TY  - JOUR
AU  - Kosanović, Darko
AU  - Blagojević, Vladimir A.
AU  - Maricić, A.
AU  - Aleksić, S.
AU  - Pavlović, Vera P.
AU  - Pavlović, Vladimir
AU  - Vlahović, Branislav
PY  - 2018
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/4755
AB  - Barium hexaferrite ceramics were prepared using mechanically activated mixtures of iron and barium titanate. The 60:40 mass% Fe:BaTiO3 powder mixtures were mechanically activated for different times (100-240 min) and sintered at 1100 and 1200 degrees C in order to determine the influence of mechanical activation of the precursor on the magnetic and dielectric properties of the resulting barium hexaferrite ceramics. The final product contained 84-89 mass% of Ba2Fe22.46O38Ti1.54 phase, with higher content corresponding to longer mechanical activation of the precursor. XRD and Raman measurements indicated that the remainder of the sample consists of leftover BaTiO3 and hematite, which was formed by the oxidation of iron during mechanical activation and sintering in air. Magnetic properties of samples sintered at 1200 degrees C are superior to those sintered at 1100 degrees C, which can be attributed to higher Ba2Fe22.46O38Ti1.54 phase content. The position of the Curie temperature in 350-420 degrees C temperature region is consistent with 0.8:1 ratio of Ti to Ba. Maximum magnetization was observed for samples activated for 120 min. Dielectric properties of samples sintered at 1200 degrees C showed a dependence on frequency, with a significant drop in relative permittivity with an increase in frequency in the low-frequency region, and relatively constant values of relative permittivity in the high-frequency region. The tangent loss showed a decrease with increase in frequency, where peaks corresponding to the resonance of the electron hopping frequency with the external field were observed in the samples corresponding to the longer mechanical activation. Dielectric properties showed relatively small changes for samples activated longer than 150 min.
PB  - Elsevier Sci Ltd, Oxford
T2  - Ceramics International
T1  - Influence of mechanical activation on functional properties of barium hexaferrite ceramics
EP  - 6672
IS  - 6
SP  - 6666
VL  - 44
DO  - 10.1016/j.ceramint.2018.01.078
ER  - 

@article{
author = "Kosanović, Darko and Blagojević, Vladimir A. and Maricić, A. and Aleksić, S. and Pavlović, Vera P. and Pavlović, Vladimir and Vlahović, Branislav",
year = "2018",
abstract = "Barium hexaferrite ceramics were prepared using mechanically activated mixtures of iron and barium titanate. The 60:40 mass% Fe:BaTiO3 powder mixtures were mechanically activated for different times (100-240 min) and sintered at 1100 and 1200 degrees C in order to determine the influence of mechanical activation of the precursor on the magnetic and dielectric properties of the resulting barium hexaferrite ceramics. The final product contained 84-89 mass% of Ba2Fe22.46O38Ti1.54 phase, with higher content corresponding to longer mechanical activation of the precursor. XRD and Raman measurements indicated that the remainder of the sample consists of leftover BaTiO3 and hematite, which was formed by the oxidation of iron during mechanical activation and sintering in air. Magnetic properties of samples sintered at 1200 degrees C are superior to those sintered at 1100 degrees C, which can be attributed to higher Ba2Fe22.46O38Ti1.54 phase content. The position of the Curie temperature in 350-420 degrees C temperature region is consistent with 0.8:1 ratio of Ti to Ba. Maximum magnetization was observed for samples activated for 120 min. Dielectric properties of samples sintered at 1200 degrees C showed a dependence on frequency, with a significant drop in relative permittivity with an increase in frequency in the low-frequency region, and relatively constant values of relative permittivity in the high-frequency region. The tangent loss showed a decrease with increase in frequency, where peaks corresponding to the resonance of the electron hopping frequency with the external field were observed in the samples corresponding to the longer mechanical activation. Dielectric properties showed relatively small changes for samples activated longer than 150 min.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Ceramics International",
title = "Influence of mechanical activation on functional properties of barium hexaferrite ceramics",
pages = "6672-6666",
number = "6",
volume = "44",
doi = "10.1016/j.ceramint.2018.01.078"
}

