TY  - CONF
AU  - Malič, Barbara
AU  - Vojisavljević, Katarina
AU  - Pečnik, Tanja
AU  - Uršič, Hana
AU  - Matavž, Aleksander
AU  - Bobnar, Vid
AU  - Kutnjak, Zdravko
PY  - 2017
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/3034
AB  - Potassium sodium niobate, K0.5Na0.5NbO3 (KNN) is an environment-friendly lead-free alternative to highly efficient lead-based piezoelectrics. The poor functional properties of the KNN thin films prepared by chemical solution deposition are frequently related to the volatilisation of alkali species during processing, which hinders control over the stoichiometry, contributes to formation of secondary phases and deterioration of the microstructure. The problem can be overcome by adding alkalis in excess and/or by partial substitution of the A- and B- site atoms, such as in the case of the solid state synthesized KNN ceramics. Therefore, in this contribution, the influence of the alkaline-earth A- site dopant, Sr2+ on the microstructure, structure, and functional properties were examined for the solution-derived KNN thin films with alkaline excess. 
Liquid precursors of (K0.5Na0.5)1-ySryNbO3 (KNN-ySr) thin-films, where the Sr- dopant content was set at y = 0, 0.005, 0.01, were prepared from potassium and sodium acetates and niobium ethoxide in 2-methoxyethanol solvent with 5 mol% of potassium acetate excess. Strontium was introduced as acetate or nitrate. The approximately 250 nm thick KNN-ySr thin films on Pt/TiOx/SiO2/Si substrates were obtained by rapid thermal annealing at 650 oC for 5 min. 
According to X-ray diffraction analysis, all synthesized KNN thin films crystallize in pure perovskite phase with random orientation. The surface and cross-section microstructure analysis, performed by the field emission scanning electron microscopy, reveals that the KNN-ySr films consist of equiaxed grains, the average size of which gradually decreases from about 90 nm to a few tens of nm by increasing the Sr-dopant content. In the contribution we discuss the influence of the chemical modification on the functional response, i.e., dielectric properties versus frequency and temperature, polarisation – electric field dependence, leakage current and piezoelectric response of the as-prepared films.
C3  - E-MRS 2017 Spring Meeting & Exhibit, May 22 to 26, 2017, Strasbourg, France
T1  - Strontium-doping effects in solution derived lead-free ferroelectric K(0.5)Na(0.5)NbO3 thin films
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_3034
ER  - 

@conference{
author = "Malič, Barbara and Vojisavljević, Katarina and Pečnik, Tanja and Uršič, Hana and Matavž, Aleksander and Bobnar, Vid and Kutnjak, Zdravko",
year = "2017",
abstract = "Potassium sodium niobate, K0.5Na0.5NbO3 (KNN) is an environment-friendly lead-free alternative to highly efficient lead-based piezoelectrics. The poor functional properties of the KNN thin films prepared by chemical solution deposition are frequently related to the volatilisation of alkali species during processing, which hinders control over the stoichiometry, contributes to formation of secondary phases and deterioration of the microstructure. The problem can be overcome by adding alkalis in excess and/or by partial substitution of the A- and B- site atoms, such as in the case of the solid state synthesized KNN ceramics. Therefore, in this contribution, the influence of the alkaline-earth A- site dopant, Sr2+ on the microstructure, structure, and functional properties were examined for the solution-derived KNN thin films with alkaline excess. 
Liquid precursors of (K0.5Na0.5)1-ySryNbO3 (KNN-ySr) thin-films, where the Sr- dopant content was set at y = 0, 0.005, 0.01, were prepared from potassium and sodium acetates and niobium ethoxide in 2-methoxyethanol solvent with 5 mol% of potassium acetate excess. Strontium was introduced as acetate or nitrate. The approximately 250 nm thick KNN-ySr thin films on Pt/TiOx/SiO2/Si substrates were obtained by rapid thermal annealing at 650 oC for 5 min. 
According to X-ray diffraction analysis, all synthesized KNN thin films crystallize in pure perovskite phase with random orientation. The surface and cross-section microstructure analysis, performed by the field emission scanning electron microscopy, reveals that the KNN-ySr films consist of equiaxed grains, the average size of which gradually decreases from about 90 nm to a few tens of nm by increasing the Sr-dopant content. In the contribution we discuss the influence of the chemical modification on the functional response, i.e., dielectric properties versus frequency and temperature, polarisation – electric field dependence, leakage current and piezoelectric response of the as-prepared films.",
journal = "E-MRS 2017 Spring Meeting & Exhibit, May 22 to 26, 2017, Strasbourg, France",
title = "Strontium-doping effects in solution derived lead-free ferroelectric K(0.5)Na(0.5)NbO3 thin films",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_3034"
}

Malič, B., Vojisavljević, K., Pečnik, T., Uršič, H., Matavž, A., Bobnar, V.,& Kutnjak, Z.. (2017). Strontium-doping effects in solution derived lead-free ferroelectric K(0.5)Na(0.5)NbO3 thin films. in E-MRS 2017 Spring Meeting & Exhibit, May 22 to 26, 2017, Strasbourg, France.
https://hdl.handle.net/21.15107/rcub_rimsi_3034

Malič B, Vojisavljević K, Pečnik T, Uršič H, Matavž A, Bobnar V, Kutnjak Z. Strontium-doping effects in solution derived lead-free ferroelectric K(0.5)Na(0.5)NbO3 thin films. in E-MRS 2017 Spring Meeting & Exhibit, May 22 to 26, 2017, Strasbourg, France. 2017;.
https://hdl.handle.net/21.15107/rcub_rimsi_3034 .

Malič, Barbara, Vojisavljević, Katarina, Pečnik, Tanja, Uršič, Hana, Matavž, Aleksander, Bobnar, Vid, Kutnjak, Zdravko, "Strontium-doping effects in solution derived lead-free ferroelectric K(0.5)Na(0.5)NbO3 thin films" in E-MRS 2017 Spring Meeting & Exhibit, May 22 to 26, 2017, Strasbourg, France (2017),
https://hdl.handle.net/21.15107/rcub_rimsi_3034 .

TY  - CONF
AU  - Vojisavljević, Katarina
AU  - Pečnik, Tanja
AU  - Uršič, Hana
AU  - Malič, Barbara
PY  - 2017
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2314
AB  - The interest for the lead-free materials rapidly increased after 2003, when the
legislation against the use of lead-based piezoelectric materials in electronics had
passed. Among the numerous lead-free materials, special attention was paid to some
compositions of potassium sodium niobate solid solutions, K0.5Na0.5NbO3 (KNN)
obtained by a partial replacement of A- and B- site atoms from the perovskite KNN
crystal lattice with dopants, which in the form of ceramic showed excellent
piezoelectric and ferroelectric properties. Driven by the miniaturization and
integration into sensors and energy harvesters, great efforts have been also made in
processing of high quality KNN thin films.
In this contribution, the effects of the A-site doping of KNN films with Sr
(KNN-xSr) on the microstructure and electrical properties were investigated for the
first time. For that purpose, liquid precursors of (K0.5Na0.5)1-xSrxNbO3 (KNN-xSr, x
= 0, 0.005, 0.01) thin-films, were prepared from potassium and sodium acetates,
niobium ethoxide and an appropriate amount of strontium nitrate in 2-
methoxyethanol solvent with 5 mol% of potassium acetate excess. The
approximately 250 nm thick KNN-xSr thin films on Pt(111)/TiOx/SiO2/Si substrates
were obtained through repeated spin-coating and pyrolysis steps, followed by the
rapid thermal annealing at 650 °C.
All KNN films crystallized in pure perovskite structure with (100) preferential
orientation, which became more pronounced in doped films, as confirmed by the
Lotgering factor. The addition of 1 mole% Sr dopant, however, effectively reduced
the leakage current density to 4.2·10-8 A/cm2 at the electric field of 100 kV/cm and
contributed to the well-saturated ferroelectric hysteresis loop of the film. The major
drawback of this film was in the low piezoelectric response (a few pm/V measured
by piezoresponse force microscopy) and inability to switch ferroelectric polarization
by electric field, which can be related to the defects, such as oxygen vacancies. To
overcome the problem, an improved synthesis of the KNN-1Sr films with 1 mole%
Mn was introduced. The reasons for decrease in the leakage current density and
improvement of piezoelectric response will be discussed.
PB  - Institute for Multidisciplinary Research, University of Belgrade
C3  - 4th Conference of Serbian Society for Ceramic Materials
T1  - ENHANCED LOCAL PIEZOELECRTIC RESPONSE IN Mn- DOPED (K0.5Na0.5)0.99Sr0.01NbO3 FILMS
EP  - 64
SP  - 64
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2314
ER  - 

@conference{
author = "Vojisavljević, Katarina and Pečnik, Tanja and Uršič, Hana and Malič, Barbara",
year = "2017",
abstract = "The interest for the lead-free materials rapidly increased after 2003, when the
legislation against the use of lead-based piezoelectric materials in electronics had
passed. Among the numerous lead-free materials, special attention was paid to some
compositions of potassium sodium niobate solid solutions, K0.5Na0.5NbO3 (KNN)
obtained by a partial replacement of A- and B- site atoms from the perovskite KNN
crystal lattice with dopants, which in the form of ceramic showed excellent
piezoelectric and ferroelectric properties. Driven by the miniaturization and
integration into sensors and energy harvesters, great efforts have been also made in
processing of high quality KNN thin films.
In this contribution, the effects of the A-site doping of KNN films with Sr
(KNN-xSr) on the microstructure and electrical properties were investigated for the
first time. For that purpose, liquid precursors of (K0.5Na0.5)1-xSrxNbO3 (KNN-xSr, x
= 0, 0.005, 0.01) thin-films, were prepared from potassium and sodium acetates,
niobium ethoxide and an appropriate amount of strontium nitrate in 2-
methoxyethanol solvent with 5 mol% of potassium acetate excess. The
approximately 250 nm thick KNN-xSr thin films on Pt(111)/TiOx/SiO2/Si substrates
were obtained through repeated spin-coating and pyrolysis steps, followed by the
rapid thermal annealing at 650 °C.
All KNN films crystallized in pure perovskite structure with (100) preferential
orientation, which became more pronounced in doped films, as confirmed by the
Lotgering factor. The addition of 1 mole% Sr dopant, however, effectively reduced
the leakage current density to 4.2·10-8 A/cm2 at the electric field of 100 kV/cm and
contributed to the well-saturated ferroelectric hysteresis loop of the film. The major
drawback of this film was in the low piezoelectric response (a few pm/V measured
by piezoresponse force microscopy) and inability to switch ferroelectric polarization
by electric field, which can be related to the defects, such as oxygen vacancies. To
overcome the problem, an improved synthesis of the KNN-1Sr films with 1 mole%
Mn was introduced. The reasons for decrease in the leakage current density and
improvement of piezoelectric response will be discussed.",
publisher = "Institute for Multidisciplinary Research, University of Belgrade",
journal = "4th Conference of Serbian Society for Ceramic Materials",
title = "ENHANCED LOCAL PIEZOELECRTIC RESPONSE IN Mn- DOPED (K0.5Na0.5)0.99Sr0.01NbO3 FILMS",
pages = "64-64",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2314"
}

Vojisavljević, K., Pečnik, T., Uršič, H.,& Malič, B.. (2017). ENHANCED LOCAL PIEZOELECRTIC RESPONSE IN Mn- DOPED (K0.5Na0.5)0.99Sr0.01NbO3 FILMS. in 4th Conference of Serbian Society for Ceramic Materials
Institute for Multidisciplinary Research, University of Belgrade., 64-64.
https://hdl.handle.net/21.15107/rcub_rimsi_2314

Vojisavljević K, Pečnik T, Uršič H, Malič B. ENHANCED LOCAL PIEZOELECRTIC RESPONSE IN Mn- DOPED (K0.5Na0.5)0.99Sr0.01NbO3 FILMS. in 4th Conference of Serbian Society for Ceramic Materials. 2017;:64-64.
https://hdl.handle.net/21.15107/rcub_rimsi_2314 .

Vojisavljević, Katarina, Pečnik, Tanja, Uršič, Hana, Malič, Barbara, "ENHANCED LOCAL PIEZOELECRTIC RESPONSE IN Mn- DOPED (K0.5Na0.5)0.99Sr0.01NbO3 FILMS" in 4th Conference of Serbian Society for Ceramic Materials (2017):64-64,
https://hdl.handle.net/21.15107/rcub_rimsi_2314 .

TY  - CONF
AU  - Vojisavljević, Katarina
AU  - Kurinčič, Nika
AU  - Uršič, Hana
AU  - Matavž, Aleksander
AU  - Bobnar, Vid
AU  - Malič, Barbara
PY  - 2016
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2899
C3  - 2016 IEEE International Symposium on Applications of Ferroelectrics
T1  - Influence of strontium doping on microstructure and functional properties of lead-free piezoelectric K[sub](0.5)Na[sub](0.5)NbO[sub]3 thin films
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2899
ER  - 

@conference{
author = "Vojisavljević, Katarina and Kurinčič, Nika and Uršič, Hana and Matavž, Aleksander and Bobnar, Vid and Malič, Barbara",
year = "2016",
journal = "2016 IEEE International Symposium on Applications of Ferroelectrics",
title = "Influence of strontium doping on microstructure and functional properties of lead-free piezoelectric K[sub](0.5)Na[sub](0.5)NbO[sub]3 thin films",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2899"
}

Vojisavljević, K., Kurinčič, N., Uršič, H., Matavž, A., Bobnar, V.,& Malič, B.. (2016). Influence of strontium doping on microstructure and functional properties of lead-free piezoelectric K[sub](0.5)Na[sub](0.5)NbO[sub]3 thin films. in 2016 IEEE International Symposium on Applications of Ferroelectrics.
https://hdl.handle.net/21.15107/rcub_rimsi_2899

Vojisavljević K, Kurinčič N, Uršič H, Matavž A, Bobnar V, Malič B. Influence of strontium doping on microstructure and functional properties of lead-free piezoelectric K[sub](0.5)Na[sub](0.5)NbO[sub]3 thin films. in 2016 IEEE International Symposium on Applications of Ferroelectrics. 2016;.
https://hdl.handle.net/21.15107/rcub_rimsi_2899 .

Vojisavljević, Katarina, Kurinčič, Nika, Uršič, Hana, Matavž, Aleksander, Bobnar, Vid, Malič, Barbara, "Influence of strontium doping on microstructure and functional properties of lead-free piezoelectric K[sub](0.5)Na[sub](0.5)NbO[sub]3 thin films" in 2016 IEEE International Symposium on Applications of Ferroelectrics (2016),
https://hdl.handle.net/21.15107/rcub_rimsi_2899 .

