Abstract

Mossbauer measurements have been made at 57Fe nuclei for 0.1, 0.2, 0.5, 1.0, and 1.5 mil foils of an alloy of 1.0 at.% Ga in iron and for powdered alloys of 1.8, 4.7, and 7.8 at.% Ga in iron. It is found that the distribution of hyperfine fields cannot be fitted to a model of a random solid solution for foil thicknesses greater than 0.2 mils due to the effects of absorber thickness. For a two shell model the analysis of the data for the foils indicates that the hyperfine field Ho at iron atoms with no solute atoms in the first or second coordination shells is sensitive to the degree of broadening and, further, is a complicated function of thickness. Neither the shift So nor incremental changes in hyperfine field ΔHi due to spin perturbations by solute atoms in neighbor shells, is as sensitive to line broadening. Using the results for foils, an empirical correction for thickness is applied to the results for the powdered alloys. The slope of the fractional change in hyperfine field and fractional change in atomic moment with solute concentration agree at low concentrations but differ at higher concentrations.

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