Kosanović, D., Blagojević, V. A., Maricić, A., Aleksić, S., Pavlović, V. P., Pavlović, V.,& Vlahović, B.. (2018). Influence of mechanical activation on functional properties of barium hexaferrite ceramics. in Ceramics International
Elsevier Sci Ltd, Oxford., 44(6), 6666-6672.
https://doi.org/10.1016/j.ceramint.2018.01.078

Kosanović D, Blagojević VA, Maricić A, Aleksić S, Pavlović VP, Pavlović V, Vlahović B. Influence of mechanical activation on functional properties of barium hexaferrite ceramics. in Ceramics International. 2018;44(6):6666-6672.
doi:10.1016/j.ceramint.2018.01.078 .

Kosanović, Darko, Blagojević, Vladimir A., Maricić, A., Aleksić, S., Pavlović, Vera P., Pavlović, Vladimir, Vlahović, Branislav, "Influence of mechanical activation on functional properties of barium hexaferrite ceramics" in Ceramics International, 44, no. 6 (2018):6666-6672,
https://doi.org/10.1016/j.ceramint.2018.01.078 . .

TY  - JOUR
AU  - Kosanović, Darko
AU  - Obradović, N.
AU  - Pavlović, Vera P.
AU  - Marković, S.
AU  - Maricić, A.
AU  - Rasić, G.
AU  - Vlahović, Branislav
AU  - Pavlović, Vladimir
AU  - Ristić, M.M.
PY  - 2016
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/4010
AB  - Crystal structure and morphology of mechanically activated nanocrystalline Fe/BaTiO3 was investigated using a combination of spectroscopic and microscopic methods. These show that mechanical activation led to the creation of new surfaces and the comminution of the initial powder particles. Prolonged milling resulted in formation of larger agglomerates of BaTiO3 and bimodal particle size distribution, where BaTiO3 particles were significantly larger than those of iron-containing phases. Milling times of 210 min and above lead to a significant decrease in temperature of the oxidation of iron in the sample, indicating abrupt change in reactivity. Raman spectroscopy analysis has revealed that activation had a pronounced influence on Fe/BaTiO3 lattice, thereby affecting both the stability of the crystal structure and the phase transition phenomena.
PB  - Elsevier, Amsterdam
T2  - Materials Science and Engineering B-Advanced Functional Solid-State Materials
T1  - The influence of mechanical activation on the morphological changes of Fe/BaTiO3 powder
EP  - 95
SP  - 89
VL  - 212
DO  - 10.1016/j.mseb.2016.07.016
ER  - 

@article{
author = "Kosanović, Darko and Obradović, N. and Pavlović, Vera P. and Marković, S. and Maricić, A. and Rasić, G. and Vlahović, Branislav and Pavlović, Vladimir and Ristić, M.M.",
year = "2016",
abstract = "Crystal structure and morphology of mechanically activated nanocrystalline Fe/BaTiO3 was investigated using a combination of spectroscopic and microscopic methods. These show that mechanical activation led to the creation of new surfaces and the comminution of the initial powder particles. Prolonged milling resulted in formation of larger agglomerates of BaTiO3 and bimodal particle size distribution, where BaTiO3 particles were significantly larger than those of iron-containing phases. Milling times of 210 min and above lead to a significant decrease in temperature of the oxidation of iron in the sample, indicating abrupt change in reactivity. Raman spectroscopy analysis has revealed that activation had a pronounced influence on Fe/BaTiO3 lattice, thereby affecting both the stability of the crystal structure and the phase transition phenomena.",
publisher = "Elsevier, Amsterdam",
journal = "Materials Science and Engineering B-Advanced Functional Solid-State Materials",
title = "The influence of mechanical activation on the morphological changes of Fe/BaTiO3 powder",
pages = "95-89",
volume = "212",
doi = "10.1016/j.mseb.2016.07.016"
}

Kosanović, D., Obradović, N., Pavlović, V. P., Marković, S., Maricić, A., Rasić, G., Vlahović, B., Pavlović, V.,& Ristić, M.M.. (2016). The influence of mechanical activation on the morphological changes of Fe/BaTiO3 powder. in Materials Science and Engineering B-Advanced Functional Solid-State Materials
Elsevier, Amsterdam., 212, 89-95.
https://doi.org/10.1016/j.mseb.2016.07.016

Kosanović D, Obradović N, Pavlović VP, Marković S, Maricić A, Rasić G, Vlahović B, Pavlović V, Ristić M. The influence of mechanical activation on the morphological changes of Fe/BaTiO3 powder. in Materials Science and Engineering B-Advanced Functional Solid-State Materials. 2016;212:89-95.
doi:10.1016/j.mseb.2016.07.016 .

