TY  - JOUR
AU  - Nikolić, Maria Vesna
AU  - Sekulic, Dalibor L
AU  - Nikolić, Nenad
AU  - Slankamenac, Milos P
AU  - Aleksić, Obrad
AU  - Danninger, H
AU  - Halwax, E
AU  - Pavlović, Vladimir B
AU  - Nikolić, Pantelija M.
PY  - 2013
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/657
AB  - In this work we have analyzed the effects of Ti doping on structural and electrical properties of alpha-Fe2O3. When the amount of added Ti (5 wt.% TiO2) was within the solubility degree and XRD, SEM and EDS analysis revealed a homogenous hematite structure, with lattice parameters a= 5.03719(3), c= 13.7484(1) slightly increased due to incorporation of Ti into the rhombohedral hematite lattice. Higher amounts of Ti (10 wt.% TiO2) resulted in the formation of pseudobrookite, besides hematite, confirmed by SEM and EDS analysis. Studies of electric properties in the temperature range 25-225oC at different frequencies (100-1Mz) showed that Ti doping improved electrical conductivity. Impedance analysis was performed using an equivalent circuit, showing one relaxation process and suggesting dominant grain boundary contribution.
PB  - Međunarodni Institut za nauku o sinterovanju, Beograd
T2  - Science of Sintering
T1  - Structural and Electrical Properties of Ti Doped alpha-Fe2O3
EP  - 292
IS  - 3
SP  - 281
VL  - 45
DO  - 10.2298/SOS1303281N
ER  - 

@article{
author = "Nikolić, Maria Vesna and Sekulic, Dalibor L and Nikolić, Nenad and Slankamenac, Milos P and Aleksić, Obrad and Danninger, H and Halwax, E and Pavlović, Vladimir B and Nikolić, Pantelija M.",
year = "2013",
abstract = "In this work we have analyzed the effects of Ti doping on structural and electrical properties of alpha-Fe2O3. When the amount of added Ti (5 wt.% TiO2) was within the solubility degree and XRD, SEM and EDS analysis revealed a homogenous hematite structure, with lattice parameters a= 5.03719(3), c= 13.7484(1) slightly increased due to incorporation of Ti into the rhombohedral hematite lattice. Higher amounts of Ti (10 wt.% TiO2) resulted in the formation of pseudobrookite, besides hematite, confirmed by SEM and EDS analysis. Studies of electric properties in the temperature range 25-225oC at different frequencies (100-1Mz) showed that Ti doping improved electrical conductivity. Impedance analysis was performed using an equivalent circuit, showing one relaxation process and suggesting dominant grain boundary contribution.",
publisher = "Međunarodni Institut za nauku o sinterovanju, Beograd",
journal = "Science of Sintering",
title = "Structural and Electrical Properties of Ti Doped alpha-Fe2O3",
pages = "292-281",
number = "3",
volume = "45",
doi = "10.2298/SOS1303281N"
}

Nikolić, M. V., Sekulic, D. L., Nikolić, N., Slankamenac, M. P., Aleksić, O., Danninger, H., Halwax, E., Pavlović, V. B.,& Nikolić, P. M.. (2013). Structural and Electrical Properties of Ti Doped alpha-Fe2O3. in Science of Sintering
Međunarodni Institut za nauku o sinterovanju, Beograd., 45(3), 281-292.
https://doi.org/10.2298/SOS1303281N

Nikolić MV, Sekulic DL, Nikolić N, Slankamenac MP, Aleksić O, Danninger H, Halwax E, Pavlović VB, Nikolić PM. Structural and Electrical Properties of Ti Doped alpha-Fe2O3. in Science of Sintering. 2013;45(3):281-292.
doi:10.2298/SOS1303281N .

Nikolić, Maria Vesna, Sekulic, Dalibor L, Nikolić, Nenad, Slankamenac, Milos P, Aleksić, Obrad, Danninger, H, Halwax, E, Pavlović, Vladimir B, Nikolić, Pantelija M., "Structural and Electrical Properties of Ti Doped alpha-Fe2O3" in Science of Sintering, 45, no. 3 (2013):281-292,
https://doi.org/10.2298/SOS1303281N . .

