Study of order–disorder transformation in Fe–Al–Si alloys by mössbauer spectroscopy

Abstract

The ordered and disordered ferromagentic and paramanetic alloys Fe3‐x(Al, Si)1+ x are in vestigated using the Mössbauer spectroscopy of 57Fe. The measurements are performed in transmission and scattering geometries at 300 and 4.2 K. Some of the spectra are taken also in an applied mangetic field. In the alloying range of 25 to 32 at% the excess diamagnetic atoms (Al and Si) prefearably occupy the A‐sublattice rather than the D‐sublattice in the DO3 type structure. This is contrary to the atomic distribution given by X‐ray analysis. The information concering the magnetic behaviour of this type of materials can only be obtained when the non‐destructive scattering geometry is used.