Kosanović, Darko, Obradović, N., Pavlović, Vera P., Marković, S., Maricić, A., Rasić, G., Vlahović, Branislav, Pavlović, Vladimir, Ristić, M.M., "The influence of mechanical activation on the morphological changes of Fe/BaTiO3 powder" in Materials Science and Engineering B-Advanced Functional Solid-State Materials, 212 (2016):89-95,
https://doi.org/10.1016/j.mseb.2016.07.016 . .

TY  - JOUR
AU  - Ribić-Zelenović, L.
AU  - Cirović, N.
AU  - Spasojević, M.
AU  - Mitrović, N.
AU  - Maricić, A.
AU  - Pavlović, Vladimir
PY  - 2012
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/2958
AB  - A nanostructured Ni-Fe-W powder was obtained by electrodeposition from ammonium citrate electrolyte within the current density range of 500-1000 mA cm(-2) at the electrolyte temperature of 50 degrees C -70 degrees C. XRD analysis shows that the powder contains an amorphous matrix having embedded nanocrystals of the FCC solid solution of iron and tungsten in nickel, with an average crystal grain size of 3.4 nm, a high internal microstrain value and a high density of chaotically distributed dislocations. EDS analysis exhibits that the chemical composition of the Ni-24%Fe-11%W powder does not depend upon current density and electrolyte temperature due to the diffusion control of the process of code-position of nickel, iron and tungsten. SEM micrographs show that the electrodeposition results in the formation of two particle shapes: large cauliflower-like particles and small dendrite particles. The cauliflower-like particles contain deep cavities at hydrogen evolution sites. Cavity density increases with increasing deposition current density. Smaller powder particles are formed at higher temperatures and at higher current densities. During the first heating, relative magnetic permeability decreases reaching the Curie temperature at about 350 degrees C and after cooling exhibits a 12% increase due to the performed relaxation process. Following the second heating to 500 degrees C, the magnetic permeability of the powder is about 5% lower than that of the as-prepared powder due to crystallization of the amorphous phase of the powder and the crystal grain growth in FCC phase.
PB  - Elsevier Science Sa, Lausanne
T2  - Materials Chemistry and Physics
T1  - Microstructural properties of electrochemically prepared Ni-Fe-W powders
EP  - 219
IS  - 1
SP  - 212
VL  - 135
DO  - 10.1016/j.matchemphys.2012.04.061
ER  - 

@article{
author = "Ribić-Zelenović, L. and Cirović, N. and Spasojević, M. and Mitrović, N. and Maricić, A. and Pavlović, Vladimir",
year = "2012",
abstract = "A nanostructured Ni-Fe-W powder was obtained by electrodeposition from ammonium citrate electrolyte within the current density range of 500-1000 mA cm(-2) at the electrolyte temperature of 50 degrees C -70 degrees C. XRD analysis shows that the powder contains an amorphous matrix having embedded nanocrystals of the FCC solid solution of iron and tungsten in nickel, with an average crystal grain size of 3.4 nm, a high internal microstrain value and a high density of chaotically distributed dislocations. EDS analysis exhibits that the chemical composition of the Ni-24%Fe-11%W powder does not depend upon current density and electrolyte temperature due to the diffusion control of the process of code-position of nickel, iron and tungsten. SEM micrographs show that the electrodeposition results in the formation of two particle shapes: large cauliflower-like particles and small dendrite particles. The cauliflower-like particles contain deep cavities at hydrogen evolution sites. Cavity density increases with increasing deposition current density. Smaller powder particles are formed at higher temperatures and at higher current densities. During the first heating, relative magnetic permeability decreases reaching the Curie temperature at about 350 degrees C and after cooling exhibits a 12% increase due to the performed relaxation process. Following the second heating to 500 degrees C, the magnetic permeability of the powder is about 5% lower than that of the as-prepared powder due to crystallization of the amorphous phase of the powder and the crystal grain growth in FCC phase.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Materials Chemistry and Physics",
title = "Microstructural properties of electrochemically prepared Ni-Fe-W powders",
pages = "219-212",
number = "1",
volume = "135",
doi = "10.1016/j.matchemphys.2012.04.061"
}