TY  - CONF
AU  - Vojisavljević, Katarina
AU  - Pečnik, Tanja
AU  - Uršič, Hana
AU  - Matavž, Aleksander
AU  - Bobnar, Vid
AU  - Malič, Barbara
PY  - 2016
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2894
AB  - The legislation against the use of lead-based piezoelectric materials in electronics has stimulated an increased research in the field of the lead-free piezoelectric ceramics and thin films after 2003. Among lead-free materials, special attention was paid to some compositions of potassium sodium niobate solid solution, K0.5Na0.5NbO3 (KNN) obtained by a partial replacement of A- and B- site atoms from the perovskite KNN crystal lattice with dopants. Excellent piezoelectric and ferroelectric properties of chemically modified KNN ceramics indicate that they can be used as the efficient lead-free counterparts to lead-based piezoelectrics.
Although A-site doping of KNN ceramics with low amounts of alkaline earths (Ca2+, Sr2+, Ba2+), particularly with Sr2+ was reported as an useful way in improvement of their density and electrical properties [1, 2], there is no literature data concerning the microstructure and functional properties of KNN thin films influenced by the same chemical modification.
In this contribution, liquid precursors of (K0.5Na0.5)1-ySryNbO3 (KNN-ySr) thin-films, where the Sr- dopant content was set at y = 0, 0.005, 0.01, were prepared from potassium and sodium acetates and niobium ethoxide in 2-methoxyethanol solvent with 5 mole % of potassium acetate excess, and an appropriate amount of strontium acetate dissolved in acetic acid. The approximately 250 nm thick KNN-ySr thin films on Pt/TiOx/SiO2/Si substrates were obtained through repeated spin-coating and pyrolysis steps at 300 oC for 2 min, followed by the rapid thermal annealing at 650 oC in air flow for 5 min with a heating rate of 12 K/s.
According to X-ray diffraction analysis, all of the synthesized KNN thin films crystallize in pure perovskite phase with (100) preferential orientation. The surface and cross-section microstructure analysis, performed by the field emission scanning electron microscopy, reveals that the KNN-ySr films consist of equiaxed grains, the average size of which gradually decreases from about 90 nm to a few tens of nm by increasing the Sr-dopant content. Dielectric properties versus frequency, polarisation – electric field dependence and leakage current were followed in order to get information on how the Sr-dopant content influences the functional properties of the as-prepared films. In addition, the topography and the local piezoelectric response of the KNN-ySr films were analysed by atomic force microscopy coupled with a PFM mode.
References:
[1] B. Malič, J. Bernard, J. Holc, D. Jenko, M. Kosec, Alkaline-earth doping in (K,Na)NbO3 based piezoceramics, J. Eur. Ceram. Soc. 25 (2005) 2707-2711.
[2] M. Demartin Maeder, D. Damjanović, N. Setter, Lead free piezoelectric materials, J. Electroceram. 13 (2004) 385-392.
PB  - Ljubljana, Slovenia/Jožef Stefan Institute
C3  - COST TO-BE. Fall Meeting
T1  - Microstructure and functional properties of Sr-doped K0.5Na0.5NbO3 thin films
EP  - 89
SP  - 89
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2894
ER  - 

@conference{
author = "Vojisavljević, Katarina and Pečnik, Tanja and Uršič, Hana and Matavž, Aleksander and Bobnar, Vid and Malič, Barbara",
year = "2016",
abstract = "The legislation against the use of lead-based piezoelectric materials in electronics has stimulated an increased research in the field of the lead-free piezoelectric ceramics and thin films after 2003. Among lead-free materials, special attention was paid to some compositions of potassium sodium niobate solid solution, K0.5Na0.5NbO3 (KNN) obtained by a partial replacement of A- and B- site atoms from the perovskite KNN crystal lattice with dopants. Excellent piezoelectric and ferroelectric properties of chemically modified KNN ceramics indicate that they can be used as the efficient lead-free counterparts to lead-based piezoelectrics.
Although A-site doping of KNN ceramics with low amounts of alkaline earths (Ca2+, Sr2+, Ba2+), particularly with Sr2+ was reported as an useful way in improvement of their density and electrical properties [1, 2], there is no literature data concerning the microstructure and functional properties of KNN thin films influenced by the same chemical modification.
In this contribution, liquid precursors of (K0.5Na0.5)1-ySryNbO3 (KNN-ySr) thin-films, where the Sr- dopant content was set at y = 0, 0.005, 0.01, were prepared from potassium and sodium acetates and niobium ethoxide in 2-methoxyethanol solvent with 5 mole % of potassium acetate excess, and an appropriate amount of strontium acetate dissolved in acetic acid. The approximately 250 nm thick KNN-ySr thin films on Pt/TiOx/SiO2/Si substrates were obtained through repeated spin-coating and pyrolysis steps at 300 oC for 2 min, followed by the rapid thermal annealing at 650 oC in air flow for 5 min with a heating rate of 12 K/s.
According to X-ray diffraction analysis, all of the synthesized KNN thin films crystallize in pure perovskite phase with (100) preferential orientation. The surface and cross-section microstructure analysis, performed by the field emission scanning electron microscopy, reveals that the KNN-ySr films consist of equiaxed grains, the average size of which gradually decreases from about 90 nm to a few tens of nm by increasing the Sr-dopant content. Dielectric properties versus frequency, polarisation – electric field dependence and leakage current were followed in order to get information on how the Sr-dopant content influences the functional properties of the as-prepared films. In addition, the topography and the local piezoelectric response of the KNN-ySr films were analysed by atomic force microscopy coupled with a PFM mode.
References:
[1] B. Malič, J. Bernard, J. Holc, D. Jenko, M. Kosec, Alkaline-earth doping in (K,Na)NbO3 based piezoceramics, J. Eur. Ceram. Soc. 25 (2005) 2707-2711.
[2] M. Demartin Maeder, D. Damjanović, N. Setter, Lead free piezoelectric materials, J. Electroceram. 13 (2004) 385-392.",
publisher = "Ljubljana, Slovenia/Jožef Stefan Institute",
journal = "COST TO-BE. Fall Meeting",
title = "Microstructure and functional properties of Sr-doped K0.5Na0.5NbO3 thin films",
pages = "89-89",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2894"
}

Vojisavljević, K., Pečnik, T., Uršič, H., Matavž, A., Bobnar, V.,& Malič, B.. (2016). Microstructure and functional properties of Sr-doped K0.5Na0.5NbO3 thin films. in COST TO-BE. Fall Meeting
Ljubljana, Slovenia/Jožef Stefan Institute., 89-89.
https://hdl.handle.net/21.15107/rcub_rimsi_2894

Vojisavljević K, Pečnik T, Uršič H, Matavž A, Bobnar V, Malič B. Microstructure and functional properties of Sr-doped K0.5Na0.5NbO3 thin films. in COST TO-BE. Fall Meeting. 2016;:89-89.
https://hdl.handle.net/21.15107/rcub_rimsi_2894 .

Vojisavljević, Katarina, Pečnik, Tanja, Uršič, Hana, Matavž, Aleksander, Bobnar, Vid, Malič, Barbara, "Microstructure and functional properties of Sr-doped K0.5Na0.5NbO3 thin films" in COST TO-BE. Fall Meeting (2016):89-89,
https://hdl.handle.net/21.15107/rcub_rimsi_2894 .

TY  - CONF
AU  - Baratto, Camilla
AU  - Hemmatzadeh, Saeedabad
AU  - Rigoni, Federica
AU  - Comini, Elisabetta
AU  - Faglia, Guido
AU  - sberveglieri, veronica
AU  - Vojisavljević, Katarina
AU  - Malič, Barbara
AU  - Sberveglieri, Giorgio
PY  - 2016
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/3044
AB  - Zinc and Tin oxide is a promising In and Ga-free transparent semiconductors that demonstrated great potential as transparent conducting oxides in application like photovoltaic devices, flat panel displays, solar cells, due to its high electron mobility, high electrical conductivity, and low visible absorption [1 ]. Zn2SnO4 can also be applied to the field of gas sensing, if the resistance of the material is appropriate, that is not too conducting. We prepared Zn2SnO4 thin films by RF sputtering starting from sintered ceramic target with Zn:Sn ratio 2:1, investigation the influence of deposition parameters (oxygen content and substrate temperature) during deposition on the thin film properties. Amorphous films are obtained for deposition temperature up to 400°C, but they become crystalline (Zn2SnO4) after proper annealing treatment higher than 600°C. Annealing in air and in Ar resulted in porous film that are suitable for gas sensing. All films are transparent before and after annealing. We investigated optical properties of thin films by UV-VIS, Raman and photoluminescence spectroscopy and functional properties of thin films for gas sensing applications. The material demonstrated to have high potential for ethanol sensing of at 400°C and acetone at 300°C. Ternary thin films find also application in electronic nose for food analysis. References [1] Coutts TJ, Young DL, Li X, Mulligan WP, Wu X, J Vac Sci Technol 2000, A 18:2646?2660
C3  - E-MRS 2016 Spring Meeting, May 2nd-6th, 2016, Lille, France
T1  - From transparent conducting oxide to gas sensing applications of inverse spinel zinc stannate
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_3044
ER  - 

@conference{
author = "Baratto, Camilla and Hemmatzadeh, Saeedabad and Rigoni, Federica and Comini, Elisabetta and Faglia, Guido and sberveglieri, veronica and Vojisavljević, Katarina and Malič, Barbara and Sberveglieri, Giorgio",
year = "2016",
abstract = "Zinc and Tin oxide is a promising In and Ga-free transparent semiconductors that demonstrated great potential as transparent conducting oxides in application like photovoltaic devices, flat panel displays, solar cells, due to its high electron mobility, high electrical conductivity, and low visible absorption [1 ]. Zn2SnO4 can also be applied to the field of gas sensing, if the resistance of the material is appropriate, that is not too conducting. We prepared Zn2SnO4 thin films by RF sputtering starting from sintered ceramic target with Zn:Sn ratio 2:1, investigation the influence of deposition parameters (oxygen content and substrate temperature) during deposition on the thin film properties. Amorphous films are obtained for deposition temperature up to 400°C, but they become crystalline (Zn2SnO4) after proper annealing treatment higher than 600°C. Annealing in air and in Ar resulted in porous film that are suitable for gas sensing. All films are transparent before and after annealing. We investigated optical properties of thin films by UV-VIS, Raman and photoluminescence spectroscopy and functional properties of thin films for gas sensing applications. The material demonstrated to have high potential for ethanol sensing of at 400°C and acetone at 300°C. Ternary thin films find also application in electronic nose for food analysis. References [1] Coutts TJ, Young DL, Li X, Mulligan WP, Wu X, J Vac Sci Technol 2000, A 18:2646?2660",
journal = "E-MRS 2016 Spring Meeting, May 2nd-6th, 2016, Lille, France",
title = "From transparent conducting oxide to gas sensing applications of inverse spinel zinc stannate",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_3044"
}

Baratto, C., Hemmatzadeh, S., Rigoni, F., Comini, E., Faglia, G., sberveglieri, v., Vojisavljević, K., Malič, B.,& Sberveglieri, G.. (2016). From transparent conducting oxide to gas sensing applications of inverse spinel zinc stannate. in E-MRS 2016 Spring Meeting, May 2nd-6th, 2016, Lille, France.
https://hdl.handle.net/21.15107/rcub_rimsi_3044

Baratto C, Hemmatzadeh S, Rigoni F, Comini E, Faglia G, sberveglieri V, Vojisavljević K, Malič B, Sberveglieri G. From transparent conducting oxide to gas sensing applications of inverse spinel zinc stannate. in E-MRS 2016 Spring Meeting, May 2nd-6th, 2016, Lille, France. 2016;.
https://hdl.handle.net/21.15107/rcub_rimsi_3044 .

Baratto, Camilla, Hemmatzadeh, Saeedabad, Rigoni, Federica, Comini, Elisabetta, Faglia, Guido, sberveglieri, veronica, Vojisavljević, Katarina, Malič, Barbara, Sberveglieri, Giorgio, "From transparent conducting oxide to gas sensing applications of inverse spinel zinc stannate" in E-MRS 2016 Spring Meeting, May 2nd-6th, 2016, Lille, France (2016),
https://hdl.handle.net/21.15107/rcub_rimsi_3044 .

TY  - CONF
AU  - Bertoncelj, Barbara
AU  - Vojisavljević, Katarina
AU  - Rihtaršič, Janez
AU  - Trefalt, Gregor
AU  - Malič, Barbara
PY  - 2016
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2903
AB  - In this study, the influence of the glass fiber (GF) content on the
microstructure and flexural strength of bulk molding compounds (BMCs) is
investigated. Three sets of BMCs with different weight fractions of GF
(5/10/12.5 wt%) were commercially prepared and compression molded into test
specimens. The microstructure of the composites was analysed by scanning
electron microscopy and further quantitatively characterized by Voronoi analysis
in order to define the degree of the fiber distribution homogeneity. The
experimental results were compared to the modelled microstructures. The results
revealed that the fiber distribution in the composite with 5 wt% of GF is
considered as the most homogeneous. Through the obtained microstructural
descriptors, the fiber weight content and their distribution were correlated to the
flexural strength of BMCs. The flexural strength was the highest for the
composite with 10 wt% of GF.
PB  - Mednarodna podiplomska šola Jožefa Stefana, Ljubljana
C3  - 8. ŠTUDENTSKA KONFERENCA MEDNARODNE PODIPLOMSKE ŠOLE JOŽEFA STEFANA
T1  - Microstructural analysis of Bulk Molding Compounds and correlation with the flexural strength
EP  - 12
IS  - 1
SP  - 3
VL  - 1
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2903
ER  - 

@conference{
author = "Bertoncelj, Barbara and Vojisavljević, Katarina and Rihtaršič, Janez and Trefalt, Gregor and Malič, Barbara",
year = "2016",
abstract = "In this study, the influence of the glass fiber (GF) content on the
microstructure and flexural strength of bulk molding compounds (BMCs) is
investigated. Three sets of BMCs with different weight fractions of GF
(5/10/12.5 wt%) were commercially prepared and compression molded into test
specimens. The microstructure of the composites was analysed by scanning
electron microscopy and further quantitatively characterized by Voronoi analysis
in order to define the degree of the fiber distribution homogeneity. The
experimental results were compared to the modelled microstructures. The results
revealed that the fiber distribution in the composite with 5 wt% of GF is
considered as the most homogeneous. Through the obtained microstructural
descriptors, the fiber weight content and their distribution were correlated to the
flexural strength of BMCs. The flexural strength was the highest for the
composite with 10 wt% of GF.",
publisher = "Mednarodna podiplomska šola Jožefa Stefana, Ljubljana",
journal = "8. ŠTUDENTSKA KONFERENCA MEDNARODNE PODIPLOMSKE ŠOLE JOŽEFA STEFANA",
title = "Microstructural analysis of Bulk Molding Compounds and correlation with the flexural strength",
pages = "12-3",
number = "1",
volume = "1",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2903"
}

Bertoncelj, B., Vojisavljević, K., Rihtaršič, J., Trefalt, G.,& Malič, B.. (2016). Microstructural analysis of Bulk Molding Compounds and correlation with the flexural strength. in 8. ŠTUDENTSKA KONFERENCA MEDNARODNE PODIPLOMSKE ŠOLE JOŽEFA STEFANA
Mednarodna podiplomska šola Jožefa Stefana, Ljubljana., 1(1), 3-12.
https://hdl.handle.net/21.15107/rcub_rimsi_2903

Bertoncelj B, Vojisavljević K, Rihtaršič J, Trefalt G, Malič B. Microstructural analysis of Bulk Molding Compounds and correlation with the flexural strength. in 8. ŠTUDENTSKA KONFERENCA MEDNARODNE PODIPLOMSKE ŠOLE JOŽEFA STEFANA. 2016;1(1):3-12.
https://hdl.handle.net/21.15107/rcub_rimsi_2903 .

