TY  - CONF
AU  - Nikolić, Maria Vesna
AU  - Slankamenac, Miloš
AU  - Nikolić, N.
AU  - Sekulić, D. I.
AU  - Aleksić, Obrad S.
AU  - Mitrić, Miodrag
AU  - Ivetić, Tamara
AU  - Pavlović, Vladimir B.
AU  - Nikolić, Pantelija M.
PY  - 2012
UR  - http://dais.sanu.ac.rs/123456789/523
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/5685
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°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  - Belgrade : Serbian Ceramic Society
C3  - The First Serbian Ceramic Society Conference "Advanced Ceramics and Application" May 10-11, 2012: Program and the Book of Abstracts
T1  - Study of Dielectric Behavior and Electrical Properties of Hematite a-Fe2O3 Doped with Zn
EP  - 8
SP  - 8
UR  - https://hdl.handle.net/21.15107/rcub_dais_523
ER  - 

@conference{
author = "Nikolić, Maria Vesna and Slankamenac, Miloš and Nikolić, N. and Sekulić, D. I. and Aleksić, Obrad S. and Mitrić, Miodrag and Ivetić, Tamara 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°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 = "Belgrade : Serbian Ceramic Society",
journal = "The First Serbian Ceramic Society Conference "Advanced Ceramics and Application" May 10-11, 2012: Program and the Book of Abstracts",
title = "Study of Dielectric Behavior and Electrical Properties of Hematite a-Fe2O3 Doped with Zn",
pages = "8-8",
url = "https://hdl.handle.net/21.15107/rcub_dais_523"
}

Nikolić, M. V., Slankamenac, M., Nikolić, N., Sekulić, D. I., Aleksić, O. S., Mitrić, M., Ivetić, T., Pavlović, V. B.,& Nikolić, P. M.. (2012). Study of Dielectric Behavior and Electrical Properties of Hematite a-Fe2O3 Doped with Zn. in The First Serbian Ceramic Society Conference "Advanced Ceramics and Application" May 10-11, 2012: Program and the Book of Abstracts
Belgrade : Serbian Ceramic Society., 8-8.
https://hdl.handle.net/21.15107/rcub_dais_523

Nikolić MV, Slankamenac M, Nikolić N, Sekulić DI, Aleksić OS, Mitrić M, Ivetić T, Pavlović VB, Nikolić PM. Study of Dielectric Behavior and Electrical Properties of Hematite a-Fe2O3 Doped with Zn. in The First Serbian Ceramic Society Conference "Advanced Ceramics and Application" May 10-11, 2012: Program and the Book of Abstracts. 2012;:8-8.
https://hdl.handle.net/21.15107/rcub_dais_523 .

Nikolić, Maria Vesna, Slankamenac, Miloš, Nikolić, N., Sekulić, D. I., Aleksić, Obrad S., Mitrić, Miodrag, Ivetić, Tamara, Pavlović, Vladimir B., Nikolić, Pantelija M., "Study of Dielectric Behavior and Electrical Properties of Hematite a-Fe2O3 Doped with Zn" in The First Serbian Ceramic Society Conference "Advanced Ceramics and Application" May 10-11, 2012: Program and the Book of Abstracts (2012):8-8,
https://hdl.handle.net/21.15107/rcub_dais_523 .

TY  - CONF
AU  - Ivetić, Tamara
AU  - Nikolić, Maria Vesna
AU  - Nikolić, Pantelija M.
AU  - Pavlović, Vladimir B.
AU  - Nikolić, Nataša
AU  - Aleksić, Obrad S.
PY  - 2010
UR  - http://dais.sanu.ac.rs/123456789/186
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/5663
AB  - Poster presented at the 4th Serbian Congress for Microscopy, Belgrade, Serbia, 2010, October 11-12, 2010
T1  - Microstructure development and electrical properties of NiO doped alpha-Fe2O3
UR  - https://hdl.handle.net/21.15107/rcub_dais_186
ER  - 

@conference{
author = "Ivetić, Tamara and Nikolić, Maria Vesna and Nikolić, Pantelija M. and Pavlović, Vladimir B. and Nikolić, Nataša and Aleksić, Obrad S.",
year = "2010",
abstract = "Poster presented at the 4th Serbian Congress for Microscopy, Belgrade, Serbia, 2010, October 11-12, 2010",
title = "Microstructure development and electrical properties of NiO doped alpha-Fe2O3",
url = "https://hdl.handle.net/21.15107/rcub_dais_186"
}

Ivetić, T., Nikolić, M. V., Nikolić, P. M., Pavlović, V. B., Nikolić, N.,& Aleksić, O. S.. (2010). Microstructure development and electrical properties of NiO doped alpha-Fe2O3. .
https://hdl.handle.net/21.15107/rcub_dais_186

Ivetić T, Nikolić MV, Nikolić PM, Pavlović VB, Nikolić N, Aleksić OS. Microstructure development and electrical properties of NiO doped alpha-Fe2O3. 2010;.
https://hdl.handle.net/21.15107/rcub_dais_186 .

Ivetić, Tamara, Nikolić, Maria Vesna, Nikolić, Pantelija M., Pavlović, Vladimir B., Nikolić, Nataša, Aleksić, Obrad S., "Microstructure development and electrical properties of NiO doped alpha-Fe2O3" (2010),
https://hdl.handle.net/21.15107/rcub_dais_186 .