Ribić-Zelenović, L., Cirović, N., Spasojević, M., Mitrović, N., Maricić, A.,& Pavlović, V.. (2012). Microstructural properties of electrochemically prepared Ni-Fe-W powders. in Materials Chemistry and Physics
Elsevier Science Sa, Lausanne., 135(1), 212-219.
https://doi.org/10.1016/j.matchemphys.2012.04.061

Ribić-Zelenović L, Cirović N, Spasojević M, Mitrović N, Maricić A, Pavlović V. Microstructural properties of electrochemically prepared Ni-Fe-W powders. in Materials Chemistry and Physics. 2012;135(1):212-219.
doi:10.1016/j.matchemphys.2012.04.061 .

Ribić-Zelenović, L., Cirović, N., Spasojević, M., Mitrović, N., Maricić, A., Pavlović, Vladimir, "Microstructural properties of electrochemically prepared Ni-Fe-W powders" in Materials Chemistry and Physics, 135, no. 1 (2012):212-219,
https://doi.org/10.1016/j.matchemphys.2012.04.061 . .

TY  - JOUR
AU  - Kosanović, Darko
AU  - Obradović, N.
AU  - Zivojinović, J.
AU  - Filipović, Suzana
AU  - Maricić, A.
AU  - Pavlović, Vladimir
AU  - Tang, Y.
AU  - Ristić, M.M.
PY  - 2012
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/3040
AB  - Barium-Strontium-Titanate Ba0.77Sr0.23TiO3 was prepared from starting materials BaCO3, SrCO3 and TiO2 through solid-state reactions. Mixtures of these oxides are mechanically activated in a high-energy planetary ball mill at different time intervals from 0 to 120 minutes. In order to obtain information on phase composition, crystal structure was determent by X-ray diffraction. It was observed that after 80 minutes in process synthesis Ba0.77Sr0.23TiO3 started Thermal analyzes were performed in order to determine the characteristic temperatures of the processes that occur in the solid phase. Particle size distribution, together with electron microscopy scanning has given us very useful information about the morphology of the powder.
PB  - Međunarodni Institut za nauku o sinterovanju, Beograd
T2  - Science of Sintering
T1  - Mechanical-Chemical Synthesis Ba0.77Sr0.23TiO3
EP  - 55
IS  - 1
SP  - 47
VL  - 44
DO  - 10.2298/SOS1201047K
ER  - 

@article{
author = "Kosanović, Darko and Obradović, N. and Zivojinović, J. and Filipović, Suzana and Maricić, A. and Pavlović, Vladimir and Tang, Y. and Ristić, M.M.",
year = "2012",
abstract = "Barium-Strontium-Titanate Ba0.77Sr0.23TiO3 was prepared from starting materials BaCO3, SrCO3 and TiO2 through solid-state reactions. Mixtures of these oxides are mechanically activated in a high-energy planetary ball mill at different time intervals from 0 to 120 minutes. In order to obtain information on phase composition, crystal structure was determent by X-ray diffraction. It was observed that after 80 minutes in process synthesis Ba0.77Sr0.23TiO3 started Thermal analyzes were performed in order to determine the characteristic temperatures of the processes that occur in the solid phase. Particle size distribution, together with electron microscopy scanning has given us very useful information about the morphology of the powder.",
publisher = "Međunarodni Institut za nauku o sinterovanju, Beograd",
journal = "Science of Sintering",
title = "Mechanical-Chemical Synthesis Ba0.77Sr0.23TiO3",
pages = "55-47",
number = "1",
volume = "44",
doi = "10.2298/SOS1201047K"
}

