Mössbauer study of magnetic properties formation in disordered Fe-Al alloys

For by mechanical treatment disordered Fe-Al alloys in the concentration range of Al from 0 to 60 at% the average hyperfine field, H , and isomer shift, η , values, the magnetic ordering temperatures T c and the average magnetic moment m per Fe atom were measured in Mössbauer and magnetometric studies. An explanation for the features of the concentration dependence H ( x) is proposed in terms of the local hyperfine field H K dependence obtained experimentally, and the local atomic environments probabilities. Proceeding from the data concerning the behaviour of the average and local hyperfine fields and the local atomic configurations, a model for the local magnetic moments m K on the Fe atom, which describes the form of the average magnetic moment m as a function of Al content, was constructed.