Abstract
The structure and magnetic properties of ball-milled and subsequently annealed Sm 2Fe 17– x M x compounds (M = Si, Ga, Co, Cr, Zr, Mo, for x = 2) were investigated by X-ray diffraction coupled with magnetic measurements and Mössbauer spectroscopy. Rietveld analysis have shown that all these samples crystallize in the Th 2Zn 17 type rhombohedral structure. The substituting elements Si, Ga, Co occupy the 18 h atom site, while Cr, Zr, Mo prefer the 6 c site. Mössbauer studies corroborate these results. The X-ray analysis cannot solve the possible M atom distribution over Fe atom sites when atomic factors of Fe and M are close. Mössbauer spectroscopy appears as the efficient tool to raise this ambiguity. The Curie temperature increases upon Zr and Cr substitution reaching a maximum for x = 1, then decreases because of magnetic dilution.
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