Kosanović, D., Obradović, N., Zivojinović, J., Filipović, S., Maricić, A., Pavlović, V., Tang, Y.,& Ristić, M.M.. (2012). Mechanical-Chemical Synthesis Ba0.77Sr0.23TiO3. in Science of Sintering
Međunarodni Institut za nauku o sinterovanju, Beograd., 44(1), 47-55.
https://doi.org/10.2298/SOS1201047K

Kosanović D, Obradović N, Zivojinović J, Filipović S, Maricić A, Pavlović V, Tang Y, Ristić M. Mechanical-Chemical Synthesis Ba0.77Sr0.23TiO3. in Science of Sintering. 2012;44(1):47-55.
doi:10.2298/SOS1201047K .

Kosanović, Darko, Obradović, N., Zivojinović, J., Filipović, Suzana, Maricić, A., Pavlović, Vladimir, Tang, Y., Ristić, M.M., "Mechanical-Chemical Synthesis Ba0.77Sr0.23TiO3" in Science of Sintering, 44, no. 1 (2012):47-55,
https://doi.org/10.2298/SOS1201047K . .

TY  - JOUR
AU  - Kosanović, Darko
AU  - Obradović, N.
AU  - Zivojinović, J.
AU  - Maricić, A.
AU  - Pavlović, Vera P.
AU  - Pavlović, Vladimir
AU  - Ristić, M.M.
PY  - 2012
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/3050
AB  - In this article the influence of mechanical activation on sintering process of barium-strontium-titanate ceramics has been investigated. Both non-activated and mixtures treated in a planetary ball mill for 5, 10, 20, 40, 80 and 120 minutes were sintered at 1100-1400 degrees C for 2 hours in presence of air atmosphere. The influence of mechanical activation on phase composition and crystal structure has been analyzed by XRD, while the effect of activation and sintering process on microstructure was investigated by scanning electron microscopy. It has been established that temperature of 1100 degrees C was too low to induce final sintering stage for this system. Electrical measurements have been conducted for the densest ceramics sintered at 1400 degrees C for 2 hours.
PB  - Međunarodni Institut za nauku o sinterovanju, Beograd
T2  - Science of Sintering
T1  - The Influence of Mechanical Activation on Sintering Process of BaCO3-SrCO3-TiO2 System
EP  - 280
IS  - 3
SP  - 271
VL  - 44
DO  - 10.2298/SOS1203271K
ER  - 

@article{
author = "Kosanović, Darko and Obradović, N. and Zivojinović, J. and Maricić, A. and Pavlović, Vera P. and Pavlović, Vladimir and Ristić, M.M.",
year = "2012",
abstract = "In this article the influence of mechanical activation on sintering process of barium-strontium-titanate ceramics has been investigated. Both non-activated and mixtures treated in a planetary ball mill for 5, 10, 20, 40, 80 and 120 minutes were sintered at 1100-1400 degrees C for 2 hours in presence of air atmosphere. The influence of mechanical activation on phase composition and crystal structure has been analyzed by XRD, while the effect of activation and sintering process on microstructure was investigated by scanning electron microscopy. It has been established that temperature of 1100 degrees C was too low to induce final sintering stage for this system. Electrical measurements have been conducted for the densest ceramics sintered at 1400 degrees C for 2 hours.",
publisher = "Međunarodni Institut za nauku o sinterovanju, Beograd",
journal = "Science of Sintering",
title = "The Influence of Mechanical Activation on Sintering Process of BaCO3-SrCO3-TiO2 System",
pages = "280-271",
number = "3",
volume = "44",
doi = "10.2298/SOS1203271K"
}

Kosanović, D., Obradović, N., Zivojinović, J., Maricić, A., Pavlović, V. P., Pavlović, V.,& Ristić, M.M.. (2012). The Influence of Mechanical Activation on Sintering Process of BaCO3-SrCO3-TiO2 System. in Science of Sintering
Međunarodni Institut za nauku o sinterovanju, Beograd., 44(3), 271-280.
https://doi.org/10.2298/SOS1203271K

Kosanović D, Obradović N, Zivojinović J, Maricić A, Pavlović VP, Pavlović V, Ristić M. The Influence of Mechanical Activation on Sintering Process of BaCO3-SrCO3-TiO2 System. in Science of Sintering. 2012;44(3):271-280.
doi:10.2298/SOS1203271K .

