TY  - JOUR
AU  - Marković, Bojana M.
AU  - Spasojević, Vojislav V.
AU  - Dapcević, Aleksandra
AU  - Vuković, Zorica M.
AU  - Pavlović, Vladimir
AU  - Randjelović, Danijela, V
AU  - Nastasović, Aleksandra B.
PY  - 2019
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/5029
AB  - Magnetic and non-magnetic macroporous crosslinked copolymers of glycidyl methacrylate and trimethylolpropane trimethacrylate were prepared by suspension copolymerization and functionalized with diethylenetriamine. The samples were characterized by mercury porosimetry, scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDS), Fourier transform infrared spectroscopy analysis (FTIR-ATR), thermogravimetric analysis (TGA), X-ray diffractometry (XRD), atomic force microscopy (AFM), transmission electron microscopy (TEM) and SQUID magnetometry. The FTIR-ATR analysis of synthesized magnetic nanocomposites confirmed the presence of magnetite and successful aminofunctionalization. Non-functionalized and amino-functionalized nanocomposites exhibited superparamagnetic behavior at 300 K, with a saturation magnetization of 5.0 emu/g and 2.9 emu/g, respectively. TEM analysis of the magnetic nanocomposite has shown that magnetic nanoparticles were homogeneously dispersed in the polymer matrix. It was demonstrated that incorporation of magnetic nanoparticles enhanced the thermal stability of the magnetic nanocomposite in comparison to the initial non-magnetic macroporous copolymer.
PB  - Savez hemijskih inženjera, Beograd
T2  - HEMIJSKA INDUSTRIJA
T1  - Characterization of glycidyl methacrylate based magnetic nanocomposites
EP  - 35
IS  - 1
SP  - 25
VL  - 73
DO  - 10.2298/HEMIND181113006M
ER  - 

@article{
author = "Marković, Bojana M. and Spasojević, Vojislav V. and Dapcević, Aleksandra and Vuković, Zorica M. and Pavlović, Vladimir and Randjelović, Danijela, V and Nastasović, Aleksandra B.",
year = "2019",
abstract = "Magnetic and non-magnetic macroporous crosslinked copolymers of glycidyl methacrylate and trimethylolpropane trimethacrylate were prepared by suspension copolymerization and functionalized with diethylenetriamine. The samples were characterized by mercury porosimetry, scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDS), Fourier transform infrared spectroscopy analysis (FTIR-ATR), thermogravimetric analysis (TGA), X-ray diffractometry (XRD), atomic force microscopy (AFM), transmission electron microscopy (TEM) and SQUID magnetometry. The FTIR-ATR analysis of synthesized magnetic nanocomposites confirmed the presence of magnetite and successful aminofunctionalization. Non-functionalized and amino-functionalized nanocomposites exhibited superparamagnetic behavior at 300 K, with a saturation magnetization of 5.0 emu/g and 2.9 emu/g, respectively. TEM analysis of the magnetic nanocomposite has shown that magnetic nanoparticles were homogeneously dispersed in the polymer matrix. It was demonstrated that incorporation of magnetic nanoparticles enhanced the thermal stability of the magnetic nanocomposite in comparison to the initial non-magnetic macroporous copolymer.",
publisher = "Savez hemijskih inženjera, Beograd",
journal = "HEMIJSKA INDUSTRIJA",
title = "Characterization of glycidyl methacrylate based magnetic nanocomposites",
pages = "35-25",
number = "1",
volume = "73",
doi = "10.2298/HEMIND181113006M"
}

Marković, B. M., Spasojević, V. V., Dapcević, A., Vuković, Z. M., Pavlović, V., Randjelović, D. V.,& Nastasović, A. B.. (2019). Characterization of glycidyl methacrylate based magnetic nanocomposites. in HEMIJSKA INDUSTRIJA
Savez hemijskih inženjera, Beograd., 73(1), 25-35.
https://doi.org/10.2298/HEMIND181113006M

Marković BM, Spasojević VV, Dapcević A, Vuković ZM, Pavlović V, Randjelović DV, Nastasović AB. Characterization of glycidyl methacrylate based magnetic nanocomposites. in HEMIJSKA INDUSTRIJA. 2019;73(1):25-35.
doi:10.2298/HEMIND181113006M .

Marković, Bojana M., Spasojević, Vojislav V., Dapcević, Aleksandra, Vuković, Zorica M., Pavlović, Vladimir, Randjelović, Danijela, V, Nastasović, Aleksandra B., "Characterization of glycidyl methacrylate based magnetic nanocomposites" in HEMIJSKA INDUSTRIJA, 73, no. 1 (2019):25-35,
https://doi.org/10.2298/HEMIND181113006M . .

