Mössbauer Spectra of FeMo Alloys

Abstract

Mössbauer spectra of $\mathrm{Fe}\mathrm{Mo}$ alloys have been obtained for a series of closely spaced compositions from 2.1 to 6.0 at.% Mo. The hyperfine field and peak widths show a composition dependence suggestive of overlap of the disturbed surroundings of impurity atoms, in accord with results of neutron-diffraction studies of dilute impurities in iron. Analysis of the data in conjunction with the recent unpublished magnetization results of Aldred led to the deduction of a fractional increase in average iron magnetic moment, $\left(\frac{1}{{\mu }_{\mathrm{Fe}}}\right)\left(\frac{d{\mu }_{\mathrm{Fe}}}{\mathrm{dC}}\right)$, of 0.25 per at.% and a magnetic moment per Mo atom of 0.4${\mathrm{\mu }}_{\mathit{B}}$ directed antiparallel to the iron moment, the latter value in good agreement with the neutron-diffraction results.