A MOSSBAUER STUDY OF R(6)FE(13)X (R=PR, ND X=IN, SN, TL, PB, CU, AG, AU)

Compounds with the composition R(6)Fe(13)X (R = Pr, Nd; X = In, Sn, Tl , Ph, Cu, Ag, Au) were studied by Fe-57 Mossbauer spectroscopy. Attent ion was focused on the influence of the easy axis of the magnetization on the shape of the hyperfine patterns. The spectra are composed of a t least four subpatterns, originating from the different Fe lattice si tes. Contrary to the magnetization, a significant dependence of the hy perfine parameters on the specific elements R and X could not be detec ted. Predominantly, the easy axis of the magnetization was found to li e within the basal plane; only for R = Nd and X = In, Sn, Tl, Pb is an easy c-axis present. Since the low temperature magnetization data obt ained for the different compounds show a wide spread, while the Fe-57 hyperfine fields remain almost constant over the whole series, some ki nd of antiferromagnetic ordering within the Fe sublattice is anticipat ed.