TY  - JOUR
AU  - Aleksić, Obrad S.
AU  - Nikolić, M. V.
AU  - Luković, Miloljub D.
AU  - Nikolic, N.
AU  - Radojčić, Marija
AU  - Radovanovic, M.
AU  - Đurić, Zorica
AU  - Mitrić, Miodrag
AU  - Nikolic, P. M.
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4366
AB  - A simple ball milling/thermal treatment procedure was applied to obtain fine thermistor powders. Three different powder compositions were analyzed-Cu0.2Ni0.5Zn1.0Mn1.3O4, Cu0.25Ni0.5Zn1.0Mn1.25O4 and Cu0.4Ni0.5Mn2.1O4. XRD analysis showed that all three powder compositions had a cubic spinel structure. Correlation between the sintering temperature, structure and resulting electrical properties was analyzed on bulk samples. Thick film pastes were composed and segmented thick film thermistors were screen printed on alumina, dried and fired. SEM analysis revealed a typical dendrite structure with small grains and a developed surface area. Thick film sheet resistance was measured on a test matrix and the resistance decreased with increasing Cu content. The temperature dependence of sample resistance was measured in a climatic chamber enabling calculation of the material constant and activation energy. Aging of the obtained segmented thermistors was analyzed and the resistivity drift was 0.23% for the Cu0.2Ni0.5Zn1.0Mn1.3O4 NTC thick film thermistor confirming greater stability of thermistors containing Zn and Cu that in combination with the determined good thermistor characteristics make them good candidates for temperature and heat loss sensor applications. (C) 2012 Elsevier B.V. All rights reserved.
T2  - Materials Science and Engineering. B: Advanced Functional Solid-State Materials
T1  - Preparation and characterization of Cu and Zn modified nickel manganite NTC powders and thick film thermistors
VL  - 178
IS  - 3
SP  - 202
EP  - 210
DO  - 10.1016/j.mseb.2012.11.003
ER  - 

@article{
author = "Aleksić, Obrad S. and Nikolić, M. V. and Luković, Miloljub D. and Nikolic, N. and Radojčić, Marija and Radovanovic, M. and Đurić, Zorica and Mitrić, Miodrag and Nikolic, P. M.",
year = "2013",
abstract = "A simple ball milling/thermal treatment procedure was applied to obtain fine thermistor powders. Three different powder compositions were analyzed-Cu0.2Ni0.5Zn1.0Mn1.3O4, Cu0.25Ni0.5Zn1.0Mn1.25O4 and Cu0.4Ni0.5Mn2.1O4. XRD analysis showed that all three powder compositions had a cubic spinel structure. Correlation between the sintering temperature, structure and resulting electrical properties was analyzed on bulk samples. Thick film pastes were composed and segmented thick film thermistors were screen printed on alumina, dried and fired. SEM analysis revealed a typical dendrite structure with small grains and a developed surface area. Thick film sheet resistance was measured on a test matrix and the resistance decreased with increasing Cu content. The temperature dependence of sample resistance was measured in a climatic chamber enabling calculation of the material constant and activation energy. Aging of the obtained segmented thermistors was analyzed and the resistivity drift was 0.23% for the Cu0.2Ni0.5Zn1.0Mn1.3O4 NTC thick film thermistor confirming greater stability of thermistors containing Zn and Cu that in combination with the determined good thermistor characteristics make them good candidates for temperature and heat loss sensor applications. (C) 2012 Elsevier B.V. All rights reserved.",
journal = "Materials Science and Engineering. B: Advanced Functional Solid-State Materials",
title = "Preparation and characterization of Cu and Zn modified nickel manganite NTC powders and thick film thermistors",
volume = "178",
number = "3",
pages = "202-210",
doi = "10.1016/j.mseb.2012.11.003"
}

Aleksić, O. S., Nikolić, M. V., Luković, M. D., Nikolic, N., Radojčić, M., Radovanovic, M., Đurić, Z., Mitrić, M.,& Nikolic, P. M.. (2013). Preparation and characterization of Cu and Zn modified nickel manganite NTC powders and thick film thermistors. in Materials Science and Engineering. B: Advanced Functional Solid-State Materials, 178(3), 202-210.
https://doi.org/10.1016/j.mseb.2012.11.003

Aleksić OS, Nikolić MV, Luković MD, Nikolic N, Radojčić M, Radovanovic M, Đurić Z, Mitrić M, Nikolic PM. Preparation and characterization of Cu and Zn modified nickel manganite NTC powders and thick film thermistors. in Materials Science and Engineering. B: Advanced Functional Solid-State Materials. 2013;178(3):202-210.
doi:10.1016/j.mseb.2012.11.003 .