TY  - JOUR
AU  - Nikolić, M.V.
AU  - Vasiljević, Zorka
AU  - Luković, M.D.
AU  - Pavlović, Vera P.
AU  - Krstić, J.B.
AU  - Vujancević, J.
AU  - Tadić, N.
AU  - Vlahović, Branislav
AU  - Pavlović, Vladimir
PY  - 2019
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/5136
AB  - Zinc ferrite nanocrystalline powder was obtained by solid state synthesis of starting zinc oxide and hematite nanopowders. Field emission scanning electron microscopy and transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy and Raman spectroscopy confirmed the formation of nanocrystalline zinc-ferrite powder with a mixed spinel structure with small amounts of remaining zinc oxide and hematite as impurities. Thick film paste was formed and screen printed on test interdigitated PdAg electrodes on alumina substrate. Formation of a porous nanocrystalline structure was confirmed by scanning electron microscopy and Hg porosimetry. Humidity sensing properties of zinc ferrite thick films were investigated by monitoring the change in impedance in the relative humidity interval 30%-90% in the frequency range 42 Hz-1 MHz at room temperature (25°C) and 50°C. At 42 Hz at both analyzed temperatures the impedance reduced ~46 times in the humidity range 30%-90%. The dominant influence of grain boundaries was confirmed by analysis of complex impedance with an equivalent circuit.
PB  - Blackwell Publishing Ltd
T2  - International Journal of Applied Ceramic Technology
T1  - Investigation of ZnFe 2 O 4 spinel ferrite nanocrystalline screen-printed thick films for application in humidity sensing
EP  - 993
IS  - 3
SP  - 981
VL  - 16
DO  - 10.1111/ijac.13190
ER  - 

@article{
author = "Nikolić, M.V. and Vasiljević, Zorka and Luković, M.D. and Pavlović, Vera P. and Krstić, J.B. and Vujancević, J. and Tadić, N. and Vlahović, Branislav and Pavlović, Vladimir",
year = "2019",
abstract = "Zinc ferrite nanocrystalline powder was obtained by solid state synthesis of starting zinc oxide and hematite nanopowders. Field emission scanning electron microscopy and transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy and Raman spectroscopy confirmed the formation of nanocrystalline zinc-ferrite powder with a mixed spinel structure with small amounts of remaining zinc oxide and hematite as impurities. Thick film paste was formed and screen printed on test interdigitated PdAg electrodes on alumina substrate. Formation of a porous nanocrystalline structure was confirmed by scanning electron microscopy and Hg porosimetry. Humidity sensing properties of zinc ferrite thick films were investigated by monitoring the change in impedance in the relative humidity interval 30%-90% in the frequency range 42 Hz-1 MHz at room temperature (25°C) and 50°C. At 42 Hz at both analyzed temperatures the impedance reduced ~46 times in the humidity range 30%-90%. The dominant influence of grain boundaries was confirmed by analysis of complex impedance with an equivalent circuit.",
publisher = "Blackwell Publishing Ltd",
journal = "International Journal of Applied Ceramic Technology",
title = "Investigation of ZnFe 2 O 4 spinel ferrite nanocrystalline screen-printed thick films for application in humidity sensing",
pages = "993-981",
number = "3",
volume = "16",
doi = "10.1111/ijac.13190"
}

Nikolić, M.V., Vasiljević, Z., Luković, M.D., Pavlović, V. P., Krstić, J.B., Vujancević, J., Tadić, N., Vlahović, B.,& Pavlović, V.. (2019). Investigation of ZnFe 2 O 4 spinel ferrite nanocrystalline screen-printed thick films for application in humidity sensing. in International Journal of Applied Ceramic Technology
Blackwell Publishing Ltd., 16(3), 981-993.
https://doi.org/10.1111/ijac.13190

Nikolić M, Vasiljević Z, Luković M, Pavlović VP, Krstić J, Vujancević J, Tadić N, Vlahović B, Pavlović V. Investigation of ZnFe 2 O 4 spinel ferrite nanocrystalline screen-printed thick films for application in humidity sensing. in International Journal of Applied Ceramic Technology. 2019;16(3):981-993.
doi:10.1111/ijac.13190 .

Nikolić, M.V., Vasiljević, Zorka, Luković, M.D., Pavlović, Vera P., Krstić, J.B., Vujancević, J., Tadić, N., Vlahović, Branislav, Pavlović, Vladimir, "Investigation of ZnFe 2 O 4 spinel ferrite nanocrystalline screen-printed thick films for application in humidity sensing" in International Journal of Applied Ceramic Technology, 16, no. 3 (2019):981-993,
https://doi.org/10.1111/ijac.13190 . .

