Cation distribution and magnetic properties in chromium-substituted nickel ferrites prepared using aerosol route
- Department of Chemistry, Panjab University, Chandigarh 160 014 (India)
- Institute Instrumentation Centre, Indian Institute of Technology-Roorkee, Roorkee 247 667 (India)
Cation distribution have been investigated using X-ray diffraction, magnetic and Moessbauer 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 Cr{sup 3+}. 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 Cr{sup 3+} which results an unquenched orbital angular momentum and a large anisotropy. Room temperature Moessbauer 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 deg. C show broad sextets, which were fitted with different sextets, indicating different local environment of both tetrahedral and octahedral coordinated iron cation. - Graphical abstract: Hysterisis loop of chromium-substituted nickel ferrites after annealing at 1200 deg. C.
- OSTI ID:
- 21015650
- Journal Information:
- Journal of Solid State Chemistry, Vol. 180, Issue 1; Other Information: DOI: 10.1016/j.jssc.2006.10.010; PII: S0022-4596(06)00545-7; Copyright (c) 2006 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
AEROSOLS
ANNEALING
CATIONS
CHROMIUM COMPOUNDS
CHROMIUM IONS
COERCIVE FORCE
DISTRIBUTION
FERRITES
MAGNETIC PROPERTIES
MAGNETIZATION
MOESSBAUER EFFECT
NICKEL COMPOUNDS
ORBITAL ANGULAR MOMENTUM
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 1000-4000 K
X-RAY DIFFRACTION