Abstract
AbstractThe out‐of‐equilibrium hexagonal P6/mmm R1–s(Fe, M)5+2s (R = Sm, Pr and M = Co, Si or Ga) intermetallics are obtained by controlled nanocrystallization. A model is presented to explain the structure of the hexagonal phases, which stoichiometry is consistent with Sm(Fe, M)9 and R(Fe, Ti, Co)10. The Curie temperatures increase versus Ga, Si, Co content. The analysis of the Mössbauer spectra leads to monotonous variation of the hyperfine parameters. The refinement of the Mössbauer spectra was performed on the basis of the correlation between Wigner–Seitz cell volumes obtained from X‐ray diffraction results and isomer shifts. The abundance of each magnetic site was calculated by the multinomial distribution law. For a given substituting Co, Si, Ga content, the sequence for the isomer shift in the hexagonal cell is 2e > 3g > 6l. With increasing M content, the isomer shift of the 3g site remains quasi‐constant. Those approaches lead to the location of Si, Ga, Co in 3g site, Ti in 6l site. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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