Bertoncelj, Barbara, Vojisavljević, Katarina, Rihtaršič, Janez, Trefalt, Gregor, Malič, Barbara, "Microstructural analysis of Bulk Molding Compounds and correlation with the flexural strength" in 8. ŠTUDENTSKA KONFERENCA MEDNARODNE PODIPLOMSKE ŠOLE JOŽEFA STEFANA, 1, no. 1 (2016):3-12,
https://hdl.handle.net/21.15107/rcub_rimsi_2903 .

TY  - CONF
AU  - Vojisavljević, Katarina
AU  - Benčan Golob, Andreja
AU  - Cilenšek, Jena
AU  - Malič, Barbara
PY  - 2015
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/3025
AB  - Over the past two decades, a considerable effort has been devoted to research of the p-type semiconducting materials, which found diverse applications in industry. As the p-type material with a spinel AB2O4 structure and direct optical band gap of 2.19 eV, cobalt oxide, Co3O4 has drawn special interests in gas-sensing and solar energy absorption research community. At the same time, it has found the usage as an electrode material in lithium ion batteries, catalyst, ceramic pigment, field-emission and magnetic material. A powerful strategy to improve the Co3O4 performances in some of the mentioned applications is the utilization of a nanocrystalline powder with a high surface to volume ratio, which can be successfully produced by self-propagation combustion reaction.
In this work, cobalt nitrate (oxidizer) and glycine (fuel) of required amounts were dissolved in the minimum amount of deionized water to obtain a clear solution. According to the rules of propellant chemistry, the glycine/metal ion ratio was adjusted to provide stoichiometric or fuel-lean conditions of the redox reaction. The sols were dried at 80 oC to obtain the gels, and then subjected to the rapid heating, where the gels auto-ignited at approximately 250 oC (depending on the amount of the fuel) and spontaneously underwent a smouldering combustion with evolution of large amounts of gases, subsequently forming a voluminous nanosized Co-oxide powder. 
It is worth to mention that the dual role of the glycine (chelating agent and fuel) in this synthesis was of great importance in preventing the precipitation of the solution during rapid heating, and in liberation of the required energy for the synthesis of the Co3O4 powder with desired Co+2/Co+3 oxidation state, necessary for its further use in production of gas sensors and catalysts. The processes involved in formation of the pure Co3O4 powder and especially the exothermicity of the reaction, were followed by simultaneous thermal analysis (thermogravimetric and differential thermal analysis coupled with evolved gas analysis). According to the X-ray diffraction analysis the phase-pure Co3O4 was obtained only when the precursor powder was prepared from the fuel-lean redox reaction. The field emission scanning electron micrographs revealed the spongy aspect of the calcined powder, where small primary particles formed the agglomerates. The transmission electron microscopy was used to get deeper insight in the particle size and purity of the as prepared nanosized powders. The formation of the single Co3O4 powder from the solution to the combusted powder was also analysed by Fourier transformed infra-red spectroscopy.
PB  - Central and Eastern European Committee for Thermal Analysis and Calorimetry, cop. 2015
C3  - 3rd Central and Eastern European Conference on Thermal Analysis and Calorimetry
T1  - Synthesis of nanocrystalline Co3O4 nanopowders via self-propagation combustion reaction
EP  - 281
SP  - 281
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_3025
ER  - 

@conference{
author = "Vojisavljević, Katarina and Benčan Golob, Andreja and Cilenšek, Jena and Malič, Barbara",
year = "2015",
abstract = "Over the past two decades, a considerable effort has been devoted to research of the p-type semiconducting materials, which found diverse applications in industry. As the p-type material with a spinel AB2O4 structure and direct optical band gap of 2.19 eV, cobalt oxide, Co3O4 has drawn special interests in gas-sensing and solar energy absorption research community. At the same time, it has found the usage as an electrode material in lithium ion batteries, catalyst, ceramic pigment, field-emission and magnetic material. A powerful strategy to improve the Co3O4 performances in some of the mentioned applications is the utilization of a nanocrystalline powder with a high surface to volume ratio, which can be successfully produced by self-propagation combustion reaction.
In this work, cobalt nitrate (oxidizer) and glycine (fuel) of required amounts were dissolved in the minimum amount of deionized water to obtain a clear solution. According to the rules of propellant chemistry, the glycine/metal ion ratio was adjusted to provide stoichiometric or fuel-lean conditions of the redox reaction. The sols were dried at 80 oC to obtain the gels, and then subjected to the rapid heating, where the gels auto-ignited at approximately 250 oC (depending on the amount of the fuel) and spontaneously underwent a smouldering combustion with evolution of large amounts of gases, subsequently forming a voluminous nanosized Co-oxide powder. 
It is worth to mention that the dual role of the glycine (chelating agent and fuel) in this synthesis was of great importance in preventing the precipitation of the solution during rapid heating, and in liberation of the required energy for the synthesis of the Co3O4 powder with desired Co+2/Co+3 oxidation state, necessary for its further use in production of gas sensors and catalysts. The processes involved in formation of the pure Co3O4 powder and especially the exothermicity of the reaction, were followed by simultaneous thermal analysis (thermogravimetric and differential thermal analysis coupled with evolved gas analysis). According to the X-ray diffraction analysis the phase-pure Co3O4 was obtained only when the precursor powder was prepared from the fuel-lean redox reaction. The field emission scanning electron micrographs revealed the spongy aspect of the calcined powder, where small primary particles formed the agglomerates. The transmission electron microscopy was used to get deeper insight in the particle size and purity of the as prepared nanosized powders. The formation of the single Co3O4 powder from the solution to the combusted powder was also analysed by Fourier transformed infra-red spectroscopy.",
publisher = "Central and Eastern European Committee for Thermal Analysis and Calorimetry, cop. 2015",
journal = "3rd Central and Eastern European Conference on Thermal Analysis and Calorimetry",
title = "Synthesis of nanocrystalline Co3O4 nanopowders via self-propagation combustion reaction",
pages = "281-281",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_3025"
}

Vojisavljević, K., Benčan Golob, A., Cilenšek, J.,& Malič, B.. (2015). Synthesis of nanocrystalline Co3O4 nanopowders via self-propagation combustion reaction. in 3rd Central and Eastern European Conference on Thermal Analysis and Calorimetry
Central and Eastern European Committee for Thermal Analysis and Calorimetry, cop. 2015., 281-281.
https://hdl.handle.net/21.15107/rcub_rimsi_3025

Vojisavljević K, Benčan Golob A, Cilenšek J, Malič B. Synthesis of nanocrystalline Co3O4 nanopowders via self-propagation combustion reaction. in 3rd Central and Eastern European Conference on Thermal Analysis and Calorimetry. 2015;:281-281.
https://hdl.handle.net/21.15107/rcub_rimsi_3025 .

Vojisavljević, Katarina, Benčan Golob, Andreja, Cilenšek, Jena, Malič, Barbara, "Synthesis of nanocrystalline Co3O4 nanopowders via self-propagation combustion reaction" in 3rd Central and Eastern European Conference on Thermal Analysis and Calorimetry (2015):281-281,
https://hdl.handle.net/21.15107/rcub_rimsi_3025 .

TY  - CONF
AU  - Vojisavljević, Katarina
AU  - Gartner, Mariuca
AU  - Jeglič, Peter
AU  - Arčon, Denis
AU  - Deluca, Marco
AU  - Malič, Barbara
PY  - 2015
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2915
AB  - Copper aluminate (CuAlO2) is the most extensively studied cuprous delafossite (general formula: A+B3+O2, group: R-3m) p-type semiconductor, whose exceptional electrical, optical, magnetic and catalytic properties found many applications in catalysis and (opto)electronic technology, e.g. as field electron emitters, light-emitting diodes, functional windows or solar cells. While the processing-property correlations have been well explored for many materials with perovskite or spinel structure, the investigations of the mentioned relationship for delafosittes are still eliciting the attention of scientists. In order to attain the optimized CuAlO2 material for a specific application, for example, as ceramic targets for further physical vapour deposition of thin films, the preparation routes should be precisely designed. The adequate synthesis parameters should allow the formation of pure CuAlO2 and disable its disproportionation to CuO and detrimental spinel CuAl2O4. For the spinel CuAl2O4 phase is known that can notably influence the final product properties, since it is an n-type material and insulator.  
Concerning the synthesis of CuAlO2 sputtering targets, our approach to process single-phase delafossite CuAlO2 has been to enhance the solid-state synthesis by milling of nano-boehmite AlOOH.xH2O and pre-milled Cu2O powders mixture, and to control the atmosphere both during the synthesis and sintering steps. The pure delafossite CuAlO2 powder was prepared by the double heating of the above mentioned powder mixture for 10 h at 1100 oC in argon atmosphere. A short sintering time of 2 h at 1100 oC in air atmosphere was essential to obtain single phase and dense CuAlO2 ceramic with 86 % of theoretical density. In contrast to X-ray analysis, which confirmed the single phase composition of the sintered sample, the BEI/EDXS analysis revealed the presence of traces of Cu-rich impurities at the surface of the pellet, while the bulk of the sample was single phase delafossite with uniformly distributed porosity. 
For further use, the sintered samples were cut and polished to remove the CuO from the surface. Beside the strong modes at 418 cm-1 and 767 cm-1, typical for delafossite structured CuAlO2, the low intensity features were also observed in the Raman spectrum of the sintered sample and could be mainly related to the leaning delafossite or 2H-CuAlO2 hexagonal polytype. Nominally pure CuAlO2 sample was analysed by electron paramagnetic resonance (EPR) and nuclear magnetic resonance (NMR) spectroscopy to get microscopic insight into composition of the sintered sample, i.e. presence of impurities within the bulk network. 
The semiconducting nature of the sintered sample was confirmed by the apparent increase of both dielectric permittivity and dielectric loss factor with increasing temperature and decrease with increasing frequency. Furthermore, the temperature dependence of the Hall parameters (resistivity-ρ, carrier concentration-ND, mobility-µ) of the CuAlO2 ceramic was analysed. The resistivity of the samples decreased with increasing temperature from 830 Ωcm at 230 K to 11 Ωcm at 350 K, due to the increase in both the number of charge carriers and their mobility. Also, room temperature Hall measurements revealed a positive Hall coefficient 
RH = 33.8 cm-3C-1, which confirmed the p-type conduction of the material. 
Within this contribution the relationship between processing, composition and properties of the CuAlO2 ceramic is discussed.
C3  - Conference of the European Ceramic Society XIV, Toledo
T1  - Processing-property relationship for solid-state synthesized CuAlO2 ceramic
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2915
ER  - 

@conference{
author = "Vojisavljević, Katarina and Gartner, Mariuca and Jeglič, Peter and Arčon, Denis and Deluca, Marco and Malič, Barbara",
year = "2015",
abstract = "Copper aluminate (CuAlO2) is the most extensively studied cuprous delafossite (general formula: A+B3+O2, group: R-3m) p-type semiconductor, whose exceptional electrical, optical, magnetic and catalytic properties found many applications in catalysis and (opto)electronic technology, e.g. as field electron emitters, light-emitting diodes, functional windows or solar cells. While the processing-property correlations have been well explored for many materials with perovskite or spinel structure, the investigations of the mentioned relationship for delafosittes are still eliciting the attention of scientists. In order to attain the optimized CuAlO2 material for a specific application, for example, as ceramic targets for further physical vapour deposition of thin films, the preparation routes should be precisely designed. The adequate synthesis parameters should allow the formation of pure CuAlO2 and disable its disproportionation to CuO and detrimental spinel CuAl2O4. For the spinel CuAl2O4 phase is known that can notably influence the final product properties, since it is an n-type material and insulator.  
Concerning the synthesis of CuAlO2 sputtering targets, our approach to process single-phase delafossite CuAlO2 has been to enhance the solid-state synthesis by milling of nano-boehmite AlOOH.xH2O and pre-milled Cu2O powders mixture, and to control the atmosphere both during the synthesis and sintering steps. The pure delafossite CuAlO2 powder was prepared by the double heating of the above mentioned powder mixture for 10 h at 1100 oC in argon atmosphere. A short sintering time of 2 h at 1100 oC in air atmosphere was essential to obtain single phase and dense CuAlO2 ceramic with 86 % of theoretical density. In contrast to X-ray analysis, which confirmed the single phase composition of the sintered sample, the BEI/EDXS analysis revealed the presence of traces of Cu-rich impurities at the surface of the pellet, while the bulk of the sample was single phase delafossite with uniformly distributed porosity. 
For further use, the sintered samples were cut and polished to remove the CuO from the surface. Beside the strong modes at 418 cm-1 and 767 cm-1, typical for delafossite structured CuAlO2, the low intensity features were also observed in the Raman spectrum of the sintered sample and could be mainly related to the leaning delafossite or 2H-CuAlO2 hexagonal polytype. Nominally pure CuAlO2 sample was analysed by electron paramagnetic resonance (EPR) and nuclear magnetic resonance (NMR) spectroscopy to get microscopic insight into composition of the sintered sample, i.e. presence of impurities within the bulk network. 
The semiconducting nature of the sintered sample was confirmed by the apparent increase of both dielectric permittivity and dielectric loss factor with increasing temperature and decrease with increasing frequency. Furthermore, the temperature dependence of the Hall parameters (resistivity-ρ, carrier concentration-ND, mobility-µ) of the CuAlO2 ceramic was analysed. The resistivity of the samples decreased with increasing temperature from 830 Ωcm at 230 K to 11 Ωcm at 350 K, due to the increase in both the number of charge carriers and their mobility. Also, room temperature Hall measurements revealed a positive Hall coefficient 
RH = 33.8 cm-3C-1, which confirmed the p-type conduction of the material. 
Within this contribution the relationship between processing, composition and properties of the CuAlO2 ceramic is discussed.",
journal = "Conference of the European Ceramic Society XIV, Toledo",
title = "Processing-property relationship for solid-state synthesized CuAlO2 ceramic",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2915"
}

Vojisavljević, K., Gartner, M., Jeglič, P., Arčon, D., Deluca, M.,& Malič, B.. (2015). Processing-property relationship for solid-state synthesized CuAlO2 ceramic. in Conference of the European Ceramic Society XIV, Toledo.
https://hdl.handle.net/21.15107/rcub_rimsi_2915

Vojisavljević K, Gartner M, Jeglič P, Arčon D, Deluca M, Malič B. Processing-property relationship for solid-state synthesized CuAlO2 ceramic. in Conference of the European Ceramic Society XIV, Toledo. 2015;.
https://hdl.handle.net/21.15107/rcub_rimsi_2915 .

