Journal
JOURNAL OF SOLID STATE CHEMISTRY
Volume 180, Issue 1, Pages 296-300Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2006.10.010
Keywords
nano-particles; saturation magnetization; coercivity; X-ray diffraction; Mossbauer spectra; cation distribution
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Cation distribution have been investigated using X-ray diffraction, magnetic and Mossbauer spectral studies in chromium-substituted nickel ferrites prepared by aerosol route. Cation distribution indicates that the chromium atom occupy octahedral site upto x = 0.8, and then also enters into tetrahedral site. The saturation magnetization decreases linearly with the increase of chromium concentration due to the diamagnetic nature of the Cr3+. However, interesting behaviour is observed in the coercivity. Initially it increases slowly with the chromium concentration but when x > 0.8 a very large increase has been observed. This was attributed to the specific cation distribution of Cr3+ which results an unquenched orbital angular momentum and a large anisotropy. Room temperature Mossbauer spectra of as obtained samples exhibited a broad doublet resolved into two doublets corresponding to the surface and internal region atoms. The samples annealed at 1200 degrees C show broad sextets, which were fitted with different sextets, indicating different local environment of both tetrahedral and octahedral coordinated iron cation. (c) 2006 Elsevier Inc. All rights reserved.
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