Mössbauer study of Fe57 and Co57 in Co1 + xV2-xO4
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
Journal of Physics and Chemistry of Solids
Lee, Jong Duk; Schroeer, Dietrich; and Spencer, Charles D., "Mössbauer study of Fe57 and Co57 in Co1 + xV2-xO4" (1976). Faculty Articles Indexed in Scopus. 2700.