Abstract

Structure and magnetic properties of nanocrystalline P6/mmm Sm(Fe,M)17C(M=Ga,Si) are presented. Their structure is explained with a model ground on the Sm1-s(Fe,M)5+2s formula (s = vacancy rate) where s Sm atoms are statistically substituted by s transition metal pairs. The interpretation of the Mssbauer spectra is based on the correlation between the isomer shift (δ) and the Wigner-Seitz Cell volumes, calculated from the structural parameters. The δ behaviour of each crystallographic site versus Ga/Si content, defines the Ga/Si. The maximum coercivity is obtained for low Ga/Si content for auto-coherent diffraction domain size ≃ 30 nm. This controlled microstructure might lead to hard permanent magnet materials.

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