorović, Tamara
AU  - Filipović, Nenad
PY  - 2016
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2079
AB  - The aim of this study was to elucidate the structure, geometry and biological activity of platinum(II) and palladium(II) complexes with different quinoline derivatives of thiosemicar-bazones. Four novel platinum(II) and palladium(II) complexes with 2-quinolinecarboxaldehyde thiosemikarbazone (H2QATSC) and 8-quinolinecarboxaldehyde thiosemikarbazone (H8QATSC) were synthesized. The complexes of platinum(II) and palladium(II) with H2QATSC ligand, [PtCl(2QATSC)] (1) and [PdCl(2QATSC)] (2), were synthesized by direct reaction and charac-terized by single crystal X-ray analysis. The complexes of platinum(II) and palladium(II) with H8QATSC ligand, [PtCl(8QATSC)] (3) and [PdCl(8QATSC)] (4), were characterized by NMR spectroscopy. In the complexes 1–4 ligands are coordinated tridentately via the quinoline and imine nitrogen atoms and thiosemicarbazone sulfur atom, forming two five-membered rings with metal ion. The geometry around metal ions is square-planar, where chloride ion occupies fourth coordination site. Antitumor activity of the complexes 1–4 was investigated and com-pared with the activity of cisplatin.
PB  - Serbian Chemical Society
C3  - 4th Conference of Young Chemists of Serbia, 5 November, 2016, Belgrade, Serbia
T1  - Synthesis, characterization and biological activity of platinum(II) and palladium(II) complexes with quinoline derivatives of thiosemicarbazones
SP  - 37
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2079
ER  - 

@conference{
author = "Vukašinović, Jelena and Babic, Nikolina and Todorović, Tamara and Filipović, Nenad",
year = "2016",
abstract = "The aim of this study was to elucidate the structure, geometry and biological activity of platinum(II) and palladium(II) complexes with different quinoline derivatives of thiosemicar-bazones. Four novel platinum(II) and palladium(II) complexes with 2-quinolinecarboxaldehyde thiosemikarbazone (H2QATSC) and 8-quinolinecarboxaldehyde thiosemikarbazone (H8QATSC) were synthesized. The complexes of platinum(II) and palladium(II) with H2QATSC ligand, [PtCl(2QATSC)] (1) and [PdCl(2QATSC)] (2), were synthesized by direct reaction and charac-terized by single crystal X-ray analysis. The complexes of platinum(II) and palladium(II) with H8QATSC ligand, [PtCl(8QATSC)] (3) and [PdCl(8QATSC)] (4), were characterized by NMR spectroscopy. In the complexes 1–4 ligands are coordinated tridentately via the quinoline and imine nitrogen atoms and thiosemicarbazone sulfur atom, forming two five-membered rings with metal ion. The geometry around metal ions is square-planar, where chloride ion occupies fourth coordination site. Antitumor activity of the complexes 1–4 was investigated and com-pared with the activity of cisplatin.",
publisher = "Serbian Chemical Society",
journal = "4th Conference of Young Chemists of Serbia, 5 November, 2016, Belgrade, Serbia",
title = "Synthesis, characterization and biological activity of platinum(II) and palladium(II) complexes with quinoline derivatives of thiosemicarbazones",
pages = "37",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2079"
}

Vukašinović, J., Babic, N., Todorović, T.,& Filipović, N.. (2016). Synthesis, characterization and biological activity of platinum(II) and palladium(II) complexes with quinoline derivatives of thiosemicarbazones. in 4th Conference of Young Chemists of Serbia, 5 November, 2016, Belgrade, Serbia
Serbian Chemical Society., 37.
https://hdl.handle.net/21.15107/rcub_rimsi_2079

Vukašinović J, Babic N, Todorović T, Filipović N. Synthesis, characterization and biological activity of platinum(II) and palladium(II) complexes with quinoline derivatives of thiosemicarbazones. in 4th Conference of Young Chemists of Serbia, 5 November, 2016, Belgrade, Serbia. 2016;:37.
https://hdl.handle.net/21.15107/rcub_rimsi_2079 .

Vukašinović, Jelena, Babic, Nikolina, Todorović, Tamara, Filipović, Nenad, "Synthesis, characterization and biological activity of platinum(II) and palladium(II) complexes with quinoline derivatives of thiosemicarbazones" in 4th Conference of Young Chemists of Serbia, 5 November, 2016, Belgrade, Serbia (2016):37,
https://hdl.handle.net/21.15107/rcub_rimsi_2079 .