TY  - JOUR
AU  - Nikolić, Maria Vesna
AU  - Slankamenac, Milos P
AU  - Nikolić, Nenad
AU  - Sekulic, Dalibor L
AU  - Aleksić, Obrad
AU  - Mitrić, Miodrag
AU  - Ivetić, Tamara B.
AU  - Pavlović, Vladimir B
AU  - Nikolić, Pantelija M.
PY  - 2012
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/557
AB  - The effects of Zn-doping on the dielectric behavior and electrical properties of bulk alpha-Fe2O3 have been studied. X-ray diffraction analysis revealed the presence of two phases in all samples: hematite and spinel ZnFe2O4, with the amount of spinel phase increasing with increasing Zn content. Scanning electron microscopy analysis combined with energy dispersive X-ray spectroscopy showed that the Zn-bearing phase occurred in the form of individual spinel ZnFe2O4 grains in a hematite matrix. DC conductivity was measured in the temperature range 25-225 degrees C (298-498 K). Impedance spectroscopy measurements in the same temperature range were carried out in the frequency range 100Hz to 10 MHz. Increase in the Zn content resulted in increased electrical conductivity and higher values of the dielectric constant. The resistance and capacitance of grains and grain boundaries were analyzed by modeling the experimental results using an equivalent circuit.
PB  - Međunarodni Institut za nauku o sinterovanju, Beograd
T2  - Science of Sintering
T1  - Study of Dielectric Behavior and Electrical Properties of Hematite alpha-Fe2O3 Doped with Zn
EP  - 321
IS  - 3
SP  - 307
VL  - 44
DO  - 10.2298/SOS1203307N
ER  - 

@article{
author = "Nikolić, Maria Vesna and Slankamenac, Milos P and Nikolić, Nenad and Sekulic, Dalibor L and Aleksić, Obrad and Mitrić, Miodrag and Ivetić, Tamara B. and Pavlović, Vladimir B and Nikolić, Pantelija M.",
year = "2012",
abstract = "The effects of Zn-doping on the dielectric behavior and electrical properties of bulk alpha-Fe2O3 have been studied. X-ray diffraction analysis revealed the presence of two phases in all samples: hematite and spinel ZnFe2O4, with the amount of spinel phase increasing with increasing Zn content. Scanning electron microscopy analysis combined with energy dispersive X-ray spectroscopy showed that the Zn-bearing phase occurred in the form of individual spinel ZnFe2O4 grains in a hematite matrix. DC conductivity was measured in the temperature range 25-225 degrees C (298-498 K). Impedance spectroscopy measurements in the same temperature range were carried out in the frequency range 100Hz to 10 MHz. Increase in the Zn content resulted in increased electrical conductivity and higher values of the dielectric constant. The resistance and capacitance of grains and grain boundaries were analyzed by modeling the experimental results using an equivalent circuit.",
publisher = "Međunarodni Institut za nauku o sinterovanju, Beograd",
journal = "Science of Sintering",
title = "Study of Dielectric Behavior and Electrical Properties of Hematite alpha-Fe2O3 Doped with Zn",
pages = "321-307",
number = "3",
volume = "44",
doi = "10.2298/SOS1203307N"
}

Nikolić, M. V., Slankamenac, M. P., Nikolić, N., Sekulic, D. L., Aleksić, O., Mitrić, M., Ivetić, T. B., Pavlović, V. B.,& Nikolić, P. M.. (2012). Study of Dielectric Behavior and Electrical Properties of Hematite alpha-Fe2O3 Doped with Zn. in Science of Sintering
Međunarodni Institut za nauku o sinterovanju, Beograd., 44(3), 307-321.
https://doi.org/10.2298/SOS1203307N

Nikolić MV, Slankamenac MP, Nikolić N, Sekulic DL, Aleksić O, Mitrić M, Ivetić TB, Pavlović VB, Nikolić PM. Study of Dielectric Behavior and Electrical Properties of Hematite alpha-Fe2O3 Doped with Zn. in Science of Sintering. 2012;44(3):307-321.
doi:10.2298/SOS1203307N .