Vojisavljević, Katarina, Gartner, Mariuca, Jeglič, Peter, Arčon, Denis, Deluca, Marco, Malič, Barbara, "Processing-property relationship for solid-state synthesized CuAlO2 ceramic" in Conference of the European Ceramic Society XIV, Toledo (2015),
https://hdl.handle.net/21.15107/rcub_rimsi_2915 .

TY  - CONF
AU  - Bertoncelj, Barbara
AU  - Vojisavljević, Katarina
AU  - Rihtaršič, Janez
AU  - Huskič, Miroslav
AU  - Žagar, Ema
AU  - Malič, Barbara
PY  - 2015
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/3032
AB  - Versatile applications of glass-fiber reinforced composites are still growing despite the fact that they have been is use for several decades. They exhibit good mechanical performances along with low densities and these are some of the advantages due to which they replaced metals in the past years, especially in transportation and electro industry.
Properties of composites are dependent on the individual phases, i.e. the polymer-matrix, type of reinforcement and mineral filler, and can be tailored by properly selecting the individual constituents and their ratio.
Polymer resin based on unsaturated polyesters, glass fibers and CaCO3 mineral filler is the most commonly employed in Bulk Molding Compounds (BMC), i.e. in a pre-prepared mixture of aforementioned constituents. The most common processing methods for BMCs are compression or injection molding, especially used for the mass production of small, complex-shaped components [1,2].
Since such materials are exposed to thermal stresses during processing as well as during service conditions, it is of great importance to study their thermal stability and thermal behaviour and properties. 
Different samples of BMCs were commercially fabricated with varying E-glass fiber and CaCO3 mineral filler contents, but keeping the content of polymer resin constant. The aim of this study was to investigate the effect of E-glass fiber weight content on physical properties and thermal behaviour of composites by means of the thermal analysis techniques.


[1]	R. Burns, Polyester molding compounds. New York: M. Dekker (1982).
[2]	JF. Monk, Thermosetting Plastics: Moulding materials and Processes. Harlow: Longman (1997).
C3  - 3rd Central and Eastern European Conference on Thermal Analysis and Calorimetry
T1  - Influence of E-glass fiber content on thermal properties of glass-fiber reinforced composites
EP  - 274
SP  - 274
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_3032
ER  - 

@conference{
author = "Bertoncelj, Barbara and Vojisavljević, Katarina and Rihtaršič, Janez and Huskič, Miroslav and Žagar, Ema and Malič, Barbara",
year = "2015",
abstract = "Versatile applications of glass-fiber reinforced composites are still growing despite the fact that they have been is use for several decades. They exhibit good mechanical performances along with low densities and these are some of the advantages due to which they replaced metals in the past years, especially in transportation and electro industry.
Properties of composites are dependent on the individual phases, i.e. the polymer-matrix, type of reinforcement and mineral filler, and can be tailored by properly selecting the individual constituents and their ratio.
Polymer resin based on unsaturated polyesters, glass fibers and CaCO3 mineral filler is the most commonly employed in Bulk Molding Compounds (BMC), i.e. in a pre-prepared mixture of aforementioned constituents. The most common processing methods for BMCs are compression or injection molding, especially used for the mass production of small, complex-shaped components [1,2].
Since such materials are exposed to thermal stresses during processing as well as during service conditions, it is of great importance to study their thermal stability and thermal behaviour and properties. 
Different samples of BMCs were commercially fabricated with varying E-glass fiber and CaCO3 mineral filler contents, but keeping the content of polymer resin constant. The aim of this study was to investigate the effect of E-glass fiber weight content on physical properties and thermal behaviour of composites by means of the thermal analysis techniques.


[1]	R. Burns, Polyester molding compounds. New York: M. Dekker (1982).
[2]	JF. Monk, Thermosetting Plastics: Moulding materials and Processes. Harlow: Longman (1997).",
journal = "3rd Central and Eastern European Conference on Thermal Analysis and Calorimetry",
title = "Influence of E-glass fiber content on thermal properties of glass-fiber reinforced composites",
pages = "274-274",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_3032"
}

Bertoncelj, B., Vojisavljević, K., Rihtaršič, J., Huskič, M., Žagar, E.,& Malič, B.. (2015). Influence of E-glass fiber content on thermal properties of glass-fiber reinforced composites. in 3rd Central and Eastern European Conference on Thermal Analysis and Calorimetry, 274-274.
https://hdl.handle.net/21.15107/rcub_rimsi_3032

Bertoncelj B, Vojisavljević K, Rihtaršič J, Huskič M, Žagar E, Malič B. Influence of E-glass fiber content on thermal properties of glass-fiber reinforced composites. in 3rd Central and Eastern European Conference on Thermal Analysis and Calorimetry. 2015;:274-274.
https://hdl.handle.net/21.15107/rcub_rimsi_3032 .

Bertoncelj, Barbara, Vojisavljević, Katarina, Rihtaršič, Janez, Huskič, Miroslav, Žagar, Ema, Malič, Barbara, "Influence of E-glass fiber content on thermal properties of glass-fiber reinforced composites" in 3rd Central and Eastern European Conference on Thermal Analysis and Calorimetry (2015):274-274,
https://hdl.handle.net/21.15107/rcub_rimsi_3032 .

TY  - CONF
AU  - Čampa, Andrej
AU  - Berginc, Marko
AU  - Vojisavljević, Katarina
AU  - Malič, Barbara
AU  - Panjan, Peter
AU  - Topič, Marko
PY  - 2015
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2893
AB  - In the optoelectronics, especially in thin-film photovoltaics, the transparent conductive oxides (TCO) play an important role to minimize the front contact optical losses. The TCOs used as a front contact needs to have low resistivity (<1 mOhmcm), high optical transparency in the broad wavelength region (>80% at 400-1000 nm) and high temperature stability. In the case of using nano-imprinted lithography for reproduction of the morphologies the good electrical and optical properties should be obtained at low deposition or post-annealed temperatures. To translate the morphology, at which the light is efficiently scattered, to the internal interfaces of the solar cells very low thickness of TCO is required (<200 nm). One of such candidates is Ga doped SnO2:In (ITO), which exhibits better optical and similar electrical properties to ITO 90/10, additionally it has lower indium content. A multicomponent Ga-In-Sn oxide target with Ga:In:Sn = 4:64:32 metal ratio was prepared, that was used in RF sputtering system for deposition of high quality GITO thin-film layers on glass. In this study, we will focus on electrical (specific resistivity, mobility and carrier concentration) and optical properties (thickness and refractive index) as a function of deposition and annealing parameters. The results of optical and electrical characterization of the two best GITOs will be presented, one globally optimized and one optimized with the respect to the low temperature deposition prerequisite.
C3  - 2015 E-MRS Fall Meeting and Exhibit
T1  - Ga doped ITO transparent conductive oxide: Optical and electrical properties at different deposition conditions
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2893
ER  - 

@conference{
author = "Čampa, Andrej and Berginc, Marko and Vojisavljević, Katarina and Malič, Barbara and Panjan, Peter and Topič, Marko",
year = "2015",
abstract = "In the optoelectronics, especially in thin-film photovoltaics, the transparent conductive oxides (TCO) play an important role to minimize the front contact optical losses. The TCOs used as a front contact needs to have low resistivity (<1 mOhmcm), high optical transparency in the broad wavelength region (>80% at 400-1000 nm) and high temperature stability. In the case of using nano-imprinted lithography for reproduction of the morphologies the good electrical and optical properties should be obtained at low deposition or post-annealed temperatures. To translate the morphology, at which the light is efficiently scattered, to the internal interfaces of the solar cells very low thickness of TCO is required (<200 nm). One of such candidates is Ga doped SnO2:In (ITO), which exhibits better optical and similar electrical properties to ITO 90/10, additionally it has lower indium content. A multicomponent Ga-In-Sn oxide target with Ga:In:Sn = 4:64:32 metal ratio was prepared, that was used in RF sputtering system for deposition of high quality GITO thin-film layers on glass. In this study, we will focus on electrical (specific resistivity, mobility and carrier concentration) and optical properties (thickness and refractive index) as a function of deposition and annealing parameters. The results of optical and electrical characterization of the two best GITOs will be presented, one globally optimized and one optimized with the respect to the low temperature deposition prerequisite.",
journal = "2015 E-MRS Fall Meeting and Exhibit",
title = "Ga doped ITO transparent conductive oxide: Optical and electrical properties at different deposition conditions",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2893"
}

Čampa, A., Berginc, M., Vojisavljević, K., Malič, B., Panjan, P.,& Topič, M.. (2015). Ga doped ITO transparent conductive oxide: Optical and electrical properties at different deposition conditions. in 2015 E-MRS Fall Meeting and Exhibit.
https://hdl.handle.net/21.15107/rcub_rimsi_2893

Čampa A, Berginc M, Vojisavljević K, Malič B, Panjan P, Topič M. Ga doped ITO transparent conductive oxide: Optical and electrical properties at different deposition conditions. in 2015 E-MRS Fall Meeting and Exhibit. 2015;.
https://hdl.handle.net/21.15107/rcub_rimsi_2893 .

Čampa, Andrej, Berginc, Marko, Vojisavljević, Katarina, Malič, Barbara, Panjan, Peter, Topič, Marko, "Ga doped ITO transparent conductive oxide: Optical and electrical properties at different deposition conditions" in 2015 E-MRS Fall Meeting and Exhibit (2015),
https://hdl.handle.net/21.15107/rcub_rimsi_2893 .

TY  - CONF
AU  - Vojisavljević, Katarina
AU  - Kurinčič, Nika
AU  - Uršič, Hana
AU  - Malič, Barbara
PY  - 2015
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2897
AB  - Over the past few decades, the potassium sodium niobate, K0.5Na0.5NbO3 (KNN) has drawn a lot of research interests as an environment-friendly lead-free ferroelectric material suitable for production of thin-film electronic devices. 
The poor functional properties of the KNN thin films prepared by chemical solution deposition are frequently addressed to the volatilisation of alkali (K- and Na-) compounds during processing, which hinders control over the stoichiometry, contributes to the formation of secondary phases and deterioration of the microstructure. The problem can be overcome by adding alkalis in excess and/or by partial substitution of the A- and B- site atoms, such as in the case of the solid state synthesized KNN ceramics. Therefore, in this contribution, the influence of the alkaline-earth A- site dopant, Sr2+ on the microstructure, structure, dielectric and ferroelectric properties were examined for the solution-derived KNN thin films with alkaline excess.
Liquid precursors of (K0.5Na0.5)1-ySryNbO3 (KNN-ySr) thin-films, where the Sr- dopant content was set at y = 0, 0.005, 0.01, were prepared from potassium and sodium acetates and niobium ethoxide in 2-methoxyethanol solvent with 5 mol% of potassium acetate excess, and an appropriate amount of strontium acetate dissolved in acetic acid. The approximately 250 nm thick KNN-ySr thin films on Pt/TiOx/SiO2/Si substrates were obtained through repeated spin-coating and pyrolysis steps at 300 oC for 2 min, followed by the rapid thermal annealing at 650 oC in air flow for 5 min with heating and cooling rates of 12 K/s. 
According to X-ray diffraction analysis, all of the synthesized KNN thin films crystallize in pure perovskite phase with a random orientation. The surface and cross-section microstructure analysis, performed by the field emission scanning electron microscopy, reveals that the KNN-ySr films consist of equiaxed grains, the average size of which gradually decreases from about 90 nm to a few tens of nm by increasing the Sr-dopant content. In the contribution we report the influence of the chemical modification on the functional response of the as-prepared films, dielectric properties versus frequency and temperature, polarisation – electric field dependence and leakage current. In addition, the topography and the local current measurements of the KNN-ySr films analysed by atomic force microscopy are discussed.
C3  - Electroceramics XV, June 27-28-29, 2015, Limoges, France
T1  - Microstructure and functional properties of solution-derived Sr-modified potassium sodium niobate thin films
EP  - 164
SP  - 164
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2897
ER  - 

@conference{
author = "Vojisavljević, Katarina and Kurinčič, Nika and Uršič, Hana and Malič, Barbara",
year = "2015",
abstract = "Over the past few decades, the potassium sodium niobate, K0.5Na0.5NbO3 (KNN) has drawn a lot of research interests as an environment-friendly lead-free ferroelectric material suitable for production of thin-film electronic devices. 
The poor functional properties of the KNN thin films prepared by chemical solution deposition are frequently addressed to the volatilisation of alkali (K- and Na-) compounds during processing, which hinders control over the stoichiometry, contributes to the formation of secondary phases and deterioration of the microstructure. The problem can be overcome by adding alkalis in excess and/or by partial substitution of the A- and B- site atoms, such as in the case of the solid state synthesized KNN ceramics. Therefore, in this contribution, the influence of the alkaline-earth A- site dopant, Sr2+ on the microstructure, structure, dielectric and ferroelectric properties were examined for the solution-derived KNN thin films with alkaline excess.
Liquid precursors of (K0.5Na0.5)1-ySryNbO3 (KNN-ySr) thin-films, where the Sr- dopant content was set at y = 0, 0.005, 0.01, were prepared from potassium and sodium acetates and niobium ethoxide in 2-methoxyethanol solvent with 5 mol% of potassium acetate excess, and an appropriate amount of strontium acetate dissolved in acetic acid. The approximately 250 nm thick KNN-ySr thin films on Pt/TiOx/SiO2/Si substrates were obtained through repeated spin-coating and pyrolysis steps at 300 oC for 2 min, followed by the rapid thermal annealing at 650 oC in air flow for 5 min with heating and cooling rates of 12 K/s. 
According to X-ray diffraction analysis, all of the synthesized KNN thin films crystallize in pure perovskite phase with a random orientation. The surface and cross-section microstructure analysis, performed by the field emission scanning electron microscopy, reveals that the KNN-ySr films consist of equiaxed grains, the average size of which gradually decreases from about 90 nm to a few tens of nm by increasing the Sr-dopant content. In the contribution we report the influence of the chemical modification on the functional response of the as-prepared films, dielectric properties versus frequency and temperature, polarisation – electric field dependence and leakage current. In addition, the topography and the local current measurements of the KNN-ySr films analysed by atomic force microscopy are discussed.",
journal = "Electroceramics XV, June 27-28-29, 2015, Limoges, France",
title = "Microstructure and functional properties of solution-derived Sr-modified potassium sodium niobate thin films",
pages = "164-164",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2897"
}

Vojisavljević, K., Kurinčič, N., Uršič, H.,& Malič, B.. (2015). Microstructure and functional properties of solution-derived Sr-modified potassium sodium niobate thin films. in Electroceramics XV, June 27-28-29, 2015, Limoges, France, 164-164.
https://hdl.handle.net/21.15107/rcub_rimsi_2897

Vojisavljević K, Kurinčič N, Uršič H, Malič B. Microstructure and functional properties of solution-derived Sr-modified potassium sodium niobate thin films. in Electroceramics XV, June 27-28-29, 2015, Limoges, France. 2015;:164-164.
https://hdl.handle.net/21.15107/rcub_rimsi_2897 .