TY  - CONF
AU  - Vukašinović, Jelena
AU  - Filipović, Nenad
AU  - Todorović, Tamara
PY  - 2015
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2087
AB  - Three new complexes of cobalt with chalcogensemicarbazones of 8-quinolinecarboxaldehyde were synthesized and characterized by X-ray analysis, elemental analysis, NMR, IR spectroscopy and molar conductivity and magnetic moment measurements. The aim of this study was to understand the ways of coordination chalcogensemicarbazones to the metal ion. The complexes have the following formulas: [Co (H8qasc) 2] Cl2 · 2H2O (1), [Co (8qatsc) 2] ClO4 ·
DMSO (2), [Co (8qasesc) 2] ClO4 · DMSO (3). All three complexes are prepared by the condensation reaction of 8-quinolinecarboxaldehyde with suitable chalcogensemicarbazones in a solution of ethanol and recrystallization of the product from the methanol in complex 1, while in the complex, 2 and 3, the product recrystallized ethanol vapor diffusion method in DMSO to a solution of the crude product. As products of the recrystallization of the resulting crystals of the complex. The geometry of all three complexes is octahedral, where ligands are coordinated to a
tridentately via the quinoline and imine nitrogen atoms and chalcogen atoms where in each of them with a metal ion being forming according to a five-membered and a six-membered ring. In the complex 1 Two ligands in neutral form are coordinated to Co(II) ion, outside the sphere constructed of two chloride anions and two molecules of water. In the complex 2 and 3, the two corresponding ligands are coordinated in monoanionic form, perchlorate anion and molecules DMSO are situated in the outer sphere of the complex. All the complexes showed significantly higher antimicrobial and cytotoxic activity compering to the ligands.
Keywords: cobalt, chalcogensemicarbazones X-ray, single crystals, antimicrobial.
PB  - Serbian Chemical Society
C3  - 3rd Conference of Young Chemists of Serbia, 24 October, 2015, Belgrade, Serbia
T1  - Synthesis and X-ray structural analysis of complex formation with chalcogensemicarbazones of 8-quinolinecarboxaldehyde
SP  - 52
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2087
ER  - 

@conference{
author = "Vukašinović, Jelena and Filipović, Nenad and Todorović, Tamara",
year = "2015",
abstract = "Three new complexes of cobalt with chalcogensemicarbazones of 8-quinolinecarboxaldehyde were synthesized and characterized by X-ray analysis, elemental analysis, NMR, IR spectroscopy and molar conductivity and magnetic moment measurements. The aim of this study was to understand the ways of coordination chalcogensemicarbazones to the metal ion. The complexes have the following formulas: [Co (H8qasc) 2] Cl2 · 2H2O (1), [Co (8qatsc) 2] ClO4 ·
DMSO (2), [Co (8qasesc) 2] ClO4 · DMSO (3). All three complexes are prepared by the condensation reaction of 8-quinolinecarboxaldehyde with suitable chalcogensemicarbazones in a solution of ethanol and recrystallization of the product from the methanol in complex 1, while in the complex, 2 and 3, the product recrystallized ethanol vapor diffusion method in DMSO to a solution of the crude product. As products of the recrystallization of the resulting crystals of the complex. The geometry of all three complexes is octahedral, where ligands are coordinated to a
tridentately via the quinoline and imine nitrogen atoms and chalcogen atoms where in each of them with a metal ion being forming according to a five-membered and a six-membered ring. In the complex 1 Two ligands in neutral form are coordinated to Co(II) ion, outside the sphere constructed of two chloride anions and two molecules of water. In the complex 2 and 3, the two corresponding ligands are coordinated in monoanionic form, perchlorate anion and molecules DMSO are situated in the outer sphere of the complex. All the complexes showed significantly higher antimicrobial and cytotoxic activity compering to the ligands.
Keywords: cobalt, chalcogensemicarbazones X-ray, single crystals, antimicrobial.",
publisher = "Serbian Chemical Society",
journal = "3rd Conference of Young Chemists of Serbia, 24 October, 2015, Belgrade, Serbia",
title = "Synthesis and X-ray structural analysis of complex formation with chalcogensemicarbazones of 8-quinolinecarboxaldehyde",
pages = "52",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2087"
}

Vukašinović, J., Filipović, N.,& Todorović, T.. (2015). Synthesis and X-ray structural analysis of complex formation with chalcogensemicarbazones of 8-quinolinecarboxaldehyde. in 3rd Conference of Young Chemists of Serbia, 24 October, 2015, Belgrade, Serbia
Serbian Chemical Society., 52.
https://hdl.handle.net/21.15107/rcub_rimsi_2087

Vukašinović J, Filipović N, Todorović T. Synthesis and X-ray structural analysis of complex formation with chalcogensemicarbazones of 8-quinolinecarboxaldehyde. in 3rd Conference of Young Chemists of Serbia, 24 October, 2015, Belgrade, Serbia. 2015;:52.
https://hdl.handle.net/21.15107/rcub_rimsi_2087 .

Vukašinović, Jelena, Filipović, Nenad, Todorović, Tamara, "Synthesis and X-ray structural analysis of complex formation with chalcogensemicarbazones of 8-quinolinecarboxaldehyde" in 3rd Conference of Young Chemists of Serbia, 24 October, 2015, Belgrade, Serbia (2015):52,
https://hdl.handle.net/21.15107/rcub_rimsi_2087 .