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Your search keyword '"Nikolić, A.S."' showing total 14 results
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14 results on '"Nikolić, A.S."'

1. Structure and properties of nanocrystalline tetragonal BaTiO3 prepared by combustion solid state synthesis

Author

Filipović S., Anđelković Lj., Jeremić D., Vulić P., Nikolić A.S., Marković S., Paunović V., Lević S., and Pavlović V.B.

Subjects
nanocrystaline batio3, combustion synthesis, xrd, raman spectroscopy, dielectric properties, Chemical technology, TP1-1185
Abstract

Barium titanate (BaTiO3) attracts high scientific and technological attention due to good dielectric and electromechanical properties. Although BaTiO3 is one of the most frequently investigated ferroelectric materials, the need for finding new and/or improved synthesis methods of this material still exists. In this paper, a novel, mild synthesis route for producing tetragonal BaTiO3 from barium nitrate and Ti-oxalate precursor is presented. Morphology of the prepared and subsequently sintered BaTiO3 was determined by SEM. Particle size distribution of the as prepared powder was monitored by the laser diffraction. The phase composition, structure and lattice dynamics were investigated by XRD and Raman spectroscopy. Finally, dielectric parameters were determined in the temperature range from 30 to 180ºC, and within a variety of frequencies. Curie temperature was detected at 130ºC.

Published
2020
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4. Structure and Properties of Nanocrystalline Tetragonal BaTiO3 Prepared by Combustion Solid State Synthesis

Author

Filipović, Suzana, Filipović, Suzana, Andjelković, Lj., Jeremić, D., Vulić, Predrag J., Nikolić, A.S., Marković, S., Paunović, V, Lević, Steva, Pavlović, Vladimir, Filipović, Suzana, Filipović, Suzana, Andjelković, Lj., Jeremić, D., Vulić, Predrag J., Nikolić, A.S., Marković, S., Paunović, V, Lević, Steva, and Pavlović, Vladimir

Abstract

Barium titanate (BaTiO3) attracts high scientific and technological attention due to good dielectric and electromechanical properties. Although BaTiO3 is one of the most frequently investigated ferroelectric materials, the need for finding new and/or improved synthesis methods of this material still exists. In this paper, a novel, mild synthesis route for producing tetragonal BaTiO3 from barium nitrate and Ti-oxalate precursor is presented. Morphology of the prepared and subsequently sintered BaTiO3 was determined by SEM. Particle size distribution of the as prepared powder was monitored by the laser diffraction. The phase composition, structure and lattice dynamics were investigated by XRD and Raman spectroscopy. Finally, dielectric parameters were determined in the temperature range from 30 to 180 degrees C, and within a variety of frequencies. Curie temperature was detected at 130 degrees C.

Published
2020

14. Synthesis and Characterization of Al, Y, Co and Cr Substituted Ultrafine Powder of NiFe2O4

Author

Blanuša, Jovan, Antić, B., Nikolić, A.S., Rakić, S., Jovic, N., and Srećković, Milesa

Abstract

The ultrafine spinel NiFe1.9M0.1O4 powders (M=Al, Y, Cr, Fe) were synthesized by thermal decomposition of appropriate mixtures of complex compounds with acetylacetone - (2,4 pentadione) ligands ([M(AA)x]) at 500 °C. Samples were annealed in the temperature range 600-1000 °C and the crystallization process was followed by XRD. The largest crystallite size and the highest crystallization rate are observed for NiFe1.9Al0.1O4, while the opposite was found for NiFe1.9Y0.1O4. Strain value in NiFe1.9Y0.1O4 changes sign at temperatures between 700-800 °C, while for NiFe1.9M0.1O4 (M=Al, Cr) it has a positive sign and reaches the maximum value at 700 °C. The crystal structure of the samples annealed at 1000 °C was refined using the Rietveld profile method. Cation substitution in Ni-ferrite changes its structural and microstructural parameters, and can also significantly influence other physical properties.

Published
2004
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