TY  - JOUR
AU  - Obradović, Nina
AU  - Fahrenholtz, William G.
AU  - Filipović, Suzana
AU  - Kosanović, Darko
AU  - Dapčević, A.
AU  - Đorđević, Antonije
AU  - Balać, Igor
AU  - Pavlović, Vladimir
PY  - 2019
UR  - http://www.sciencedirect.com/science/article/pii/S0272884219306340
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/5761
AB  - Magnesium aluminate, MgAl2O4 and other alumina-based spinels are ceramics with high hardness, high melting point and mechanical strenght. Spinels can also be used as dielectrics in microwave applications. The goal of this study was to examine the effects of mechanical activation and sintering temperatures on physico-chemical properties of spinel. MgAl2O4 was produced by solid state reaction between MgO and α-Al2O3. The starting powders were mixed by ball milling to homogenize without significant particle size reduction. Mechanical activation of mixed powders was performed in a high-energy planetary ball mill in air for 1 h. Powders were compacted at 300 MPa. Heat treatments were performed in air, at temperatures ranging from 1200 to 1600 °C with 2 h dwell time, to determine the amount of spinel formation as a function of temperature. Phase composition and microstructure of initial powders and heated samples were determined by means of X-ray diffraction, particle size analysis, and scanning electron microscopy. The influences of milling and consolidation parameters were studied by electrical measurements and mechanical characterization. The main conclusion of this study was that mechanical activation for 60 min initiated a mechano-chemical reaction, resulted in spinel formation at much lower temperatures than within non-activated powders, and indicated that final sintering stage started at much lower temperatures for activated powders. Changes in microstructure parameters, as a consequence of mechanical treatment and subsequent heating of investigated powder mixtures, strongly affect electrical and mechanical properties of the final ceramics.
PB  - Elsevier
T2  - Ceramics International
T1  - The effect of mechanical activation on synthesis and properties of MgAl2O4 ceramics
EP  - 12021
IS  - 9
SP  - 12015
VL  - 45
DO  - 10.1016/j.ceramint.2019.03.095
ER  - 

@article{
author = "Obradović, Nina and Fahrenholtz, William G. and Filipović, Suzana and Kosanović, Darko and Dapčević, A. and Đorđević, Antonije and Balać, Igor and Pavlović, Vladimir",
year = "2019",
abstract = "Magnesium aluminate, MgAl2O4 and other alumina-based spinels are ceramics with high hardness, high melting point and mechanical strenght. Spinels can also be used as dielectrics in microwave applications. The goal of this study was to examine the effects of mechanical activation and sintering temperatures on physico-chemical properties of spinel. MgAl2O4 was produced by solid state reaction between MgO and α-Al2O3. The starting powders were mixed by ball milling to homogenize without significant particle size reduction. Mechanical activation of mixed powders was performed in a high-energy planetary ball mill in air for 1 h. Powders were compacted at 300 MPa. Heat treatments were performed in air, at temperatures ranging from 1200 to 1600 °C with 2 h dwell time, to determine the amount of spinel formation as a function of temperature. Phase composition and microstructure of initial powders and heated samples were determined by means of X-ray diffraction, particle size analysis, and scanning electron microscopy. The influences of milling and consolidation parameters were studied by electrical measurements and mechanical characterization. The main conclusion of this study was that mechanical activation for 60 min initiated a mechano-chemical reaction, resulted in spinel formation at much lower temperatures than within non-activated powders, and indicated that final sintering stage started at much lower temperatures for activated powders. Changes in microstructure parameters, as a consequence of mechanical treatment and subsequent heating of investigated powder mixtures, strongly affect electrical and mechanical properties of the final ceramics.",
publisher = "Elsevier",
journal = "Ceramics International",
title = "The effect of mechanical activation on synthesis and properties of MgAl2O4 ceramics",
pages = "12021-12015",
number = "9",
volume = "45",
doi = "10.1016/j.ceramint.2019.03.095"
}

Obradović, N., Fahrenholtz, W. G., Filipović, S., Kosanović, D., Dapčević, A., Đorđević, A., Balać, I.,& Pavlović, V.. (2019). The effect of mechanical activation on synthesis and properties of MgAl2O4 ceramics. in Ceramics International
Elsevier., 45(9), 12015-12021.
https://doi.org/10.1016/j.ceramint.2019.03.095

Obradović N, Fahrenholtz WG, Filipović S, Kosanović D, Dapčević A, Đorđević A, Balać I, Pavlović V. The effect of mechanical activation on synthesis and properties of MgAl2O4 ceramics. in Ceramics International. 2019;45(9):12015-12021.
doi:10.1016/j.ceramint.2019.03.095 .

