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Ferrites; Mössbauer spectra; octahedral sites; tetrahedral sites; superexchange interaction; hyperfine field; isomer shift; quadrupole splitting; site preference energy

Mössbauer spectra of Co_xMn_1−xFe₂O₄ and Ni_xMn_1−xFe₂O₄ ferrites withx values ranging from 0·1 to 0·8 in steps of 0·1 have been recorded at room temperature. All spectra exhibit well-defined Zeeman hyperfine patterns. It has been observed that hyperfine field at Fe³⁺ nucleus increases more rapidly by nickel substitution than by cobalt substitution. This has been explained in terms of exchange interactions and cation distribution in the spinels. Hyperfine fields, isomer shifts and quadrupole splittings have been determined.

V K Singh^{1 2} N K Khatri¹ S Lokanathan¹

1. Department of Physics, University of Rajasthan, Jaipur - 302 004, India
2. SGRR (PG) College, Dehra Dun

Published

April 1981