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Applicant:
Indian Institute of Technology (IIT) Patna 
Author:
L. Kumar, P. Kumar,V. Kuncser,S. Greculeasa, B.Sahoo and M. Kar 
Corresponding Authors:
Manoranjan Kar 
DOI #:
https://doi.org/10.1016/j.matchemphys.2018.02.008 
Title:
Strain induced magnetism and superexchange interaction in Cr substituted nanocrystalline cobalt ferrite 
Journal:
Materials Chemistry and Physics 
Year:
2018 
Volume:
211 
Page:
54 
Keywords:
Powder diffraction, Rietveld analysis, Magnetic properties, Mössbauer spectroscopy 
Abstract:
Distribution of magnetic relaxation time using Mossbauer spectroscopy has been observed for CoFe 2- xCrxO4 (0.1 x 0.4) annealed at lower temperature (400 C). The estimated cation distribution over A and B sites observed by Mossbauer spectroscopy is consistent with that obtained by the Rietveld € analysis of the X-ray diffraction patterns. Saturation magnetization and magnetocrystalline anisotropy constant increase up to 20% of Cr (x ¼ 0.2) substitution and, decrease with further increase of x. However, the coercive field as well as the Neel temperature decreases with increase in Cr 3þ concentration, i.e., a crossover from the hard magnetic to soft magnetic nature by Cr substitution at the Fe site of CoFe2O4 has been observed. This behavior is attributed to the competition between strain induced magnetism and superexchange interaction between cations 
Entered by:
Venkata Dantham on 2020-08-02 
 
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