Vojisavljević, Katarina, Kurinčič, Nika, Uršič, Hana, Malič, Barbara, "Microstructure and functional properties of solution-derived Sr-modified potassium sodium niobate thin films" in Electroceramics XV, June 27-28-29, 2015, Limoges, France (2015):164-164,
https://hdl.handle.net/21.15107/rcub_rimsi_2897 .

TY  - CONF
AU  - Bertoncelj, Barbara
AU  - Vojisavljević, Katarina
AU  - Rihtaršič, Janez
AU  - Jelenc, Gregor
AU  - Malič, Barbara
PY  - 2015
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2902
AB  - In this study, the influence of E-glass fiber and mineral filler content
on the microstructure, physical, mechanical and dielectric properties of Glass
Fiber Reinforced Composites (GFRC) was investigated. Five sets of GFRC,
based on polymer resin with varying E-grade glass fibers and CaCO3 mineral
filler weight fractions (15/64, 20/59, 25/54, 30/49, 35/44), were commercially
prepared. Test specimens were prepared by compression molding. Scanning
Electron Microscope images revealed that at higher concentrations, the fibers
clustered together, resulting in heterogeneous microstructures. Characterization
of the composites showed that glass fiber content and distribution significantly
affects the mechanical properties. The flexural strength of the composites
decreased with increasing glass fiber content. The dielectric constant ε`
decreased with increasing fiber content.
PB  - Mednarodna podiplomska ²ola Joºefa Stefana, Ljubljana
C3  - 7. ŠTUDENTSKA KONFERENCA MEDNARODNE PODIPLOMSKE ŠOLE JOŽEFA STEFANA
T1  - Microstructure, mechanical and electrical properties of Glass Fiber Reinforced Composites (GFRC)
EP  - 161
IS  - 1
SP  - 152
VL  - 1
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2902
ER  - 

@conference{
author = "Bertoncelj, Barbara and Vojisavljević, Katarina and Rihtaršič, Janez and Jelenc, Gregor and Malič, Barbara",
year = "2015",
abstract = "In this study, the influence of E-glass fiber and mineral filler content
on the microstructure, physical, mechanical and dielectric properties of Glass
Fiber Reinforced Composites (GFRC) was investigated. Five sets of GFRC,
based on polymer resin with varying E-grade glass fibers and CaCO3 mineral
filler weight fractions (15/64, 20/59, 25/54, 30/49, 35/44), were commercially
prepared. Test specimens were prepared by compression molding. Scanning
Electron Microscope images revealed that at higher concentrations, the fibers
clustered together, resulting in heterogeneous microstructures. Characterization
of the composites showed that glass fiber content and distribution significantly
affects the mechanical properties. The flexural strength of the composites
decreased with increasing glass fiber content. The dielectric constant ε`
decreased with increasing fiber content.",
publisher = "Mednarodna podiplomska ²ola Joºefa Stefana, Ljubljana",
journal = "7. ŠTUDENTSKA KONFERENCA MEDNARODNE PODIPLOMSKE ŠOLE JOŽEFA STEFANA",
title = "Microstructure, mechanical and electrical properties of Glass Fiber Reinforced Composites (GFRC)",
pages = "161-152",
number = "1",
volume = "1",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2902"
}

Bertoncelj, B., Vojisavljević, K., Rihtaršič, J., Jelenc, G.,& Malič, B.. (2015). Microstructure, mechanical and electrical properties of Glass Fiber Reinforced Composites (GFRC). in 7. ŠTUDENTSKA KONFERENCA MEDNARODNE PODIPLOMSKE ŠOLE JOŽEFA STEFANA
Mednarodna podiplomska ²ola Joºefa Stefana, Ljubljana., 1(1), 152-161.
https://hdl.handle.net/21.15107/rcub_rimsi_2902

Bertoncelj B, Vojisavljević K, Rihtaršič J, Jelenc G, Malič B. Microstructure, mechanical and electrical properties of Glass Fiber Reinforced Composites (GFRC). in 7. ŠTUDENTSKA KONFERENCA MEDNARODNE PODIPLOMSKE ŠOLE JOŽEFA STEFANA. 2015;1(1):152-161.
https://hdl.handle.net/21.15107/rcub_rimsi_2902 .

Bertoncelj, Barbara, Vojisavljević, Katarina, Rihtaršič, Janez, Jelenc, Gregor, Malič, Barbara, "Microstructure, mechanical and electrical properties of Glass Fiber Reinforced Composites (GFRC)" in 7. ŠTUDENTSKA KONFERENCA MEDNARODNE PODIPLOMSKE ŠOLE JOŽEFA STEFANA, 1, no. 1 (2015):152-161,
https://hdl.handle.net/21.15107/rcub_rimsi_2902 .

TY  - CONF
AU  - Bertoncelj, Barbara
AU  - Vojisavljević, Katarina
AU  - Rihtaršič, Janez
AU  - Jelenc, Gregor
AU  - Malič, Barbara
PY  - 2014
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2896
C3  - 50th International Conference  on Microelectronics, Devices and Materials
T1  - Effect of e-glass fiber and mineral filler content on microstructure, mechanical, dielectric and thermal properties of bulk molding compound
EP  - 232
SP  - 227
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2896
ER  - 

@conference{
author = "Bertoncelj, Barbara and Vojisavljević, Katarina and Rihtaršič, Janez and Jelenc, Gregor and Malič, Barbara",
year = "2014",
journal = "50th International Conference  on Microelectronics, Devices and Materials",
title = "Effect of e-glass fiber and mineral filler content on microstructure, mechanical, dielectric and thermal properties of bulk molding compound",
pages = "232-227",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2896"
}

Bertoncelj, B., Vojisavljević, K., Rihtaršič, J., Jelenc, G.,& Malič, B.. (2014). Effect of e-glass fiber and mineral filler content on microstructure, mechanical, dielectric and thermal properties of bulk molding compound. in 50th International Conference  on Microelectronics, Devices and Materials, 227-232.
https://hdl.handle.net/21.15107/rcub_rimsi_2896

Bertoncelj B, Vojisavljević K, Rihtaršič J, Jelenc G, Malič B. Effect of e-glass fiber and mineral filler content on microstructure, mechanical, dielectric and thermal properties of bulk molding compound. in 50th International Conference  on Microelectronics, Devices and Materials. 2014;:227-232.
https://hdl.handle.net/21.15107/rcub_rimsi_2896 .

Bertoncelj, Barbara, Vojisavljević, Katarina, Rihtaršič, Janez, Jelenc, Gregor, Malič, Barbara, "Effect of e-glass fiber and mineral filler content on microstructure, mechanical, dielectric and thermal properties of bulk molding compound" in 50th International Conference  on Microelectronics, Devices and Materials (2014):227-232,
https://hdl.handle.net/21.15107/rcub_rimsi_2896 .

TY  - CONF
AU  - Vojisavljević, Katarina
AU  - Wicker, Susanne
AU  - Barsan, Nicolae
AU  - Kmet, Brigita
AU  - Drnovšek, Silvo
AU  - Malič, Barbara
PY  - 2014
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2914
AB  - Cobalt oxide, Co3O4, which is known as a good CO catalyst, has in the past decade also drawn some research interest as a p-type metal oxide gas sensor. A powerful strategy to improve the sensor performance is the utilization of a nanocrystalline powder with a high surface to volume ratio. Thus, a strong interaction between the surrounding gas and the sensor material is enabled.
The nanocrystalline Co3O4 powder was synthesised by the nitrate-glycine self-sustained combustion route. The glycine/metal ion ratio was adjusted to provide stoichiometric or fuel-lean conditions of the redox reaction. During the rapid heating, the gels auto-ignited at approximately 250 oC (depending on the amount of the fuel) and spontaneously underwent a smouldering combustion with the evolution of large amounts of gases, subsequently forming a voluminous precursor powder. According to the X-ray diffraction analysis the phase-pure Co3O4 was obtained only when the precursor powder was prepared from the fuel-lean redox reaction. The field emission scanning electron micrographs revealed the spongy aspect of the calcined powder, where small primary particles formed the agglomerates. 
For the screen-printing, the Co3O4 powder was milled to break the agglomerates, and then mixed with the organic binder to achieve a viscous paste suitable for printing. The paste was screen printed onto Al2O3 substrates with interdigitated Pt electrodes for read-out of the resistance and a Pt heater for operation at well controlled temperatures, on the front and back-sides respectively. The about 50 µm thick films were fired at 400 oC in air. The phase composition was analysed by X-ray diffraction analysis and Fourier transformed infrared spectroscopy. The catalytic conversion of the Co3O4 powder and the sensor signal of the corresponding sensors were checked under different concentrations of the CO, CH4 and C2H5OH test gases.
PB  - Edition of Electromeramics Conference
C3  - Electroceramics XIV Conference 2014
T1  - Preparation of nanocrystalline Co3O4 powder and processing of thick films for sensor application
EP  - 17
SP  - 17
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2914
ER  - 

@conference{
author = "Vojisavljević, Katarina and Wicker, Susanne and Barsan, Nicolae and Kmet, Brigita and Drnovšek, Silvo and Malič, Barbara",
year = "2014",
abstract = "Cobalt oxide, Co3O4, which is known as a good CO catalyst, has in the past decade also drawn some research interest as a p-type metal oxide gas sensor. A powerful strategy to improve the sensor performance is the utilization of a nanocrystalline powder with a high surface to volume ratio. Thus, a strong interaction between the surrounding gas and the sensor material is enabled.
The nanocrystalline Co3O4 powder was synthesised by the nitrate-glycine self-sustained combustion route. The glycine/metal ion ratio was adjusted to provide stoichiometric or fuel-lean conditions of the redox reaction. During the rapid heating, the gels auto-ignited at approximately 250 oC (depending on the amount of the fuel) and spontaneously underwent a smouldering combustion with the evolution of large amounts of gases, subsequently forming a voluminous precursor powder. According to the X-ray diffraction analysis the phase-pure Co3O4 was obtained only when the precursor powder was prepared from the fuel-lean redox reaction. The field emission scanning electron micrographs revealed the spongy aspect of the calcined powder, where small primary particles formed the agglomerates. 
For the screen-printing, the Co3O4 powder was milled to break the agglomerates, and then mixed with the organic binder to achieve a viscous paste suitable for printing. The paste was screen printed onto Al2O3 substrates with interdigitated Pt electrodes for read-out of the resistance and a Pt heater for operation at well controlled temperatures, on the front and back-sides respectively. The about 50 µm thick films were fired at 400 oC in air. The phase composition was analysed by X-ray diffraction analysis and Fourier transformed infrared spectroscopy. The catalytic conversion of the Co3O4 powder and the sensor signal of the corresponding sensors were checked under different concentrations of the CO, CH4 and C2H5OH test gases.",
publisher = "Edition of Electromeramics Conference",
journal = "Electroceramics XIV Conference 2014",
title = "Preparation of nanocrystalline Co3O4 powder and processing of thick films for sensor application",
pages = "17-17",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2914"
}

Vojisavljević, K., Wicker, S., Barsan, N., Kmet, B., Drnovšek, S.,& Malič, B.. (2014). Preparation of nanocrystalline Co3O4 powder and processing of thick films for sensor application. in Electroceramics XIV Conference 2014
Edition of Electromeramics Conference., 17-17.
https://hdl.handle.net/21.15107/rcub_rimsi_2914

Vojisavljević K, Wicker S, Barsan N, Kmet B, Drnovšek S, Malič B. Preparation of nanocrystalline Co3O4 powder and processing of thick films for sensor application. in Electroceramics XIV Conference 2014. 2014;:17-17.
https://hdl.handle.net/21.15107/rcub_rimsi_2914 .

Vojisavljević, Katarina, Wicker, Susanne, Barsan, Nicolae, Kmet, Brigita, Drnovšek, Silvo, Malič, Barbara, "Preparation of nanocrystalline Co3O4 powder and processing of thick films for sensor application" in Electroceramics XIV Conference 2014 (2014):17-17,
https://hdl.handle.net/21.15107/rcub_rimsi_2914 .