Nikolić, Maria Vesna, Slankamenac, Milos P, Nikolić, Nenad, Sekulic, Dalibor L, Aleksić, Obrad, Mitrić, Miodrag, Ivetić, Tamara B., Pavlović, Vladimir B, Nikolić, Pantelija M., "Study of Dielectric Behavior and Electrical Properties of Hematite alpha-Fe2O3 Doped with Zn" in Science of Sintering, 44, no. 3 (2012):307-321,
https://doi.org/10.2298/SOS1203307N . .

TY  - JOUR
AU  - Slankamenac, Milos P
AU  - Ivetić, Tamara B.
AU  - Nikolić, Maria Vesna
AU  - Ivetic, N
AU  - Živanov, Milos B
AU  - Pavlović, Vladimir B
PY  - 2010
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/392
AB  - Impedance/admittance and dielectric spectroscopy were used to investigate the effect of temperature on the electrical response of liquid-phase sintered Zn2SnO4-SnO2 ceramics. The measurements were performed over a wide frequency range (100 Hz to 10 MHz) at different temperatures. The real and the imaginary part of the complex impedance traced semicircles in the complex plane. The resistance and the capacitance of bulk and grain-boundary regions were determined by modeling the experimental results using several equivalent circuits taking into account bulk deep trap states. Admittance complex diagrams were also determined in order to understand better the conduction mechanisms occurring in the polycrystalline Zn2SnO4-SnO2 system.
PB  - Springer, New York
T2  - Journal of Electronic Materials
T1  - Impedance Response and Dielectric Relaxation in Liquid-Phase Sintered Zn2SnO4-SnO2 Ceramics
EP  - 455
IS  - 4
SP  - 447
VL  - 39
DO  - 10.1007/s11664-010-1118-3
ER  - 

@article{
author = "Slankamenac, Milos P and Ivetić, Tamara B. and Nikolić, Maria Vesna and Ivetic, N and Živanov, Milos B and Pavlović, Vladimir B",
year = "2010",
abstract = "Impedance/admittance and dielectric spectroscopy were used to investigate the effect of temperature on the electrical response of liquid-phase sintered Zn2SnO4-SnO2 ceramics. The measurements were performed over a wide frequency range (100 Hz to 10 MHz) at different temperatures. The real and the imaginary part of the complex impedance traced semicircles in the complex plane. The resistance and the capacitance of bulk and grain-boundary regions were determined by modeling the experimental results using several equivalent circuits taking into account bulk deep trap states. Admittance complex diagrams were also determined in order to understand better the conduction mechanisms occurring in the polycrystalline Zn2SnO4-SnO2 system.",
publisher = "Springer, New York",
journal = "Journal of Electronic Materials",
title = "Impedance Response and Dielectric Relaxation in Liquid-Phase Sintered Zn2SnO4-SnO2 Ceramics",
pages = "455-447",
number = "4",
volume = "39",
doi = "10.1007/s11664-010-1118-3"
}

Slankamenac, M. P., Ivetić, T. B., Nikolić, M. V., Ivetic, N., Živanov, M. B.,& Pavlović, V. B.. (2010). Impedance Response and Dielectric Relaxation in Liquid-Phase Sintered Zn2SnO4-SnO2 Ceramics. in Journal of Electronic Materials
Springer, New York., 39(4), 447-455.
https://doi.org/10.1007/s11664-010-1118-3

Slankamenac MP, Ivetić TB, Nikolić MV, Ivetic N, Živanov MB, Pavlović VB. Impedance Response and Dielectric Relaxation in Liquid-Phase Sintered Zn2SnO4-SnO2 Ceramics. in Journal of Electronic Materials. 2010;39(4):447-455.
doi:10.1007/s11664-010-1118-3 .

