Study of Disordered Fe_2Cr_(1-x)Mn_xAl Alloys

摘要

A series of ferromagnetic alloys Fe_2Cr_((1-x))Mn_xAl were prepared by arc melting for x = 0 to 0.05. The alloys are single phased, but disordered with B2 type structure. Variation of the lattice parameter with concentration of Mn is smooth with a maximum occurring at x = 0.02. Highest Curie temperature (T_C) corresponds to sample with x = 0.02. Moessbauer spectra for these alloys show the presence of a paramagnetic peak along with the magnetic hyperfine field. This coexistence can be explained by clustering of Mn atoms. The hyperfine field distribution shows the presence of a single, broad component of field. The variation of this component as well as saturation magnetization follows the variation in the lattice parameter with concentration of Mn. Moessbauer and X-ray studies point to the disorder present in these alloys.