Magnetic Moments and Hyperfine Parameters of Fe3-xCrxAl0.5Si0.5

Results of X-ray, neutron, magnetization and Mössbauer measurements on polycrystalline samples of Fe 3- x Cr x Al 0.5 Si 0.5 ( x =0, 0.125, 0.250, 0.375, and 0.5) alloys, crystallizing in DO 3 type of structure, are presented. X-ray and neutron diffraction confirmed the phase homogeneity of all the samples. The unit cell volume has been proved to be independent of the chromium content. Neutron and Mössbauer measurements disclosed that Cr atoms occupy preferentially B-sites, while D-sites are almost entirely occupied by Al and Si. The total magnetisation as well as the individual magnetic moments µ Fe(AC) , µ Fe(B) and µ Cr(BD) have been found to vary linearly with chromium concentration. Influence of local environments on the formation of magnetic moments in Fe 3 Al 0.5 Si 0.5 when chromium is substituted for iron was examined using self-consistent spin-polarized tight-binding linear muffin-tin orbital method (TB-LMTO).