TY  - CONF
AU  - Vojisavljević, Katarina
AU  - Stojanović, Biljana
AU  - Khomyakova, Evgeniya
AU  - Benčan Golob, Andreja
AU  - Kmet, Brigita
AU  - Malič, Barbara
PY  - 2014
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2920
AB  - The copper aluminate (CuAlO2) with the delafossite structure has recently drawn attention as a promising p-type semiconducting material. It can be used as a transparent conducting oxide in the field of invisible electronics for production of different optoelectronic devices, but also as a catalyst for conversion of the solar power to hydrogen energy, room temperature ozone sensor, or thermoelectric. The performance of CuAlO2 in some of the mentioned applications could be optimized by increasing the surface area and decreasing its particle size. For that purpose, the nanocrystalline CuAlO2 powder was synthesised by the self-sustained combustion route. 
Citric acid was introduced both as the chelating and reducing agent or fuel. The citric acid/metal ion ratio was adjusted to provide fuel-lean, stoichiometric, and fuel-rich conditions of the redox reaction. Equimolar amounts of copper and aluminium nitrates were dissolved in deionized water. Then, the citric acid was added. The solution was agitated at room temperature for 1 h, and then neutralized to increase the efficiency of the chelating agent. After several hours of drying in the temperature range 60 oC – 80 oC, the sol turned to a homogeneous viscous gel. During the rapid heating, the gel auto-ignited at approximately 250 oC and spontaneously underwent smouldering combustion, forming the grey-black voluminous precursor powder. 
According to the X-ray diffraction analysis the phase pure delafossite was obtained only when the precursor powder was prepared from the stoichiometric redox reaction, and after the calcination at 920 oC for 4 h in Ar atmosphere. The field emission scanning electron micrographs revealed the cauliflower aspect of the calcined powder, where small primary particles formed the agglomerates. The formation of the phase pure CuAlO2 powder was also followed by Fourier transformed infrared spectroscopy and confirmed by selective area diffraction analysis.
PB  - Edition of Electromeramics Conference
C3  - Electroceramics XIV Conference 2014
T1  - Nanocrystalline CuAlO2 powder by the nitrate-citrate combustion route
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2920
ER  - 

@conference{
author = "Vojisavljević, Katarina and Stojanović, Biljana and Khomyakova, Evgeniya and Benčan Golob, Andreja and Kmet, Brigita and Malič, Barbara",
year = "2014",
abstract = "The copper aluminate (CuAlO2) with the delafossite structure has recently drawn attention as a promising p-type semiconducting material. It can be used as a transparent conducting oxide in the field of invisible electronics for production of different optoelectronic devices, but also as a catalyst for conversion of the solar power to hydrogen energy, room temperature ozone sensor, or thermoelectric. The performance of CuAlO2 in some of the mentioned applications could be optimized by increasing the surface area and decreasing its particle size. For that purpose, the nanocrystalline CuAlO2 powder was synthesised by the self-sustained combustion route. 
Citric acid was introduced both as the chelating and reducing agent or fuel. The citric acid/metal ion ratio was adjusted to provide fuel-lean, stoichiometric, and fuel-rich conditions of the redox reaction. Equimolar amounts of copper and aluminium nitrates were dissolved in deionized water. Then, the citric acid was added. The solution was agitated at room temperature for 1 h, and then neutralized to increase the efficiency of the chelating agent. After several hours of drying in the temperature range 60 oC – 80 oC, the sol turned to a homogeneous viscous gel. During the rapid heating, the gel auto-ignited at approximately 250 oC and spontaneously underwent smouldering combustion, forming the grey-black voluminous precursor powder. 
According to the X-ray diffraction analysis the phase pure delafossite was obtained only when the precursor powder was prepared from the stoichiometric redox reaction, and after the calcination at 920 oC for 4 h in Ar atmosphere. The field emission scanning electron micrographs revealed the cauliflower aspect of the calcined powder, where small primary particles formed the agglomerates. The formation of the phase pure CuAlO2 powder was also followed by Fourier transformed infrared spectroscopy and confirmed by selective area diffraction analysis.",
publisher = "Edition of Electromeramics Conference",
journal = "Electroceramics XIV Conference 2014",
title = "Nanocrystalline CuAlO2 powder by the nitrate-citrate combustion route",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2920"
}

Vojisavljević, K., Stojanović, B., Khomyakova, E., Benčan Golob, A., Kmet, B.,& Malič, B.. (2014). Nanocrystalline CuAlO2 powder by the nitrate-citrate combustion route. in Electroceramics XIV Conference 2014
Edition of Electromeramics Conference..
https://hdl.handle.net/21.15107/rcub_rimsi_2920

Vojisavljević K, Stojanović B, Khomyakova E, Benčan Golob A, Kmet B, Malič B. Nanocrystalline CuAlO2 powder by the nitrate-citrate combustion route. in Electroceramics XIV Conference 2014. 2014;.
https://hdl.handle.net/21.15107/rcub_rimsi_2920 .

Vojisavljević, Katarina, Stojanović, Biljana, Khomyakova, Evgeniya, Benčan Golob, Andreja, Kmet, Brigita, Malič, Barbara, "Nanocrystalline CuAlO2 powder by the nitrate-citrate combustion route" in Electroceramics XIV Conference 2014 (2014),
https://hdl.handle.net/21.15107/rcub_rimsi_2920 .

TY  - CONF
AU  - Vojisavljević, Katarina
AU  - Wicker, Susanne
AU  - Barsan, Nicolae
AU  - Kmet, Brigita
AU  - Drnovšek, Silvo
AU  - Malič, Barbara
PY  - 2014
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2909
AB  - Cobalt oxide, Co3O4, has shown great potentials for various practical applications due to excellent
electronic, magnetic and redox properties. Its high catalytic activity in combustion of CO is well
known for a longer period. However, this material has also drawn some research interest as a p-type
metal oxide gas sensor. A powerful strategy to improve both catalytic and sensor performance is the
utilization of a nanocrystalline powder with a high surface to volume ratio. Thus, a strong interaction
between the surrounding gas and the material is enabled.
The nanocrystalline Co3O4 powder was synthesised by the nitrate-glycine combustion route. The
glycine/metal ion ratio was adjusted to provide stoichiometric or fuel-lean conditions of the redox
reaction. The auto-ignition of gels with the evolution of large amounts of gases was occurred at
approximately 180 °C, and the process was spontaneously underwent to a smouldering combustion
and formation of a voluminous powder. According to the X-ray diffraction analysis the phase-pure
Co3O4 was obtained only when the precursor powder was prepared from the 50% fuel-lean redox
reaction. The field emission scanning electron micrographs revealed the spongy aspect of the calcined
powder, where small primary particles formed the agglomerates.
For the screen-printing, the Co3O4 powder was mixed with the organic binder to achieve a viscous
paste suitable for printing. The paste was screen printed onto Al2O3 substrates with interdigitated Pt
electrodes for read-out of the resistance and a Pt heater for operation at well controlled temperatures,
and fired at 400 °C in air. The catalytic conversion of the Co3O4 powder and the sensor signal of the
corresponding sensors were checked under different concentrations of the reducing test gases. The
excellent catalytic activity of the Co3O4 powder was confirmed. The sensor signal was the best to
ethanol at the operating temperature of 150 °C, which was found to be 100 °C lower than for comercial
SnO2 sensors.
PB  - In{titut za kovinske materiale in tehnologije, Ljubljana, Lepi pot 11, Ljubljana, Slovenija
C3  - 22nd INTERNATIONAL CONFERENCE ON MATERIALS AND TECHNOLOGY
T1  - CATALYTIC AND SENSOR PROPERTIES OF Co3O4 PREPARED BY COMBUSTION SYNTHESIS ROUTE
EP  - 246
SP  - 246
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2909
ER  - 

@conference{
author = "Vojisavljević, Katarina and Wicker, Susanne and Barsan, Nicolae and Kmet, Brigita and Drnovšek, Silvo and Malič, Barbara",
year = "2014",
abstract = "Cobalt oxide, Co3O4, has shown great potentials for various practical applications due to excellent
electronic, magnetic and redox properties. Its high catalytic activity in combustion of CO is well
known for a longer period. However, this material has also drawn some research interest as a p-type
metal oxide gas sensor. A powerful strategy to improve both catalytic and sensor performance is the
utilization of a nanocrystalline powder with a high surface to volume ratio. Thus, a strong interaction
between the surrounding gas and the material is enabled.
The nanocrystalline Co3O4 powder was synthesised by the nitrate-glycine combustion route. The
glycine/metal ion ratio was adjusted to provide stoichiometric or fuel-lean conditions of the redox
reaction. The auto-ignition of gels with the evolution of large amounts of gases was occurred at
approximately 180 °C, and the process was spontaneously underwent to a smouldering combustion
and formation of a voluminous powder. According to the X-ray diffraction analysis the phase-pure
Co3O4 was obtained only when the precursor powder was prepared from the 50% fuel-lean redox
reaction. The field emission scanning electron micrographs revealed the spongy aspect of the calcined
powder, where small primary particles formed the agglomerates.
For the screen-printing, the Co3O4 powder was mixed with the organic binder to achieve a viscous
paste suitable for printing. The paste was screen printed onto Al2O3 substrates with interdigitated Pt
electrodes for read-out of the resistance and a Pt heater for operation at well controlled temperatures,
and fired at 400 °C in air. The catalytic conversion of the Co3O4 powder and the sensor signal of the
corresponding sensors were checked under different concentrations of the reducing test gases. The
excellent catalytic activity of the Co3O4 powder was confirmed. The sensor signal was the best to
ethanol at the operating temperature of 150 °C, which was found to be 100 °C lower than for comercial
SnO2 sensors.",
publisher = "In{titut za kovinske materiale in tehnologije, Ljubljana, Lepi pot 11, Ljubljana, Slovenija",
journal = "22nd INTERNATIONAL CONFERENCE ON MATERIALS AND TECHNOLOGY",
title = "CATALYTIC AND SENSOR PROPERTIES OF Co3O4 PREPARED BY COMBUSTION SYNTHESIS ROUTE",
pages = "246-246",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2909"
}

Vojisavljević, K., Wicker, S., Barsan, N., Kmet, B., Drnovšek, S.,& Malič, B.. (2014). CATALYTIC AND SENSOR PROPERTIES OF Co3O4 PREPARED BY COMBUSTION SYNTHESIS ROUTE. in 22nd INTERNATIONAL CONFERENCE ON MATERIALS AND TECHNOLOGY
In{titut za kovinske materiale in tehnologije, Ljubljana, Lepi pot 11, Ljubljana, Slovenija., 246-246.
https://hdl.handle.net/21.15107/rcub_rimsi_2909

Vojisavljević K, Wicker S, Barsan N, Kmet B, Drnovšek S, Malič B. CATALYTIC AND SENSOR PROPERTIES OF Co3O4 PREPARED BY COMBUSTION SYNTHESIS ROUTE. in 22nd INTERNATIONAL CONFERENCE ON MATERIALS AND TECHNOLOGY. 2014;:246-246.
https://hdl.handle.net/21.15107/rcub_rimsi_2909 .

Vojisavljević, Katarina, Wicker, Susanne, Barsan, Nicolae, Kmet, Brigita, Drnovšek, Silvo, Malič, Barbara, "CATALYTIC AND SENSOR PROPERTIES OF Co3O4 PREPARED BY COMBUSTION SYNTHESIS ROUTE" in 22nd INTERNATIONAL CONFERENCE ON MATERIALS AND TECHNOLOGY (2014):246-246,
https://hdl.handle.net/21.15107/rcub_rimsi_2909 .

TY  - CONF
AU  - Bertoncelj, Barbara
AU  - Vojisavljević, Katarina
AU  - Rihtaršič, Janez
AU  - Jelenc, Gregor
AU  - Malič, Barbara
AU  - Stušek, Marko
AU  - Belavič, Darko
PY  - 2013
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2911
C3  - 49th International Conference  on Microelectronics, Devices and Materials  with the Workshop on  Digital Electronic Systems
T1  - Characterization of glass fiber reinforced composites for housing of electrical motors
EP  - 106
SP  - 101
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2911
ER  - 

@conference{
author = "Bertoncelj, Barbara and Vojisavljević, Katarina and Rihtaršič, Janez and Jelenc, Gregor and Malič, Barbara and Stušek, Marko and Belavič, Darko",
year = "2013",
journal = "49th International Conference  on Microelectronics, Devices and Materials  with the Workshop on  Digital Electronic Systems",
title = "Characterization of glass fiber reinforced composites for housing of electrical motors",
pages = "106-101",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2911"
}

Bertoncelj, B., Vojisavljević, K., Rihtaršič, J., Jelenc, G., Malič, B., Stušek, M.,& Belavič, D.. (2013). Characterization of glass fiber reinforced composites for housing of electrical motors. in 49th International Conference  on Microelectronics, Devices and Materials  with the Workshop on  Digital Electronic Systems, 101-106.
https://hdl.handle.net/21.15107/rcub_rimsi_2911

Bertoncelj B, Vojisavljević K, Rihtaršič J, Jelenc G, Malič B, Stušek M, Belavič D. Characterization of glass fiber reinforced composites for housing of electrical motors. in 49th International Conference  on Microelectronics, Devices and Materials  with the Workshop on  Digital Electronic Systems. 2013;:101-106.
https://hdl.handle.net/21.15107/rcub_rimsi_2911 .

Bertoncelj, Barbara, Vojisavljević, Katarina, Rihtaršič, Janez, Jelenc, Gregor, Malič, Barbara, Stušek, Marko, Belavič, Darko, "Characterization of glass fiber reinforced composites for housing of electrical motors" in 49th International Conference  on Microelectronics, Devices and Materials  with the Workshop on  Digital Electronic Systems (2013):101-106,
https://hdl.handle.net/21.15107/rcub_rimsi_2911 .

TY  - CONF
AU  - Vojisavljević, Katarina
AU  - Stojanović, Biljana
AU  - Kmet, Brigita
AU  - Cilenšek, Jena
AU  - Malič, Barbara
PY  - 2013
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2917
AB  - Recently, a considerable effort has been devoted to research and improvement of both dielectrics and wide band-gap semiconductors for the realization of fully transparent devices. Due to the lack of available p-type transparent conducting oxide (TCO) materials, special attention was paid to production of delafossite structured CuMO2 (M = Al, Cr or Y), which exhibit sufficiently large energy gap, required for transparency across the full visible spectrum, and high enough concentration of holes with sufficiently large mobility. Those materials are considered to be good candidates for p-type TCOs. Among them, the CuAlO2 seems to be the most promising candidate to fulfill the demands for technical application. 
However, related studies on CuAlO2 are interested not only in examination of the transparent conducting oxides properties, but also in exploring its applications as a catalyst for the conversion of solar power to hydrogen energy, catalysts for steam reforming process and exhaust gas purification, room temperature ozone sensors, or thermoelectric devices. The performance of CuAlO2 in some of the mentioned applications could be optimized by increasing surface area and decreasing its particle size. Therefore, the synthesis of nanocrystalline CuAlO2 has been a hot topic for material chemists.
The nanocrystalline delafossite CuAlO2 powder was synthesised by a sol-gel nitrate-citrate self-sustained combustion route. Citric acid was introduced both as the chelating and reducing agent or fuel. The citric acid/metal ion ratio was adjusted to provide fuel-lean, stoichiometric or fuel-rich conditions of the redox reaction. Equimolar amounts of copper and aluminium nitrates and the citric acid were dissolved in deionized water. The solution was agitated at room temperature for 1 h, and then neutralized to increase the efficiency of chelating agent. After several hours of drying in temperature range 60 oC – 80 oC, the sol was turned to homogeneous viscous gel. During the rapid heating, the gels auto-ignited at approximately 250 oC (depending on the amount of the fuel) and underwent smouldering combustion spontaneously with the evolution of large amounts of gases, subsequently forming the grey-black voluminous precursor powders. 
According to the X-ray diffraction analysis the phase pure delafossite was obtained only when the precursor powder was prepared from the stoichiometric redox reaction, and after the calcination at 920 oC for 4 h in Ar atmosphere. The field emission scanning electron micrographs revealed the cauliflower aspect of the calcined powder, where small primary particles formed the agglomerates. The formation of the phase pure CuAlO2 powder was also confirmed by Fourier transformed infrared spectroscopy. 
Compared with the solid state synthesis where high processing temperatures (1100 oC) and long reaction times (96 h) have been used to obtain single-phase delafossite CuAlO2 [1, 2], both the calcination temperature and the dwell time are certainly lowered by the proposed citrate-nitrate combustion route.

