LOCAL ENVIRONMENTS EFFECTS AND SITE PREFERENCE IN FE3-XCRXAL ALLOYS

The properties of Fe3-xCrxAl alloys for x less than or equal to 0.5 wi th DO3-type of ordering have been investigated at room temperature by Mossbauer spectroscopy in zero field and in external magnetic field of about 4.3 kOe applied along the beam direction. The results show that the mean hyperfine magnetic field (h.m.f.) decreases nonlinearly with Cr concentration and is linearly correlated with the average atomic m agnetic moments of the samples. The postulated quadratic dependence of h.m.f. on the number of nearest neighbour (n.n.) iron atoms allows un ambiguous identification of the components of the measured spectra. Th e analysis of relative intensities of every component leads to the con clusion that Cr preferentially occupies B-sites. The values of iron ma gnetic moment as a function of n.n, configuration are estimated for bo th (A,C) and B sites.