Abstract
The effect of the substitution of paramagnetic trivalent chromium ions in stoichiometric magnesium–manganese ferrites has been studied with the composition Mg 0.9 Mn 0.1 Cr y Fe 2-y O 4 where y varies from 0.0, 0.1 to 0.9 in steps of 0.2. The single-phase cubic spinel structure of these samples has been confirmed from X-ray diffraction analyses. Mössbauer spectra of these samples studied at room temperature (300 K) showed two characteristic ferrimagnetic Zeeman sextets for lower concentration of Cr 3+ followed by relaxation phenomenon corresponding to y=0.9. The dependence of Mössbauer parameters, viz. isomer shift, quadrupole splitting, line width and hyperfine magnetic field on Cr 3+ concentration have been discussed. The variation of hyperfine magnetic field with increasing Cr 3+ content has been explained on the basis of Neel's molecular field model.
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