Obradović, Nina, Fahrenholtz, William G., Filipović, Suzana, Kosanović, Darko, Dapčević, A., Đorđević, Antonije, Balać, Igor, Pavlović, Vladimir, "The effect of mechanical activation on synthesis and properties of MgAl2O4 ceramics" in Ceramics International, 45, no. 9 (2019):12015-12021,
https://doi.org/10.1016/j.ceramint.2019.03.095 . .

TY  - JOUR
AU  - Obradović, Nina
AU  - Fahrenholtz, William G.
AU  - Filipović, Suzana
AU  - Kosanović, Darko
AU  - Dapčević, A.
AU  - Đorđević, Antonije
AU  - Balać, Igor
AU  - Pavlović, Vladimir B.
PY  - 2019
UR  - http://www.sciencedirect.com/science/article/pii/S0272884219306340
UR  - http://dais.sanu.ac.rs/123456789/5272
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/5740
AB  - Magnesium aluminate, MgAl2O4 and other alumina-based spinels are ceramics with high hardness, high melting point and mechanical strenght. Spinels can also be used as dielectrics in microwave applications. The goal of this study was to examine the effects of mechanical activation and sintering temperatures on physico-chemical properties of spinel. MgAl2O4 was produced by solid state reaction between MgO and α-Al2O3. The starting powders were mixed by ball milling to homogenize without significant particle size reduction. Mechanical activation of mixed powders was performed in a high-energy planetary ball mill in air for 1 h. Powders were compacted at 300 MPa. Heat treatments were performed in air, at temperatures ranging from 1200 to 1600 °C with 2 h dwell time, to determine the amount of spinel formation as a function of temperature. Phase composition and microstructure of initial powders and heated samples were determined by means of X-ray diffraction, particle size analysis, and scanning electron microscopy. The influences of milling and consolidation parameters were studied by electrical measurements and mechanical characterization. The main conclusion of this study was that mechanical activation for 60 min initiated a mechano-chemical reaction, resulted in spinel formation at much lower temperatures than within non-activated powders, and indicated that final sintering stage started at much lower temperatures for activated powders. Changes in microstructure parameters, as a consequence of mechanical treatment and subsequent heating of investigated powder mixtures, strongly affect electrical and mechanical properties of the final ceramics.
PB  - Elsevier
T2  - Ceramics International
T1  - The effect of mechanical activation on synthesis and properties of MgAl2O4 ceramics
EP  - 12021
IS  - 9
SP  - 12015
VL  - 45
DO  - 10.1016/j.ceramint.2019.03.095
ER  - 

@article{
author = "Obradović, Nina and Fahrenholtz, William G. and Filipović, Suzana and Kosanović, Darko and Dapčević, A. and Đorđević, Antonije and Balać, Igor and Pavlović, Vladimir B.",
year = "2019",
abstract = "Magnesium aluminate, MgAl2O4 and other alumina-based spinels are ceramics with high hardness, high melting point and mechanical strenght. Spinels can also be used as dielectrics in microwave applications. The goal of this study was to examine the effects of mechanical activation and sintering temperatures on physico-chemical properties of spinel. MgAl2O4 was produced by solid state reaction between MgO and α-Al2O3. The starting powders were mixed by ball milling to homogenize without significant particle size reduction. Mechanical activation of mixed powders was performed in a high-energy planetary ball mill in air for 1 h. Powders were compacted at 300 MPa. Heat treatments were performed in air, at temperatures ranging from 1200 to 1600 °C with 2 h dwell time, to determine the amount of spinel formation as a function of temperature. Phase composition and microstructure of initial powders and heated samples were determined by means of X-ray diffraction, particle size analysis, and scanning electron microscopy. The influences of milling and consolidation parameters were studied by electrical measurements and mechanical characterization. The main conclusion of this study was that mechanical activation for 60 min initiated a mechano-chemical reaction, resulted in spinel formation at much lower temperatures than within non-activated powders, and indicated that final sintering stage started at much lower temperatures for activated powders. Changes in microstructure parameters, as a consequence of mechanical treatment and subsequent heating of investigated powder mixtures, strongly affect electrical and mechanical properties of the final ceramics.",
publisher = "Elsevier",
journal = "Ceramics International",
title = "The effect of mechanical activation on synthesis and properties of MgAl2O4 ceramics",
pages = "12021-12015",
number = "9",
volume = "45",
doi = "10.1016/j.ceramint.2019.03.095"
}

Obradović, N., Fahrenholtz, W. G., Filipović, S., Kosanović, D., Dapčević, A., Đorđević, A., Balać, I.,& Pavlović, V. B.. (2019). The effect of mechanical activation on synthesis and properties of MgAl2O4 ceramics. in Ceramics International
Elsevier., 45(9), 12015-12021.
https://doi.org/10.1016/j.ceramint.2019.03.095

Obradović N, Fahrenholtz WG, Filipović S, Kosanović D, Dapčević A, Đorđević A, Balać I, Pavlović VB. The effect of mechanical activation on synthesis and properties of MgAl2O4 ceramics. in Ceramics International. 2019;45(9):12015-12021.
doi:10.1016/j.ceramint.2019.03.095 .

