Title

Mössbauer study of several cobalt spinels using Co57 and Fe57

Document Type

Article

Publication Date

1-1-1974

Abstract

The Mössbauer spectra produced by 10-4-at.% Co57 and 0.5-at.% Fe57 doped in the normal spinels Co3O4, CoRh2O4, CoCr2O4, CoMn2O4, and ZnCo2O4 have been obtained. Based on properties of the spinel structure and on correlations with Mössbauer data from the natural-iron spinels, these spectra are interpreted in terms of the daughter and impurity iron being located on the tetrahedral and octahedral lattice sites. The charge state of the daughter iron is not always the same as that of the parent cobalt; instead, it is generally that of natural iron in the parallel spinel compounds Fe3O4, CoFe2O4, FeCo2O4, FeCr2O4, FeMn2O4, and ZnFe2O4. From this and other evidence, we propose that the daughter-iron's valence is determined primarily by the chemical bonding properties of iron (as distinct from cobalt) in the environment where it is created. Of the several models of spinel crystal chemistry, that of Goodenough and Loeb roughly accounts for our conclusions. © 1974 The American Physical Society.

Publication Name

Physical Review B

Volume Number

9

First Page

3658

Last Page

3665

Issue Number

9

DOI

10.1103/PhysRevB.9.3658

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