EFFECT OF SUBSTITUTIONS ON 3D MAGNETISM IN CD(2)FE(14-X)M(X)C COMPOUNDS, WITH M=NI,SI,CU OR V

Results of magnetic measurements and Fe-57 Mossbauer spectroscopy perf ormed on Gd(2)Fe(14-x)M(x)C compounds, with M = Ni, Si, Cu or V are pr esented. As M is substituted for Fe the six crystallographically inequ ivalent iron sites split into seven inequivalent sites for M = Si, Cu, V, or eight for M = Ni. The analysis of the hyperfine fields and rela tive intensities supports a preferential distribution of the substitut ional elements on the Fe lattice sites. The effects of the substitutio nal elements on Curie temperatures and anisotropy fields as well as on Fe hyperfine parameters are discussed on the grounds of the preferent ial Fe site occupancy.