Obradović, Nina, Fahrenholtz, William G., Filipović, Suzana, Kosanović, Darko, Dapčević, A., Đorđević, Antonije, Balać, Igor, Pavlović, Vladimir B., "The effect of mechanical activation on synthesis and properties of MgAl2O4 ceramics" in Ceramics International, 45, no. 9 (2019):12015-12021,
https://doi.org/10.1016/j.ceramint.2019.03.095 . .

TY  - JOUR
AU  - Nikolić, Maria Vesna
AU  - Vasiljević, Zorka Z.
AU  - Luković, Miloljub D.
AU  - Pavlović, Vera P.
AU  - Vujancević, Jelena
AU  - Radovanović, Milan
AU  - Krstić, Jugoslav B.
AU  - Vlahović, Branislav
AU  - Pavlović, Vladimir
PY  - 2018
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/4705
AB  - Pseudobrookite based nanopowder was obtained by solid state synthesis of starting hematite and anatase nanopowders in the weight ratio 55:45. Structural and morphological properties were analyzed using X-ray diffraction (XRD), BET, X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, UV/Vis diffuse reflectance spectroscopy, Field emission scanning electron microscopy (FESEM) and Transmission electron microscopy (TEM) confirming the formation of nanocrystalline pseudobrookite. The obtained powder was mixed with a binder (ethyl cellulose), dispersant (alpha-terpinol) and adhesion agents (acetic acid and distilled water) to obtain a thick film paste. It was screen printed on alumina substrate with interdigitated PdAg electrodes and fired at 600 degrees C for 30 min. Formation of a porous nanocrystalline thick film structure was shown using Scanning electron microscopy (SEM), while Hall measurements enabled determination of carrier mobility. Change of impedance response in the frequency range 42 Hz-1 MHz with humidity was analyzed at room temperature (25 degrees C) and 50 degrees C in the relative humidity range 30-90% and 40-90%, respectively. At 42 Hz, and room temperature the impedance reduced similar to 28 times, while at 50 degrees C it reduced similar to 147 times in the relative humidity range 40-90%. The sensor showed rapid response (16 s) and relatively low hysteresis (8.39% at 25 degrees C and 2.64% at 50 degrees C) showing that this is a promising material for application in humidity sensing.
PB  - Elsevier Science Sa, Lausanne
T2  - Sensors and Actuators B-Chemical
T1  - Humidity sensing properties of nanocrystalline pseudobrookite (Fe2TiO5) based thick films
EP  - 664
SP  - 654
VL  - 277
DO  - 10.1016/j.snb.2018.09.063
ER  - 

@article{
author = "Nikolić, Maria Vesna and Vasiljević, Zorka Z. and Luković, Miloljub D. and Pavlović, Vera P. and Vujancević, Jelena and Radovanović, Milan and Krstić, Jugoslav B. and Vlahović, Branislav and Pavlović, Vladimir",
year = "2018",
abstract = "Pseudobrookite based nanopowder was obtained by solid state synthesis of starting hematite and anatase nanopowders in the weight ratio 55:45. Structural and morphological properties were analyzed using X-ray diffraction (XRD), BET, X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, UV/Vis diffuse reflectance spectroscopy, Field emission scanning electron microscopy (FESEM) and Transmission electron microscopy (TEM) confirming the formation of nanocrystalline pseudobrookite. The obtained powder was mixed with a binder (ethyl cellulose), dispersant (alpha-terpinol) and adhesion agents (acetic acid and distilled water) to obtain a thick film paste. It was screen printed on alumina substrate with interdigitated PdAg electrodes and fired at 600 degrees C for 30 min. Formation of a porous nanocrystalline thick film structure was shown using Scanning electron microscopy (SEM), while Hall measurements enabled determination of carrier mobility. Change of impedance response in the frequency range 42 Hz-1 MHz with humidity was analyzed at room temperature (25 degrees C) and 50 degrees C in the relative humidity range 30-90% and 40-90%, respectively. At 42 Hz, and room temperature the impedance reduced similar to 28 times, while at 50 degrees C it reduced similar to 147 times in the relative humidity range 40-90%. The sensor showed rapid response (16 s) and relatively low hysteresis (8.39% at 25 degrees C and 2.64% at 50 degrees C) showing that this is a promising material for application in humidity sensing.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Sensors and Actuators B-Chemical",
title = "Humidity sensing properties of nanocrystalline pseudobrookite (Fe2TiO5) based thick films",
pages = "664-654",
volume = "277",
doi = "10.1016/j.snb.2018.09.063"
}