Slankamenac, Milos P, Ivetić, Tamara B., Nikolić, Maria Vesna, Ivetic, N, Živanov, Milos B, Pavlović, Vladimir B, "Impedance Response and Dielectric Relaxation in Liquid-Phase Sintered Zn2SnO4-SnO2 Ceramics" in Journal of Electronic Materials, 39, no. 4 (2010):447-455,
https://doi.org/10.1007/s11664-010-1118-3 . .

TY  - JOUR
AU  - Savić, Slavica M.
AU  - Nikolić, Maria Vesna
AU  - Aleksić, Obrad
AU  - Slankamenac, Milos P
AU  - Živanov, M.
AU  - Nikolić, Pantelija M.
PY  - 2008
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/260
AB  - In this work the DC resistivity of sintered nickel manganite NiMn2O4 (NTC thermistor material) was studied as a function of additional powder activation time in a planetary ball mill (0, 5, 15, 30, 45 and 60 min). The activated powders and non-activated powder were sintered at different temperatures (900, 1050 and 1200 degrees C) for an hour. Structural changes were analyzed using XRD. Sample density, porosity and DC resistivity were measured on the same sintered samples. Correlations between sample density, porosity, and intrinsic DC resistivity vs. additional powder activation time and the sintering temperature were made. It was noticed that the resistivity falls with the increase of sample density (or increase of the sintering temperature).
PB  - Međunarodni Institut za nauku o sinterovanju, Beograd
T2  - Science of Sintering
T1  - Intrinsic resistivity of sintered nickel manganite vs. powder activation time and density
EP  - 32
IS  - 1
SP  - 27
VL  - 40
DO  - 10.2298/SOS0801027S
ER  - 

@article{
author = "Savić, Slavica M. and Nikolić, Maria Vesna and Aleksić, Obrad and Slankamenac, Milos P and Živanov, M. and Nikolić, Pantelija M.",
year = "2008",
abstract = "In this work the DC resistivity of sintered nickel manganite NiMn2O4 (NTC thermistor material) was studied as a function of additional powder activation time in a planetary ball mill (0, 5, 15, 30, 45 and 60 min). The activated powders and non-activated powder were sintered at different temperatures (900, 1050 and 1200 degrees C) for an hour. Structural changes were analyzed using XRD. Sample density, porosity and DC resistivity were measured on the same sintered samples. Correlations between sample density, porosity, and intrinsic DC resistivity vs. additional powder activation time and the sintering temperature were made. It was noticed that the resistivity falls with the increase of sample density (or increase of the sintering temperature).",
publisher = "Međunarodni Institut za nauku o sinterovanju, Beograd",
journal = "Science of Sintering",
title = "Intrinsic resistivity of sintered nickel manganite vs. powder activation time and density",
pages = "32-27",
number = "1",
volume = "40",
doi = "10.2298/SOS0801027S"
}

Savić, S. M., Nikolić, M. V., Aleksić, O., Slankamenac, M. P., Živanov, M.,& Nikolić, P. M.. (2008). Intrinsic resistivity of sintered nickel manganite vs. powder activation time and density. in Science of Sintering
Međunarodni Institut za nauku o sinterovanju, Beograd., 40(1), 27-32.
https://doi.org/10.2298/SOS0801027S

Savić SM, Nikolić MV, Aleksić O, Slankamenac MP, Živanov M, Nikolić PM. Intrinsic resistivity of sintered nickel manganite vs. powder activation time and density. in Science of Sintering. 2008;40(1):27-32.
doi:10.2298/SOS0801027S .

Savić, Slavica M., Nikolić, Maria Vesna, Aleksić, Obrad, Slankamenac, Milos P, Živanov, M., Nikolić, Pantelija M., "Intrinsic resistivity of sintered nickel manganite vs. powder activation time and density" in Science of Sintering, 40, no. 1 (2008):27-32,
https://doi.org/10.2298/SOS0801027S . .

