Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 649, Issue -, Pages 1231-1238Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2015.07.238
Keywords
Ferrites; Nanopowder; X-ray analysis; Structure; Microstructure; Cation distribution; Raman spectroscopy; Magnetic properties
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Funding
- Serbian Ministry of Education and Science [III45021]
- COST IC1208 Project
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Nickel ferrite nanopowder was synthesized using a co-precipitation method, and further annealed at three different temperatures of 500 degrees C, 750 degrees C and 900 degrees C. The effect of annealing process was explored on particle size, cation distribution and magnetic properties of NiFe2O4. The prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Raman spectroscopy and with the use of a vibrating sample magnetometer. The X-ray diffraction patterns at different annealing temperatures demonstrated the existence of only spinel phase of NiFe2O4. The results of Rietveld analysis showed that the sample annealed at 750 degrees C possesses inverse spinel structure, while the others have partially inverted spinel structure. The SEM analysis indicated a change of particle size and morphology at higher annealing temperature. The change in Raman modes was observed with the change of particle size and cation distribution. The highest value of the saturation magnetization (38 emu g(-1)) was obtained at annealing temperatures of 900 degrees C. (C) 2015 Elsevier B.V. All rights reserved.
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