Nikolić, M. V., Vasiljević, Z. Z., Luković, M. D., Pavlović, V. P., Vujancević, J., Radovanović, M., Krstić, J. B., Vlahović, B.,& Pavlović, V.. (2018). Humidity sensing properties of nanocrystalline pseudobrookite (Fe2TiO5) based thick films. in Sensors and Actuators B-Chemical
Elsevier Science Sa, Lausanne., 277, 654-664.
https://doi.org/10.1016/j.snb.2018.09.063

Nikolić MV, Vasiljević ZZ, Luković MD, Pavlović VP, Vujancević J, Radovanović M, Krstić JB, Vlahović B, Pavlović V. Humidity sensing properties of nanocrystalline pseudobrookite (Fe2TiO5) based thick films. in Sensors and Actuators B-Chemical. 2018;277:654-664.
doi:10.1016/j.snb.2018.09.063 .

Nikolić, Maria Vesna, Vasiljević, Zorka Z., Luković, Miloljub D., Pavlović, Vera P., Vujancević, Jelena, Radovanović, Milan, Krstić, Jugoslav B., Vlahović, Branislav, Pavlović, Vladimir, "Humidity sensing properties of nanocrystalline pseudobrookite (Fe2TiO5) based thick films" in Sensors and Actuators B-Chemical, 277 (2018):654-664,
https://doi.org/10.1016/j.snb.2018.09.063 . .

TY  - JOUR
AU  - Filipović, Suzana
AU  - Obradović, Nina
AU  - Marković, Smilja
AU  - Djordjević, Antonije
AU  - Balac, Igor
AU  - Dapcević, Aleksandra
AU  - Rogan, Jelena
AU  - Pavlović, Vladimir
PY  - 2018
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/4712
AB  - Corundum (alpha-alumina) is a suiTab. material for usage in various industry fields owing to its chemical stability, electrical and mechanical features. It is known that properties of ceramics could be modified by addition of different oxides, as well as by changing the consolidation parameters. In this respect, alumina was doped with 1 wt.% of Cr2O3, Mn2O3 and NiO, followed by 1 hour of mechanical activation in a high-energy planetary ball mill. A sensitive dilatometer was used for sintering of powder mixtures up to 1400 degrees C and recording the obtained dilatation. The final density varied between cca. 1.9 and 3.3 g/cm(3). Microstructural changes were detected by SEM measurements. Changes in electrical permittivity and loss tangent were associated with the preparation conditions (types of additives, duration of mechanical activation). For a given mixture, the sintering increases the relative permittivity and decreases losses, exhibiting the optimal values of 8.32 and 0.027, respectively, for the sample activated 60 minutes and sintered, with the addition of MnO2. Mechanical measurements indicate significant differences in strength with the addition of different transition metal oxides. Samples with Mn and Ni, activated and sintered, with strength of 121 and 86 MPa, respectively, have a significantly higher tensile strength than the other tested samples, due to their more compact microstructures.
PB  - Međunarodni Institut za nauku o sinterovanju, Beograd
T2  - Science of Sintering
T1  - Physical Properties of Sintered Alumina Doped with Different Oxides
EP  - 419
IS  - 4
SP  - 409
VL  - 50
DO  - 10.2298/SOS1804409F
ER  - 

@article{
author = "Filipović, Suzana and Obradović, Nina and Marković, Smilja and Djordjević, Antonije and Balac, Igor and Dapcević, Aleksandra and Rogan, Jelena and Pavlović, Vladimir",
year = "2018",
abstract = "Corundum (alpha-alumina) is a suiTab. material for usage in various industry fields owing to its chemical stability, electrical and mechanical features. It is known that properties of ceramics could be modified by addition of different oxides, as well as by changing the consolidation parameters. In this respect, alumina was doped with 1 wt.% of Cr2O3, Mn2O3 and NiO, followed by 1 hour of mechanical activation in a high-energy planetary ball mill. A sensitive dilatometer was used for sintering of powder mixtures up to 1400 degrees C and recording the obtained dilatation. The final density varied between cca. 1.9 and 3.3 g/cm(3). Microstructural changes were detected by SEM measurements. Changes in electrical permittivity and loss tangent were associated with the preparation conditions (types of additives, duration of mechanical activation). For a given mixture, the sintering increases the relative permittivity and decreases losses, exhibiting the optimal values of 8.32 and 0.027, respectively, for the sample activated 60 minutes and sintered, with the addition of MnO2. Mechanical measurements indicate significant differences in strength with the addition of different transition metal oxides. Samples with Mn and Ni, activated and sintered, with strength of 121 and 86 MPa, respectively, have a significantly higher tensile strength than the other tested samples, due to their more compact microstructures.",
publisher = "Međunarodni Institut za nauku o sinterovanju, Beograd",
journal = "Science of Sintering",
title = "Physical Properties of Sintered Alumina Doped with Different Oxides",
pages = "419-409",
number = "4",
volume = "50",
doi = "10.2298/SOS1804409F"
}

