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Octahedral sites; tetrahedral sites; quadrupole doublet; site preference energy; oxygen deviation parameter

A Mössbauer study of cation distribution in systems Co_x Mn_3−x−yFe_yO₄ and Ni_x Mn_3−x−y Fe_yO₄ has been made. It has been found that in both systems all specimens withy<0.6 value exhibit quadrupole doublets corresponding to site symmetries Fe³⁺(I) and Fe³⁺(II) of octahedral site. As more and more cobalt or nickel is introduced into the matrix the intensity of the inner quadrupole doublet increases while on introducing iron that of the outer quadrupole doublet increases. After a certain concentration of iron the inner doublet starts becoming more intense. It is suggested that this arises possibly from the substitution of cations in the second co-ordination sphere of Fe³⁺(I) and Fe³⁺(II) sites. Fory>0.6 the Mössbauer spectra show relaxation effects.

V K Singh^{1 2} S Lokanathan¹

1. Department of Physics, University of Rajasthan, Jaipur - 302 004, India
2. SGRR(PG) College, Dehradun - 248 001

Published

January 1983

Manuscript received

15 July 1982

Manuscript revised

3 December 1982