Aleksić, Obrad S., Nikolić, M. V., Luković, Miloljub D., Nikolic, N., Radojčić, Marija, Radovanovic, M., Đurić, Zorica, Mitrić, Miodrag, Nikolic, P. M., "Preparation and characterization of Cu and Zn modified nickel manganite NTC powders and thick film thermistors" in Materials Science and Engineering. B: Advanced Functional Solid-State Materials, 178, no. 3 (2013):202-210,
https://doi.org/10.1016/j.mseb.2012.11.003 . .

TY  - JOUR
AU  - Obradović, Nina
AU  - Nikolić, M. V.
AU  - Nikolic, N.
AU  - Filipović, Suzana
AU  - Mitrić, Miodrag
AU  - Pavlović, Vladimir B.
AU  - Nikolic, P. M.
AU  - Đorđević,  Antonije R.
AU  - Ristic, M. M.
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5467
AB  - Mixtures of BaCO3, ZnO and TiO2 powders, with molar ratio of 1:2:4, were mechanically activated for 20, 40 and minutes in a planetary ball mill. The resulting powders were compacted into pellets and isothermally sintered at 1250 degrees C for 2h with a heating rate of 10 degrees C/min. X-ray diffraction analysis of obtained powders and sintered samples was performed in order to investigate changes of the phase composition. The microstructure of sintered samples was examined by scanning electron microscopy. The photoacoustic phase and amplitude spectra of sintered samples were measured as a function of the laser beam modulating frequency using a transmission detection configuration. Fitting of experimental data enabled determination of photoacoustic properties including thermal diffusivity. Based on the results obtained correlation between thermal diffusivity and experimental conditions, as well the samples microstructure characteristics, was discussed.
T2  - Science of Sintering
T1  - Synthesis of Barium-zinc-titanate Ceramics
VL  - 44
IS  - 1
SP  - 65
EP  - 71
DO  - 10.2298/SOS1201065O
ER  - 

@article{
author = "Obradović, Nina and Nikolić, M. V. and Nikolic, N. and Filipović, Suzana and Mitrić, Miodrag and Pavlović, Vladimir B. and Nikolic, P. M. and Đorđević,  Antonije R. and Ristic, M. M.",
year = "2012",
abstract = "Mixtures of BaCO3, ZnO and TiO2 powders, with molar ratio of 1:2:4, were mechanically activated for 20, 40 and minutes in a planetary ball mill. The resulting powders were compacted into pellets and isothermally sintered at 1250 degrees C for 2h with a heating rate of 10 degrees C/min. X-ray diffraction analysis of obtained powders and sintered samples was performed in order to investigate changes of the phase composition. The microstructure of sintered samples was examined by scanning electron microscopy. The photoacoustic phase and amplitude spectra of sintered samples were measured as a function of the laser beam modulating frequency using a transmission detection configuration. Fitting of experimental data enabled determination of photoacoustic properties including thermal diffusivity. Based on the results obtained correlation between thermal diffusivity and experimental conditions, as well the samples microstructure characteristics, was discussed.",
journal = "Science of Sintering",
title = "Synthesis of Barium-zinc-titanate Ceramics",
volume = "44",
number = "1",
pages = "65-71",
doi = "10.2298/SOS1201065O"
}

Obradović, N., Nikolić, M. V., Nikolic, N., Filipović, S., Mitrić, M., Pavlović, V. B., Nikolic, P. M., Đorđević, A. R.,& Ristic, M. M.. (2012). Synthesis of Barium-zinc-titanate Ceramics. in Science of Sintering, 44(1), 65-71.
https://doi.org/10.2298/SOS1201065O

Obradović N, Nikolić MV, Nikolic N, Filipović S, Mitrić M, Pavlović VB, Nikolic PM, Đorđević AR, Ristic MM. Synthesis of Barium-zinc-titanate Ceramics. in Science of Sintering. 2012;44(1):65-71.
doi:10.2298/SOS1201065O .

Obradović, Nina, Nikolić, M. V., Nikolic, N., Filipović, Suzana, Mitrić, Miodrag, Pavlović, Vladimir B., Nikolic, P. M., Đorđević,  Antonije R., Ristic, M. M., "Synthesis of Barium-zinc-titanate Ceramics" in Science of Sintering, 44, no. 1 (2012):65-71,
https://doi.org/10.2298/SOS1201065O . .