Filipović, S., Obradović, N., Marković, S., Djordjević, A., Balac, I., Dapcević, A., Rogan, J.,& Pavlović, V.. (2018). Physical Properties of Sintered Alumina Doped with Different Oxides. in Science of Sintering
Međunarodni Institut za nauku o sinterovanju, Beograd., 50(4), 409-419.
https://doi.org/10.2298/SOS1804409F

Filipović S, Obradović N, Marković S, Djordjević A, Balac I, Dapcević A, Rogan J, Pavlović V. Physical Properties of Sintered Alumina Doped with Different Oxides. in Science of Sintering. 2018;50(4):409-419.
doi:10.2298/SOS1804409F .

Filipović, Suzana, Obradović, Nina, Marković, Smilja, Djordjević, Antonije, Balac, Igor, Dapcević, Aleksandra, Rogan, Jelena, Pavlović, Vladimir, "Physical Properties of Sintered Alumina Doped with Different Oxides" in Science of Sintering, 50, no. 4 (2018):409-419,
https://doi.org/10.2298/SOS1804409F . .

TY  - JOUR
AU  - Nikolić, M.V.
AU  - Sekulić, D.L.
AU  - Vasiljević, Zorka
AU  - Luković, M.D.
AU  - Pavlović, Vladimir
AU  - Aleksić, O.S.
PY  - 2017
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/4367
AB  - In this work we have investigated changes in dielectric properties, electrical conductivity and complex impedance of Fe2TiO5 nanopowder compacts and bulk samples as a function of elevated temperature (room to 423 K compacts, to 443 K bulk samples), frequency (100 Hz-1 MHz) and composition (starting molar ratio of Fe2O3 and TiO2 1:1-PSB11 and 1:1.5-PSB115). XRD, SEM and TEM analysis of PSB11 and PSB115 powders obtained by a simple solid state process from starting hematite and anatase nanopowders confirmed the formation of nanostructured orthorhombic pseudobrookite with small amounts of excess hematite and rutile. The dielectric constant decreased with frequency and temperature for both compacts and bulk samples. Higher values were determined for bulk samples also reflecting the influence of sample composition. Change in the dielectric loss also reflected the influence of sample composition showing one maximum at high frequencies for compacts, and two maxima at room temperature for bulk samples. Complex impedance was analyzed using equivalent circuits and showed in the case of compacts the influence of both grain and grain boundary components, while in the case of bulk samples the dominant influence of grain boundaries. The temperature dependence of the determined grain and grain boundary resistance for compacts and grain boundary resistance for bulk samples was analyzed using the adiabatic small polaron hopping model enabling determination of activation energies for conduction, while the temperature dependence of relaxation times enabled determination of activation energies for relaxation. Changes in electrical conductivity for compacts and bulk samples followed Jonscher's power law. The change of the determined frequency constant with temperature showed that at elevated temperatures the quantum mechanical-tunneling model for the case of small polaron hopping explains the conduction mechanism occurring in both compacts and bulk samples.
PB  - Springer, Dordrecht
T2  - Journal of Materials Science-Materials in Electronics
T1  - Dielectric properties, complex impedance and electrical conductivity of Fe2TiO5 nanopowder compacts and bulk samples at elevated temperatures
EP  - 4806
IS  - 6
SP  - 4796
VL  - 28
DO  - 10.1007/s10854-016-6125-6
ER  - 

