Title

Mössbauer study of Fe57 and Co57 in Co1 + xV2-xO4

Document Type

Article

Publication Date

1-1-1976

Abstract

Mössbauer sources and absorbers, prepared by doping Fe and radioactive Co into samples of Co V O (0 ≤ x ≤ 1), were studied in the temperature range of 80-500 K. The source and absorber spectra are very similar. The absence of any Fe at the A site can be understood by partial covalent bond formation with an anion. However, the predominance of Fe at the B site (with some Fe for x = 1) cannot be explained by simple crystal-field or molecular-orbital theories. The x dependence of the isomer shift and of the Fe B-site quadrupole interaction can be related to changes in the lattice constant and the oxygen parameter. The temperature dependence of the Fe B-site quadrupole interaction can be fitted in the motional-averaging model. In the range of 0 ≤ x ≤ 0.5 the temperature dependence of the isomer shift shows effects of chemical bonding beyond the second-order Doppler shift. © 1976. 57 57 2+ 3+ 2+ 3+ 2+ 1-x 2-x 4

Publication Name

Journal of Physics and Chemistry of Solids

Volume Number

37

First Page

747

Last Page

752

Issue Number

8

DOI

10.1016/0022-3697(76)90042-1

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