Kosanović, Darko, Obradović, N., Zivojinović, J., Maricić, A., Pavlović, Vera P., Pavlović, Vladimir, Ristić, M.M., "The Influence of Mechanical Activation on Sintering Process of BaCO3-SrCO3-TiO2 System" in Science of Sintering, 44, no. 3 (2012):271-280,
https://doi.org/10.2298/SOS1203271K . .

TY  - JOUR
AU  - Obradović, N.
AU  - Filipović, Suzana
AU  - Pavlović, Vladimir
AU  - Maricić, A.
AU  - Mitrović, N.
AU  - Balac, I.
AU  - Ristić, M.M.
PY  - 2011
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/2676
AB  - In this article the influence of mechanical activation on sintering process of magnesium-titanate and barium-zinc-titanate ceramics has been investigated. Both non-activated and mixtures treated in planetary ball mill for 80 minutes were sintered at 1100 degrees C and 1300 degrees C. The influence of mechanical activation on phase composition and crystal structure has been analyzed by XRD, while the effect of activation and sintering process on microstructure was investigated by scanning electron microscopy. It has been established that temperature of 1100 degrees C was to low to induce final sintering stage for both systems. Moreover, we concluded that barium-zinc-titanate ceramics exhibited better sinterability than magnesium-titanate ceramics.
PB  - Međunarodni Institut za nauku o sinterovanju, Beograd
T2  - Science of Sintering
T1  - Sintering of Mechanically Activated Magnesium-titanate and Barium-zinc-titanate Ceramics
EP  - 151
IS  - 2
SP  - 145
VL  - 43
DO  - 10.2298/SOS1102145O
ER  - 

@article{
author = "Obradović, N. and Filipović, Suzana and Pavlović, Vladimir and Maricić, A. and Mitrović, N. and Balac, I. and Ristić, M.M.",
year = "2011",
abstract = "In this article the influence of mechanical activation on sintering process of magnesium-titanate and barium-zinc-titanate ceramics has been investigated. Both non-activated and mixtures treated in planetary ball mill for 80 minutes were sintered at 1100 degrees C and 1300 degrees C. The influence of mechanical activation on phase composition and crystal structure has been analyzed by XRD, while the effect of activation and sintering process on microstructure was investigated by scanning electron microscopy. It has been established that temperature of 1100 degrees C was to low to induce final sintering stage for both systems. Moreover, we concluded that barium-zinc-titanate ceramics exhibited better sinterability than magnesium-titanate ceramics.",
publisher = "Međunarodni Institut za nauku o sinterovanju, Beograd",
journal = "Science of Sintering",
title = "Sintering of Mechanically Activated Magnesium-titanate and Barium-zinc-titanate Ceramics",
pages = "151-145",
number = "2",
volume = "43",
doi = "10.2298/SOS1102145O"
}

Obradović, N., Filipović, S., Pavlović, V., Maricić, A., Mitrović, N., Balac, I.,& Ristić, M.M.. (2011). Sintering of Mechanically Activated Magnesium-titanate and Barium-zinc-titanate Ceramics. in Science of Sintering
Međunarodni Institut za nauku o sinterovanju, Beograd., 43(2), 145-151.
https://doi.org/10.2298/SOS1102145O

Obradović N, Filipović S, Pavlović V, Maricić A, Mitrović N, Balac I, Ristić M. Sintering of Mechanically Activated Magnesium-titanate and Barium-zinc-titanate Ceramics. in Science of Sintering. 2011;43(2):145-151.
doi:10.2298/SOS1102145O .

Obradović, N., Filipović, Suzana, Pavlović, Vladimir, Maricić, A., Mitrović, N., Balac, I., Ristić, M.M., "Sintering of Mechanically Activated Magnesium-titanate and Barium-zinc-titanate Ceramics" in Science of Sintering, 43, no. 2 (2011):145-151,
https://doi.org/10.2298/SOS1102145O . .