References: 
[1] Liou, Y.C.; Lee, U.R. J. Alloys Comp. 467,:496(2009).
[2] Zheng, X.G.; Taniguchi, K.; Takahashi, A.; Liu, Y.; Xu, C.N. Appl. Phys. Lett. 85, 1728(2004).

Acknowledgments:
We acknowledge the financial support of the Slovenian research agency (research programme P2-0105 and projects J2-4273) and the EC within the 7FP ORAMA project: Oxide materials for electronics applications, Grant Agreement NMP3-LA-2010-246334.
PB  - Ljubljana : Jožef Stefan Institute, 2013
C3  - SLONANO
T1  - Self-sustained combustion synthesis of the p-type nanocrystalline CuAlO2 powder
EP  - 79
SP  - 79
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2917
ER  - 

@conference{
author = "Vojisavljević, Katarina and Stojanović, Biljana and Kmet, Brigita and Cilenšek, Jena and Malič, Barbara",
year = "2013",
abstract = "Recently, a considerable effort has been devoted to research and improvement of both dielectrics and wide band-gap semiconductors for the realization of fully transparent devices. Due to the lack of available p-type transparent conducting oxide (TCO) materials, special attention was paid to production of delafossite structured CuMO2 (M = Al, Cr or Y), which exhibit sufficiently large energy gap, required for transparency across the full visible spectrum, and high enough concentration of holes with sufficiently large mobility. Those materials are considered to be good candidates for p-type TCOs. Among them, the CuAlO2 seems to be the most promising candidate to fulfill the demands for technical application. 
However, related studies on CuAlO2 are interested not only in examination of the transparent conducting oxides properties, but also in exploring its applications as a catalyst for the conversion of solar power to hydrogen energy, catalysts for steam reforming process and exhaust gas purification, room temperature ozone sensors, or thermoelectric devices. The performance of CuAlO2 in some of the mentioned applications could be optimized by increasing surface area and decreasing its particle size. Therefore, the synthesis of nanocrystalline CuAlO2 has been a hot topic for material chemists.
The nanocrystalline delafossite CuAlO2 powder was synthesised by a sol-gel nitrate-citrate self-sustained combustion route. Citric acid was introduced both as the chelating and reducing agent or fuel. The citric acid/metal ion ratio was adjusted to provide fuel-lean, stoichiometric or fuel-rich conditions of the redox reaction. Equimolar amounts of copper and aluminium nitrates and the citric acid were dissolved in deionized water. The solution was agitated at room temperature for 1 h, and then neutralized to increase the efficiency of chelating agent. After several hours of drying in temperature range 60 oC – 80 oC, the sol was turned to homogeneous viscous gel. During the rapid heating, the gels auto-ignited at approximately 250 oC (depending on the amount of the fuel) and underwent smouldering combustion spontaneously with the evolution of large amounts of gases, subsequently forming the grey-black voluminous precursor powders. 
According to the X-ray diffraction analysis the phase pure delafossite was obtained only when the precursor powder was prepared from the stoichiometric redox reaction, and after the calcination at 920 oC for 4 h in Ar atmosphere. The field emission scanning electron micrographs revealed the cauliflower aspect of the calcined powder, where small primary particles formed the agglomerates. The formation of the phase pure CuAlO2 powder was also confirmed by Fourier transformed infrared spectroscopy. 
Compared with the solid state synthesis where high processing temperatures (1100 oC) and long reaction times (96 h) have been used to obtain single-phase delafossite CuAlO2 [1, 2], both the calcination temperature and the dwell time are certainly lowered by the proposed citrate-nitrate combustion route.

References: 
[1] Liou, Y.C.; Lee, U.R. J. Alloys Comp. 467,:496(2009).
[2] Zheng, X.G.; Taniguchi, K.; Takahashi, A.; Liu, Y.; Xu, C.N. Appl. Phys. Lett. 85, 1728(2004).

Acknowledgments:
We acknowledge the financial support of the Slovenian research agency (research programme P2-0105 and projects J2-4273) and the EC within the 7FP ORAMA project: Oxide materials for electronics applications, Grant Agreement NMP3-LA-2010-246334.",
publisher = "Ljubljana : Jožef Stefan Institute, 2013",
journal = "SLONANO",
title = "Self-sustained combustion synthesis of the p-type nanocrystalline CuAlO2 powder",
pages = "79-79",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2917"
}

Vojisavljević, K., Stojanović, B., Kmet, B., Cilenšek, J.,& Malič, B.. (2013). Self-sustained combustion synthesis of the p-type nanocrystalline CuAlO2 powder. in SLONANO
Ljubljana : Jožef Stefan Institute, 2013., 79-79.
https://hdl.handle.net/21.15107/rcub_rimsi_2917

Vojisavljević K, Stojanović B, Kmet B, Cilenšek J, Malič B. Self-sustained combustion synthesis of the p-type nanocrystalline CuAlO2 powder. in SLONANO. 2013;:79-79.
https://hdl.handle.net/21.15107/rcub_rimsi_2917 .

Vojisavljević, Katarina, Stojanović, Biljana, Kmet, Brigita, Cilenšek, Jena, Malič, Barbara, "Self-sustained combustion synthesis of the p-type nanocrystalline CuAlO2 powder" in SLONANO (2013):79-79,
https://hdl.handle.net/21.15107/rcub_rimsi_2917 .

TY  - CONF
AU  - Vojisavljević, Katarina
AU  - Stojanović, Biljana
AU  - Kmet, Brigita
AU  - Cilenšek, Jena
AU  - Malič, Barbara
PY  - 2013
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2901
AB  - The nanocrystalline delafossite CuAlO2 powder was synthesised by a sol-gel nitrate-citrate self-combustion route. Citric acid was introduced both as the chelating and reducing agent or fuel. The citric acid/metal ion ratio was adjusted to provide fuel-lean, stoichiometric or fuel-rich conditions of the redox reaction. Equimolar amounts of copper and aluminium nitrates and the citric acid were dissolved in deionized water. The sol was dried at 80 oC to obtain the gel. By increasing the temperature above 250 oC, the gel immediately ignited, forming the precursor powder. According to the X-ray diffraction analysis the phase pure delafossite was obtained only when the precursor powder was prepared from the stoichiometric redox reaction, and after the calcination for 4 h in Ar atmosphere at 920 oC. The field emission scanning electron micrographs revealed the cauliflower aspect of the calcined powder, where small primary particles formed the agglomerates. The formation of the phase pure CuAlO2 powder was also confirmed by Fourier transformed infrared spectroscopy.
PB  - Maribor : Fakulteta za kemijo in kemijsko tehnologijo
C3  - Slovenski kemijski dnevi 2013
T1  - Chemical synthesis of nanocrystalline CuAlO2 via nitrate-citrate combustion route
IS  - 7
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2901
ER  - 

@conference{
author = "Vojisavljević, Katarina and Stojanović, Biljana and Kmet, Brigita and Cilenšek, Jena and Malič, Barbara",
year = "2013",
abstract = "The nanocrystalline delafossite CuAlO2 powder was synthesised by a sol-gel nitrate-citrate self-combustion route. Citric acid was introduced both as the chelating and reducing agent or fuel. The citric acid/metal ion ratio was adjusted to provide fuel-lean, stoichiometric or fuel-rich conditions of the redox reaction. Equimolar amounts of copper and aluminium nitrates and the citric acid were dissolved in deionized water. The sol was dried at 80 oC to obtain the gel. By increasing the temperature above 250 oC, the gel immediately ignited, forming the precursor powder. According to the X-ray diffraction analysis the phase pure delafossite was obtained only when the precursor powder was prepared from the stoichiometric redox reaction, and after the calcination for 4 h in Ar atmosphere at 920 oC. The field emission scanning electron micrographs revealed the cauliflower aspect of the calcined powder, where small primary particles formed the agglomerates. The formation of the phase pure CuAlO2 powder was also confirmed by Fourier transformed infrared spectroscopy.",
publisher = "Maribor : Fakulteta za kemijo in kemijsko tehnologijo",
journal = "Slovenski kemijski dnevi 2013",
title = "Chemical synthesis of nanocrystalline CuAlO2 via nitrate-citrate combustion route",
number = "7",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2901"
}

Vojisavljević, K., Stojanović, B., Kmet, B., Cilenšek, J.,& Malič, B.. (2013). Chemical synthesis of nanocrystalline CuAlO2 via nitrate-citrate combustion route. in Slovenski kemijski dnevi 2013
Maribor : Fakulteta za kemijo in kemijsko tehnologijo.(7).
https://hdl.handle.net/21.15107/rcub_rimsi_2901

Vojisavljević K, Stojanović B, Kmet B, Cilenšek J, Malič B. Chemical synthesis of nanocrystalline CuAlO2 via nitrate-citrate combustion route. in Slovenski kemijski dnevi 2013. 2013;(7).
https://hdl.handle.net/21.15107/rcub_rimsi_2901 .

Vojisavljević, Katarina, Stojanović, Biljana, Kmet, Brigita, Cilenšek, Jena, Malič, Barbara, "Chemical synthesis of nanocrystalline CuAlO2 via nitrate-citrate combustion route" in Slovenski kemijski dnevi 2013, no. 7 (2013),
https://hdl.handle.net/21.15107/rcub_rimsi_2901 .

TY  - CONF
AU  - Vojisavljević, Katarina
AU  - Malič, Barbara
AU  - Mamoru, Senna
AU  - Kuscer, Danjela
AU  - Drnovšek, Silvo
AU  - Kosec, Marija
PY  - 2012
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2918
AB  - In the past two decades, a considerable effort has been devoted to the study and development of different n- and p-type oxide semiconductors for transparent electronics applications. The p-type delafossite materials CuMO2 (M = Al, Cr or Y) with the band gap above 3 eV, which allows high transparency across the entire visible region, are of particular interest. Copper aluminate (CuAlO2) films prepared by physical vapour deposition have been reported to exhibit the p-type behaviour and have already been used in various applications in optoelectronics. Phase-pure targets with a high relative density are prerequisites for physical vapour deposition of high quality CuAlO2 films. However, secondary phases and low relative densities have been reported for the solid-state synthesized delafossite CuAlO2 although high processing temperatures and extremely long times have been used [1, 2].
The aim of this work has been to prepare the phase pure delafossite powders and dense ceramics by solid-state synthesis. Instead of the usually reported α-alumina (α-Al2O3), we introduced the nano-sized boehmite µ-AlOOH.xH2O powder as an aluminium source, for two reasons, i.e., for its high specific surface area and a consequent large number of contacts with Cu2O particles and for higher reactivity as a consequence of the thermal decomposition (Hedvall effect) as compared to the oxide. Furthermore, the role of different atmospheres, namely inert (Ar) and oxidising (air), has been explored. 
The solid-state reaction between nano-Al2O3 and Cu2O (up to ≈ 1 µm in size) at 1100oC in argon resulted in the delafossite phase with appreciable quantities of both unreacted oxides even after 24 h of heating. In contrast, phase pure delafossite powder was synthesized upon heating the nano-boehmite and Cu2O powder mixture for 2 x 10 h at 1100oC in inert Ar atmosphere as confirmed by XRD. The powder consisted of loose agglomerates of plate-like particles of a few 100 nm in size. Heating in air resulted in formation of the spinel CuAl2O4 and CuO phases beside the delafossite in both cases. 
The ceramic with 86% of theoretical density has been obtained after sintering the boehmite-derived CuAlO2 powder compact at 1100oC for 2h in air. According to XRD the ceramic was single-phase delafossite. However SEM /EDXS analysis revealed traces of Cu-rich impurities at the surface of the pellet. The bulk of the sample revealed a dense microstructure with a uniform distribution of porosity within the delafossite matrix.

References
[1] H. G. Zheng, K. Taniguchi, A. Takahashi, Y. Liu, C. N. Xu, Appl. Phys. Lett., 85, 1728 (2004).
[2] Y. -C. Liou, U. -R. Lee, J. Alloys Comp., 467, 496 (2009).

Acknowledgement
We acknowledge for funding the 7.FP ORAMA (NMP2-LA-2010-246334: Oxide materials for electronics applications).
C3  - 4th Symposium on Transparent Conductive Materials, 21-26 October 2012, Crete, Greece
T1  - Processing of delafossite CuAlO2 ceramic targets by solid state synthesis route
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2918
ER  - 

@conference{
author = "Vojisavljević, Katarina and Malič, Barbara and Mamoru, Senna and Kuscer, Danjela and Drnovšek, Silvo and Kosec, Marija",
year = "2012",
abstract = "In the past two decades, a considerable effort has been devoted to the study and development of different n- and p-type oxide semiconductors for transparent electronics applications. The p-type delafossite materials CuMO2 (M = Al, Cr or Y) with the band gap above 3 eV, which allows high transparency across the entire visible region, are of particular interest. Copper aluminate (CuAlO2) films prepared by physical vapour deposition have been reported to exhibit the p-type behaviour and have already been used in various applications in optoelectronics. Phase-pure targets with a high relative density are prerequisites for physical vapour deposition of high quality CuAlO2 films. However, secondary phases and low relative densities have been reported for the solid-state synthesized delafossite CuAlO2 although high processing temperatures and extremely long times have been used [1, 2].
The aim of this work has been to prepare the phase pure delafossite powders and dense ceramics by solid-state synthesis. Instead of the usually reported α-alumina (α-Al2O3), we introduced the nano-sized boehmite µ-AlOOH.xH2O powder as an aluminium source, for two reasons, i.e., for its high specific surface area and a consequent large number of contacts with Cu2O particles and for higher reactivity as a consequence of the thermal decomposition (Hedvall effect) as compared to the oxide. Furthermore, the role of different atmospheres, namely inert (Ar) and oxidising (air), has been explored. 
The solid-state reaction between nano-Al2O3 and Cu2O (up to ≈ 1 µm in size) at 1100oC in argon resulted in the delafossite phase with appreciable quantities of both unreacted oxides even after 24 h of heating. In contrast, phase pure delafossite powder was synthesized upon heating the nano-boehmite and Cu2O powder mixture for 2 x 10 h at 1100oC in inert Ar atmosphere as confirmed by XRD. The powder consisted of loose agglomerates of plate-like particles of a few 100 nm in size. Heating in air resulted in formation of the spinel CuAl2O4 and CuO phases beside the delafossite in both cases. 
The ceramic with 86% of theoretical density has been obtained after sintering the boehmite-derived CuAlO2 powder compact at 1100oC for 2h in air. According to XRD the ceramic was single-phase delafossite. However SEM /EDXS analysis revealed traces of Cu-rich impurities at the surface of the pellet. The bulk of the sample revealed a dense microstructure with a uniform distribution of porosity within the delafossite matrix.