TY  - JOUR
AU  - Ivetić, Tamara B.
AU  - Nikolić, Maria Vesna
AU  - Slankamenac, Milos P
AU  - Živanov, M.
AU  - Minic, Dragica
AU  - Nikolić, Pantelija M.
AU  - Ristic, M. M.
PY  - 2007
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/183
AB  - The effects of small amounts (0.5; 1.0 and 1.5 mol. %) of bismuth oxide on the microstructure and electrical properties of ZnO-SnO2 ceramics have been studied. Starting powders of ZnO and SnO2 were mixed in the molar ratio 2:1. After adding Bi2O3 this mixture was mechanically activated for 10 minutes in a planetary ball mill, uniaxially pressed and sintered at 1300 degrees C for 2h. The phase composition of the sintered samples was analyzed by X-Ray Diffraction (ARD) and by Energy Dispersive Spectrometer (EDS). Morphologies were examined by Scanning Electron Microscopy (SEM). An ImpedancelGain Phase Analyzer (HP 4194A) was used to measure the impedance spectra (100Hz - 10MHz) at different temperatures. The electrical DC resistivity/conductivity at different temperatures was measured using a High Resistance Meter (HP 4329A).
PB  - Međunarodni Institut za nauku o sinterovanju, Beograd
T2  - Science of Sintering
T1  - Influence of Bi2O3 on microstructure and electrical properties of ZnO-SnO2 ceramics
EP  - 240
IS  - 3
SP  - 229
VL  - 39
DO  - 10.2298/SOS0703229I
ER  - 

@article{
author = "Ivetić, Tamara B. and Nikolić, Maria Vesna and Slankamenac, Milos P and Živanov, M. and Minic, Dragica and Nikolić, Pantelija M. and Ristic, M. M.",
year = "2007",
abstract = "The effects of small amounts (0.5; 1.0 and 1.5 mol. %) of bismuth oxide on the microstructure and electrical properties of ZnO-SnO2 ceramics have been studied. Starting powders of ZnO and SnO2 were mixed in the molar ratio 2:1. After adding Bi2O3 this mixture was mechanically activated for 10 minutes in a planetary ball mill, uniaxially pressed and sintered at 1300 degrees C for 2h. The phase composition of the sintered samples was analyzed by X-Ray Diffraction (ARD) and by Energy Dispersive Spectrometer (EDS). Morphologies were examined by Scanning Electron Microscopy (SEM). An ImpedancelGain Phase Analyzer (HP 4194A) was used to measure the impedance spectra (100Hz - 10MHz) at different temperatures. The electrical DC resistivity/conductivity at different temperatures was measured using a High Resistance Meter (HP 4329A).",
publisher = "Međunarodni Institut za nauku o sinterovanju, Beograd",
journal = "Science of Sintering",
title = "Influence of Bi2O3 on microstructure and electrical properties of ZnO-SnO2 ceramics",
pages = "240-229",
number = "3",
volume = "39",
doi = "10.2298/SOS0703229I"
}

Ivetić, T. B., Nikolić, M. V., Slankamenac, M. P., Živanov, M., Minic, D., Nikolić, P. M.,& Ristic, M. M.. (2007). Influence of Bi2O3 on microstructure and electrical properties of ZnO-SnO2 ceramics. in Science of Sintering
Međunarodni Institut za nauku o sinterovanju, Beograd., 39(3), 229-240.
https://doi.org/10.2298/SOS0703229I

Ivetić TB, Nikolić MV, Slankamenac MP, Živanov M, Minic D, Nikolić PM, Ristic MM. Influence of Bi2O3 on microstructure and electrical properties of ZnO-SnO2 ceramics. in Science of Sintering. 2007;39(3):229-240.
doi:10.2298/SOS0703229I .

Ivetić, Tamara B., Nikolić, Maria Vesna, Slankamenac, Milos P, Živanov, M., Minic, Dragica, Nikolić, Pantelija M., Ristic, M. M., "Influence of Bi2O3 on microstructure and electrical properties of ZnO-SnO2 ceramics" in Science of Sintering, 39, no. 3 (2007):229-240,
https://doi.org/10.2298/SOS0703229I . .