TY  - JOUR
AU  - Nikolić, M. V.
AU  - Slankamenac, Miloš P.
AU  - Nikolic, N.
AU  - Sekulić, Dalibor L.
AU  - Aleksić, Obrad S.
AU  - Mitrić, Miodrag
AU  - Ivetić, Tamara B.
AU  - Pavlović, Vladimir B.
AU  - Nikolic, P. M.
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5469
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.
T2  - Science of Sintering
T1  - Study of Dielectric Behavior and Electrical Properties of Hematite alpha-Fe2O3 Doped with Zn
VL  - 44
IS  - 3
SP  - 307
EP  - 321
DO  - 10.2298/SOS1203307N
ER  - 

@article{
author = "Nikolić, M. V. and Slankamenac, Miloš P. and Nikolic, N. and Sekulić, Dalibor L. and Aleksić, Obrad S. and Mitrić, Miodrag and Ivetić, Tamara B. and Pavlović, Vladimir B. and Nikolic, P. 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.",
journal = "Science of Sintering",
title = "Study of Dielectric Behavior and Electrical Properties of Hematite alpha-Fe2O3 Doped with Zn",
volume = "44",
number = "3",
pages = "307-321",
doi = "10.2298/SOS1203307N"
}

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

Nikolić MV, Slankamenac MP, Nikolic N, Sekulić DL, Aleksić OS, Mitrić M, Ivetić TB, Pavlović VB, Nikolic 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, M. V., Slankamenac, Miloš P., Nikolic, N., Sekulić, Dalibor L., Aleksić, Obrad S., Mitrić, Miodrag, Ivetić, Tamara B., Pavlović, Vladimir B., Nikolic, P. 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  - Obradović, Nina
AU  - Stevanović, Stojan
AU  - Mitrić, Miodrag
AU  - Nikolić, M. V.
AU  - Ristic, M. M.
PY  - 2007
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3381
AB  - The aim of this work was analysis of isothermal sintering of zinc titanate ceramics doped with MgO obtained by mechanical activation. Mixtures of ZnO, TiO2 and MgO (0, 1.25 and 2.5%) were mechanically activated 15 minutes in a planetary ball mill. The powders obtained were pressed under different pressures and the results were fitted with a phenomenological compacting equation. Isothermal sintering was performed in air for 120 minutes at four different temperatures. Structural characterization of ZhO-TiO2-MgO system after milling was performed at room temperature using XRPD measurements. DTA measurements showed different activation energies for pure and doped ZnO-TiO2 systems. Thus addition of MgO stabilizes the crystal structure of zinc titanate.
T2  - Science of Sintering
T1  - Analysis of isothermal sintering of zinc-titanate doped with MgO
VL  - 39
IS  - 3
SP  - 241
EP  - 248
DO  - 10.2298/SOS0703241O
ER  - 

@article{
author = "Obradović, Nina and Stevanović, Stojan and Mitrić, Miodrag and Nikolić, M. V. and Ristic, M. M.",
year = "2007",
abstract = "The aim of this work was analysis of isothermal sintering of zinc titanate ceramics doped with MgO obtained by mechanical activation. Mixtures of ZnO, TiO2 and MgO (0, 1.25 and 2.5%) were mechanically activated 15 minutes in a planetary ball mill. The powders obtained were pressed under different pressures and the results were fitted with a phenomenological compacting equation. Isothermal sintering was performed in air for 120 minutes at four different temperatures. Structural characterization of ZhO-TiO2-MgO system after milling was performed at room temperature using XRPD measurements. DTA measurements showed different activation energies for pure and doped ZnO-TiO2 systems. Thus addition of MgO stabilizes the crystal structure of zinc titanate.",
journal = "Science of Sintering",
title = "Analysis of isothermal sintering of zinc-titanate doped with MgO",
volume = "39",
number = "3",
pages = "241-248",
doi = "10.2298/SOS0703241O"
}

Obradović, N., Stevanović, S., Mitrić, M., Nikolić, M. V.,& Ristic, M. M.. (2007). Analysis of isothermal sintering of zinc-titanate doped with MgO. in Science of Sintering, 39(3), 241-248.
https://doi.org/10.2298/SOS0703241O

Obradović N, Stevanović S, Mitrić M, Nikolić MV, Ristic MM. Analysis of isothermal sintering of zinc-titanate doped with MgO. in Science of Sintering. 2007;39(3):241-248.
doi:10.2298/SOS0703241O .

Obradović, Nina, Stevanović, Stojan, Mitrić, Miodrag, Nikolić, M. V., Ristic, M. M., "Analysis of isothermal sintering of zinc-titanate doped with MgO" in Science of Sintering, 39, no. 3 (2007):241-248,
https://doi.org/10.2298/SOS0703241O . .