@article{
author = "Nikolić, M.V. and Sekulić, D.L. and Vasiljević, Zorka and Luković, M.D. and Pavlović, Vladimir and Aleksić, O.S.",
year = "2017",
abstract = "In this work we have investigated changes in dielectric properties, electrical conductivity and complex impedance of Fe2TiO5 nanopowder compacts and bulk samples as a function of elevated temperature (room to 423 K compacts, to 443 K bulk samples), frequency (100 Hz-1 MHz) and composition (starting molar ratio of Fe2O3 and TiO2 1:1-PSB11 and 1:1.5-PSB115). XRD, SEM and TEM analysis of PSB11 and PSB115 powders obtained by a simple solid state process from starting hematite and anatase nanopowders confirmed the formation of nanostructured orthorhombic pseudobrookite with small amounts of excess hematite and rutile. The dielectric constant decreased with frequency and temperature for both compacts and bulk samples. Higher values were determined for bulk samples also reflecting the influence of sample composition. Change in the dielectric loss also reflected the influence of sample composition showing one maximum at high frequencies for compacts, and two maxima at room temperature for bulk samples. Complex impedance was analyzed using equivalent circuits and showed in the case of compacts the influence of both grain and grain boundary components, while in the case of bulk samples the dominant influence of grain boundaries. The temperature dependence of the determined grain and grain boundary resistance for compacts and grain boundary resistance for bulk samples was analyzed using the adiabatic small polaron hopping model enabling determination of activation energies for conduction, while the temperature dependence of relaxation times enabled determination of activation energies for relaxation. Changes in electrical conductivity for compacts and bulk samples followed Jonscher's power law. The change of the determined frequency constant with temperature showed that at elevated temperatures the quantum mechanical-tunneling model for the case of small polaron hopping explains the conduction mechanism occurring in both compacts and bulk samples.",
publisher = "Springer, Dordrecht",
journal = "Journal of Materials Science-Materials in Electronics",
title = "Dielectric properties, complex impedance and electrical conductivity of Fe2TiO5 nanopowder compacts and bulk samples at elevated temperatures",
pages = "4806-4796",
number = "6",
volume = "28",
doi = "10.1007/s10854-016-6125-6"
}

Nikolić, M.V., Sekulić, D.L., Vasiljević, Z., Luković, M.D., Pavlović, V.,& Aleksić, O.S.. (2017). Dielectric properties, complex impedance and electrical conductivity of Fe2TiO5 nanopowder compacts and bulk samples at elevated temperatures. in Journal of Materials Science-Materials in Electronics
Springer, Dordrecht., 28(6), 4796-4806.
https://doi.org/10.1007/s10854-016-6125-6

Nikolić M, Sekulić D, Vasiljević Z, Luković M, Pavlović V, Aleksić O. Dielectric properties, complex impedance and electrical conductivity of Fe2TiO5 nanopowder compacts and bulk samples at elevated temperatures. in Journal of Materials Science-Materials in Electronics. 2017;28(6):4796-4806.
doi:10.1007/s10854-016-6125-6 .

Nikolić, M.V., Sekulić, D.L., Vasiljević, Zorka, Luković, M.D., Pavlović, Vladimir, Aleksić, O.S., "Dielectric properties, complex impedance and electrical conductivity of Fe2TiO5 nanopowder compacts and bulk samples at elevated temperatures" in Journal of Materials Science-Materials in Electronics, 28, no. 6 (2017):4796-4806,
https://doi.org/10.1007/s10854-016-6125-6 . .

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  - JOUR
AU  - Obradović, N.
AU  - Nikolić, M.V.
AU  - Nikolić, N.
AU  - Filipović, Suzana
AU  - Mitrić, M.
AU  - Pavlović, Vladimir
AU  - Nikolić, P.M.
AU  - Djordjević, Antonije
AU  - Ristić, M.M.
PY  - 2012
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/3052
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.
PB  - Međunarodni Institut za nauku o sinterovanju, Beograd
T2  - Science of Sintering
T1  - Synthesis of Barium-zinc-titanate Ceramics
EP  - 71
IS  - 1
SP  - 65
VL  - 44
DO  - 10.2298/SOS1201065O
ER  - 

@article{
author = "Obradović, N. and Nikolić, M.V. and Nikolić, N. and Filipović, Suzana and Mitrić, M. and Pavlović, Vladimir and Nikolić, P.M. and Djordjević, Antonije and Ristić, 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.",
publisher = "Međunarodni Institut za nauku o sinterovanju, Beograd",
journal = "Science of Sintering",
title = "Synthesis of Barium-zinc-titanate Ceramics",
pages = "71-65",
number = "1",
volume = "44",
doi = "10.2298/SOS1201065O"
}

Obradović, N., Nikolić, M.V., Nikolić, N., Filipović, S., Mitrić, M., Pavlović, V., Nikolić, P.M., Djordjević, A.,& Ristić, M.M.. (2012). Synthesis of Barium-zinc-titanate Ceramics. in Science of Sintering
Međunarodni Institut za nauku o sinterovanju, Beograd., 44(1), 65-71.
https://doi.org/10.2298/SOS1201065O

Obradović N, Nikolić M, Nikolić N, Filipović S, Mitrić M, Pavlović V, Nikolić P, Djordjević A, Ristić M. Synthesis of Barium-zinc-titanate Ceramics. in Science of Sintering. 2012;44(1):65-71.
doi:10.2298/SOS1201065O .

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