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We have studied nanocrystalline metastable P6/mmm Sm͑Fe,Si͒ 9 by means of x-ray diffraction, Mössbauer spectroscopy coupled with Curie temperature and magnetization measurements. The structural transformation towards equilibrium R3 m Sm 2 (Fe,Si) 17 is studied by Rietveld analysis. A decreasing unit cell volume for substituting Fe by Si was found. The Curie temperature increases with Si content with a slight improvement of the magnetic moment per iron atom compared to the equilibrium Sm 2 (Fe,Si) 17 alloys. A specific program for the Wigner-Seitz cell calculation of the metastable disordered structure was used. The hyperfine parameter sets were assigned according to the relationship between the Wigner-Seitz cell volume of each iron site and their isomer shift. It results that Si preferentially occupies the 3g site with the recurrent sequence H HF (2e) ϾH HF (6l)ϾH HF (3g). The mean hyperfine field decreases with silicon content.
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