Hyperfine fields at57Fe in copper iron alloys

Abstract

The Mossbauer spectra of ⁵⁷Fe in copper iron alloys at 300 K and 1.4 K have been analyzed to show that the hyperfine field at an isolated iron nucleus is 80 ± 3 kOe, and that clustering of iron atoms occurs even in quite dilute, metallurgically single phase alloys. These results are important for the interpretation of bulk properties at low concentrations. The iron atomic screening is modified by the presence of an iron neighbour, as shown by changes in both the hyperfine field and the isomer shift, and by the appearance of an electric field gradient at the iron nucleus