References
[1] H. G. Zheng, K. Taniguchi, A. Takahashi, Y. Liu, C. N. Xu, Appl. Phys. Lett., 85, 1728 (2004).
[2] Y. -C. Liou, U. -R. Lee, J. Alloys Comp., 467, 496 (2009).

Acknowledgement
We acknowledge for funding the 7.FP ORAMA (NMP2-LA-2010-246334: Oxide materials for electronics applications).",
journal = "4th Symposium on Transparent Conductive Materials, 21-26 October 2012, Crete, Greece",
title = "Processing of delafossite CuAlO2 ceramic targets by solid state synthesis route",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2918"
}

Vojisavljević, K., Malič, B., Mamoru, S., Kuscer, D., Drnovšek, S.,& Kosec, M.. (2012). Processing of delafossite CuAlO2 ceramic targets by solid state synthesis route. in 4th Symposium on Transparent Conductive Materials, 21-26 October 2012, Crete, Greece.
https://hdl.handle.net/21.15107/rcub_rimsi_2918

Vojisavljević K, Malič B, Mamoru S, Kuscer D, Drnovšek S, Kosec M. Processing of delafossite CuAlO2 ceramic targets by solid state synthesis route. in 4th Symposium on Transparent Conductive Materials, 21-26 October 2012, Crete, Greece. 2012;.
https://hdl.handle.net/21.15107/rcub_rimsi_2918 .

Vojisavljević, Katarina, Malič, Barbara, Mamoru, Senna, Kuscer, Danjela, Drnovšek, Silvo, Kosec, Marija, "Processing of delafossite CuAlO2 ceramic targets by solid state synthesis route" in 4th Symposium on Transparent Conductive Materials, 21-26 October 2012, Crete, Greece (2012),
https://hdl.handle.net/21.15107/rcub_rimsi_2918 .

TY  - CONF
AU  - Vojisavljević, Katarina
AU  - Malič, Barbara
AU  - Mamoru, Senna
AU  - Drnovšek, Silvo
AU  - Kosec, Marija
PY  - 2012
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2910
AB  - Within this work, the focus was on preparation of the delafossite CuAlO2 single phase powder and ceramic with a high density by the solid state synthesis, and on dielectric properties of the as-synthesized ceramic. The reaction between the nanoboehmite γ-AlOOH, with a high specific surface area, and the Cu2O, with the particles below 1 μm, was enhanced by comminution in a high energy mill, which resulted in reduction of the particle size and consequently shorter diffusion paths between constituent powders. The phase pure CuAlO2 powder was synthesized upon heating the reagent powder mixture two times for 10 h at 1100oC in the inert argon atmosphere as confirmed by the X-ray analysis. The ceramic with 86% of theoretical density was obtained after sintering the CuAlO2 powder compact at 1100oC for 2 h in air. According to the X-ray analysis the ceramic sample was single-phase. The bulk of the sample revealed a dense microstructure with a uniform distribution of porosity within the delafossite matrix. However, traces of Cu-rich impurities have been identified at the surface of the pellets by the EDXS analysis. The semiconducting nature of the ceramic sample was confirmed by the temperature dependent dielectric parameters measurements (ε’ and tgδ) in the 10 kHZ-1MHz frequency range between 297 and 473 K.
C3  - 48th International Conference  on Microelectronics, Devices and Materials  with the Workshop on  Ceramic Microsystems
T1  - Preparation and dielectric properties of CuAlO2 ceramics
EP  - 156
SP  - 151
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2910
ER  - 

@conference{
author = "Vojisavljević, Katarina and Malič, Barbara and Mamoru, Senna and Drnovšek, Silvo and Kosec, Marija",
year = "2012",
abstract = "Within this work, the focus was on preparation of the delafossite CuAlO2 single phase powder and ceramic with a high density by the solid state synthesis, and on dielectric properties of the as-synthesized ceramic. The reaction between the nanoboehmite γ-AlOOH, with a high specific surface area, and the Cu2O, with the particles below 1 μm, was enhanced by comminution in a high energy mill, which resulted in reduction of the particle size and consequently shorter diffusion paths between constituent powders. The phase pure CuAlO2 powder was synthesized upon heating the reagent powder mixture two times for 10 h at 1100oC in the inert argon atmosphere as confirmed by the X-ray analysis. The ceramic with 86% of theoretical density was obtained after sintering the CuAlO2 powder compact at 1100oC for 2 h in air. According to the X-ray analysis the ceramic sample was single-phase. The bulk of the sample revealed a dense microstructure with a uniform distribution of porosity within the delafossite matrix. However, traces of Cu-rich impurities have been identified at the surface of the pellets by the EDXS analysis. The semiconducting nature of the ceramic sample was confirmed by the temperature dependent dielectric parameters measurements (ε’ and tgδ) in the 10 kHZ-1MHz frequency range between 297 and 473 K.",
journal = "48th International Conference  on Microelectronics, Devices and Materials  with the Workshop on  Ceramic Microsystems",
title = "Preparation and dielectric properties of CuAlO2 ceramics",
pages = "156-151",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2910"
}

Vojisavljević, K., Malič, B., Mamoru, S., Drnovšek, S.,& Kosec, M.. (2012). Preparation and dielectric properties of CuAlO2 ceramics. in 48th International Conference  on Microelectronics, Devices and Materials  with the Workshop on  Ceramic Microsystems, 151-156.
https://hdl.handle.net/21.15107/rcub_rimsi_2910

Vojisavljević K, Malič B, Mamoru S, Drnovšek S, Kosec M. Preparation and dielectric properties of CuAlO2 ceramics. in 48th International Conference  on Microelectronics, Devices and Materials  with the Workshop on  Ceramic Microsystems. 2012;:151-156.
https://hdl.handle.net/21.15107/rcub_rimsi_2910 .

Vojisavljević, Katarina, Malič, Barbara, Mamoru, Senna, Drnovšek, Silvo, Kosec, Marija, "Preparation and dielectric properties of CuAlO2 ceramics" in 48th International Conference  on Microelectronics, Devices and Materials  with the Workshop on  Ceramic Microsystems (2012):151-156,
https://hdl.handle.net/21.15107/rcub_rimsi_2910 .

TY  - JOUR
AU  - Vijatović Petrović, Mirjana
AU  - Bobić, Jelena
AU  - Stojanović, Biljana D
AU  - Malič, Barbara
PY  - 2010
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2193
AB  - The barium titanate (BaTiO3) thick films were prepared by screen printing technique using powders obtained
by soft chemical route, modified Pechini process. Three different barium titanate powders were prepared: i)
pure, ii) doped with lanthanum and iii) doped with antimony. Pastes for screen printing were prepared using
previously obtained powders. The thick films were deposited onto Al2O3 substrates and fired at 850°C together
with electrode material (silver/palladium) in the moving belt furnace in the air atmosphere. Measurements of
thickness and roughness of barium titanate thick films were performed. The electrical properties of thick films
such as dielectric constant, dielectric losses, Curie temperature, hysteresis loop were reported. The influence
of different factors on electrical properties values was analyzed.
PB  - Faculty of Technology, University of Novi Sad
T2  - Processing and Application of Ceramics
T1  - Barium titanate thick films prepared by screen printing technique
EP  - 58
IS  - 2
SP  - 53
VL  - 4
DO  - 10.2298/PAC1002053V
ER  - 

@article{
author = "Vijatović Petrović, Mirjana and Bobić, Jelena and Stojanović, Biljana D and Malič, Barbara",
year = "2010",
abstract = "The barium titanate (BaTiO3) thick films were prepared by screen printing technique using powders obtained
by soft chemical route, modified Pechini process. Three different barium titanate powders were prepared: i)
pure, ii) doped with lanthanum and iii) doped with antimony. Pastes for screen printing were prepared using
previously obtained powders. The thick films were deposited onto Al2O3 substrates and fired at 850°C together
with electrode material (silver/palladium) in the moving belt furnace in the air atmosphere. Measurements of
thickness and roughness of barium titanate thick films were performed. The electrical properties of thick films
such as dielectric constant, dielectric losses, Curie temperature, hysteresis loop were reported. The influence
of different factors on electrical properties values was analyzed.",
publisher = "Faculty of Technology, University of Novi Sad",
journal = "Processing and Application of Ceramics",
title = "Barium titanate thick films prepared by screen printing technique",
pages = "58-53",
number = "2",
volume = "4",
doi = "10.2298/PAC1002053V"
}

Vijatović Petrović, M., Bobić, J., Stojanović, B. D.,& Malič, B.. (2010). Barium titanate thick films prepared by screen printing technique. in Processing and Application of Ceramics
Faculty of Technology, University of Novi Sad., 4(2), 53-58.
https://doi.org/10.2298/PAC1002053V

Vijatović Petrović M, Bobić J, Stojanović BD, Malič B. Barium titanate thick films prepared by screen printing technique. in Processing and Application of Ceramics. 2010;4(2):53-58.
doi:10.2298/PAC1002053V .

Vijatović Petrović, Mirjana, Bobić, Jelena, Stojanović, Biljana D, Malič, Barbara, "Barium titanate thick films prepared by screen printing technique" in Processing and Application of Ceramics, 4, no. 2 (2010):53-58,
https://doi.org/10.2298/PAC1002053V . .

TY  - CONF
AU  - Vijatović Petrović, Mirjana
AU  - Bobić, Jelena
AU  - Stojanović, Biljana
AU  - Malič, Barbara
PY  - 2009
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2721
AB  - Pure and doped with lanthanum and antimony barium titanate (BaTiO3-BT, BTL and BTS) powders were prepared by the polymeric organometallic precursors method (Pechini process-PPM) starting from citrate solutions.

For the preparation of thick films was used screen printing technique. The paste was prepared from suspension of organic material (resin, organic solvent and additives to improve rheological behavior of paste) and barium titanate powders obtained by Pechini procedure, using a ratio 30:70. To get better adhesion between paste and substrate it was added a low temperature melting glass in powder form. The electrodes were prepared from the silver/palladium mixture (Ag/Pd – 70/30). The bottom electrode was deposited on the Al2O3 support and in the middle was screen-printed dielectric layer of (1) pure barium titanate, (2) barium titanate doped with 0.3 mol% La or (3) barium titanate doped with 0.3 mol% Sb. On the top was deposed the upper electrode. The layer-sandwich was sintered at 850oC during 1h in air flow atmosphere.

Measurements of thickness and roughness of barium titanate thick films (BT, BTL and BTS) were performed as well as electrical measurements such as dielectric constant and dielectric losses vs. temperature. The value of dielectric constant was very low and the possible reason could be that the electrode material could diffuse from the surface of BT layer through intergranular pores and affect on changing the dielectric properties of films. This measurement also can point out that dopants may have the influence on dielectric constant. Dopants in this case are decreasing dielectric constant value. Measurement of hysteresis was also performed.
PB  - Faculty of Technology, University of Novi Sad Bul. cara Lazara 1, 21000 Novi Sad, Serbia
C3  - VIII students meeting, processing and Application of Ceramics, December 2-5, 2009, Novi Sad, Serbia, Programme and book of abstracts, p 56
T1  - Barium titanate thick films prepared by screen printing technique
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2721
ER  - 

@conference{
author = "Vijatović Petrović, Mirjana and Bobić, Jelena and Stojanović, Biljana and Malič, Barbara",
year = "2009",
abstract = "Pure and doped with lanthanum and antimony barium titanate (BaTiO3-BT, BTL and BTS) powders were prepared by the polymeric organometallic precursors method (Pechini process-PPM) starting from citrate solutions.

For the preparation of thick films was used screen printing technique. The paste was prepared from suspension of organic material (resin, organic solvent and additives to improve rheological behavior of paste) and barium titanate powders obtained by Pechini procedure, using a ratio 30:70. To get better adhesion between paste and substrate it was added a low temperature melting glass in powder form. The electrodes were prepared from the silver/palladium mixture (Ag/Pd – 70/30). The bottom electrode was deposited on the Al2O3 support and in the middle was screen-printed dielectric layer of (1) pure barium titanate, (2) barium titanate doped with 0.3 mol% La or (3) barium titanate doped with 0.3 mol% Sb. On the top was deposed the upper electrode. The layer-sandwich was sintered at 850oC during 1h in air flow atmosphere.

Measurements of thickness and roughness of barium titanate thick films (BT, BTL and BTS) were performed as well as electrical measurements such as dielectric constant and dielectric losses vs. temperature. The value of dielectric constant was very low and the possible reason could be that the electrode material could diffuse from the surface of BT layer through intergranular pores and affect on changing the dielectric properties of films. This measurement also can point out that dopants may have the influence on dielectric constant. Dopants in this case are decreasing dielectric constant value. Measurement of hysteresis was also performed.",
publisher = "Faculty of Technology, University of Novi Sad Bul. cara Lazara 1, 21000 Novi Sad, Serbia",
journal = "VIII students meeting, processing and Application of Ceramics, December 2-5, 2009, Novi Sad, Serbia, Programme and book of abstracts, p 56",
title = "Barium titanate thick films prepared by screen printing technique",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2721"
}

Vijatović Petrović, M., Bobić, J., Stojanović, B.,& Malič, B.. (2009). Barium titanate thick films prepared by screen printing technique. in VIII students meeting, processing and Application of Ceramics, December 2-5, 2009, Novi Sad, Serbia, Programme and book of abstracts, p 56
Faculty of Technology, University of Novi Sad Bul. cara Lazara 1, 21000 Novi Sad, Serbia..
https://hdl.handle.net/21.15107/rcub_rimsi_2721

Vijatović Petrović M, Bobić J, Stojanović B, Malič B. Barium titanate thick films prepared by screen printing technique. in VIII students meeting, processing and Application of Ceramics, December 2-5, 2009, Novi Sad, Serbia, Programme and book of abstracts, p 56. 2009;.
https://hdl.handle.net/21.15107/rcub_rimsi_2721 .

Vijatović Petrović, Mirjana, Bobić, Jelena, Stojanović, Biljana, Malič, Barbara, "Barium titanate thick films prepared by screen printing technique" in VIII students meeting, processing and Application of Ceramics, December 2-5, 2009, Novi Sad, Serbia, Programme and book of abstracts, p 56 (2009),
https://hdl.handle.net/21.15107/rcub_rimsi_2721 .