TY  - CONF
AU  - Ivetić, Tamara B.
AU  - Nikolić, Maria Vesna P.
AU  - Pavlović, Vladimir
AU  - Nikolić, Pantelija M.
AU  - Ristić, Momčilo M.
PY  - 2007
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/1586
AB  - In this paper the changes that occured in differently activated ZnO-SnO(2) and sintered samples were investigated using photoacoustic spectroscopy. ZnO and SnO(2) powders, mixed in the molar ratio 2:1, were mechanically activated in a planetary ball mill for 10-160 min. The mixtures were pressed and isothermally sintered at 1300 degrees C for two hours. X-ray diffraction analysis of the obtained sintered samples was performed in order to investigate changes of the phase composition and confirmed only the presence of a pure zinc stannate (Zn(2)SnO(4)) phase in all the sintered samples as a result of the solid state reaction and reaction sintering between the starting ZnO and SnO(2) powders. The microstructure of the sintered samples was examined by scanning electron microscopy and showed that mechanical activation leads to the formation of a structure with reduced particle size which accelerates spinel formation. Grain growth of the spinel phase slows down the densification process and together with the agglomerates formed during mechanical activation causes the appearance of a porous microstructure. The photoacoustic (PA) phase and amplitude spectra of the sintered samples were recorded as a function of the chopped frequency of the laser beam used (red laser with a power of 25 mW, lambda = 632 nm) in a thermal-transmission detection configuration. PA experimental data were analyzed using the Rosenzweig-Gersho thermal-piston model, which enabled determination of the thermal diffusivity, D(T) (m(2) s(-1)), diffusion coefficient of the minority free carriers D (m(2)s(-1)) and the optical absorption coefficient (m(-1)). The detected differences of the measured thermal-electrical properties of the obtained Zn(2)SnO(4) ceramics indicate changes in the material induced by the different preparation procedure of the starting powders before the sintering process.
PB  - Savez hemijskih inženjera, Beograd
C3  - HEMIJSKA INDUSTRIJA
T1  - Photoacoustic spectroscopy investigation of sintered zinc-tin-oxide ceramics
EP  - 146
IS  - 3
SP  - 142
VL  - 61
DO  - 10.2298/HEMIND0703142I
ER  - 

@conference{
author = "Ivetić, Tamara B. and Nikolić, Maria Vesna P. and Pavlović, Vladimir and Nikolić, Pantelija M. and Ristić, Momčilo M.",
year = "2007",
abstract = "In this paper the changes that occured in differently activated ZnO-SnO(2) and sintered samples were investigated using photoacoustic spectroscopy. ZnO and SnO(2) powders, mixed in the molar ratio 2:1, were mechanically activated in a planetary ball mill for 10-160 min. The mixtures were pressed and isothermally sintered at 1300 degrees C for two hours. X-ray diffraction analysis of the obtained sintered samples was performed in order to investigate changes of the phase composition and confirmed only the presence of a pure zinc stannate (Zn(2)SnO(4)) phase in all the sintered samples as a result of the solid state reaction and reaction sintering between the starting ZnO and SnO(2) powders. The microstructure of the sintered samples was examined by scanning electron microscopy and showed that mechanical activation leads to the formation of a structure with reduced particle size which accelerates spinel formation. Grain growth of the spinel phase slows down the densification process and together with the agglomerates formed during mechanical activation causes the appearance of a porous microstructure. The photoacoustic (PA) phase and amplitude spectra of the sintered samples were recorded as a function of the chopped frequency of the laser beam used (red laser with a power of 25 mW, lambda = 632 nm) in a thermal-transmission detection configuration. PA experimental data were analyzed using the Rosenzweig-Gersho thermal-piston model, which enabled determination of the thermal diffusivity, D(T) (m(2) s(-1)), diffusion coefficient of the minority free carriers D (m(2)s(-1)) and the optical absorption coefficient (m(-1)). The detected differences of the measured thermal-electrical properties of the obtained Zn(2)SnO(4) ceramics indicate changes in the material induced by the different preparation procedure of the starting powders before the sintering process.",
publisher = "Savez hemijskih inženjera, Beograd",
journal = "HEMIJSKA INDUSTRIJA",
title = "Photoacoustic spectroscopy investigation of sintered zinc-tin-oxide ceramics",
pages = "146-142",
number = "3",
volume = "61",
doi = "10.2298/HEMIND0703142I"
}

Ivetić, T. B., Nikolić, M. V. P., Pavlović, V., Nikolić, P. M.,& Ristić, M. M.. (2007). Photoacoustic spectroscopy investigation of sintered zinc-tin-oxide ceramics. in HEMIJSKA INDUSTRIJA
Savez hemijskih inženjera, Beograd., 61(3), 142-146.
https://doi.org/10.2298/HEMIND0703142I

Ivetić TB, Nikolić MVP, Pavlović V, Nikolić PM, Ristić MM. Photoacoustic spectroscopy investigation of sintered zinc-tin-oxide ceramics. in HEMIJSKA INDUSTRIJA. 2007;61(3):142-146.
doi:10.2298/HEMIND0703142I .

Ivetić, Tamara B., Nikolić, Maria Vesna P., Pavlović, Vladimir, Nikolić, Pantelija M., Ristić, Momčilo M., "Photoacoustic spectroscopy investigation of sintered zinc-tin-oxide ceramics" in HEMIJSKA INDUSTRIJA, 61, no. 3 (2007):142-146,
https://doi.org/10.2298/HEMIND0703142I . .