Abstract
Crystal structures of rare-earth iron compounds, Sm 2(Fe 1− x Al x ) 17 with x=0.058 and 0.081, were successfully determined assuming the space group R̄3m (No.166) by means of single crystal X-ray diffraction at room temperature. In these compounds, aluminum atoms partly substitute for iron atoms, Fe(4), at the 18h ( x,− x, z) site. In Sm 2(Fe 0.919Al 0.081) 17, a small amount of aluminum substitution is noticed for iron atoms at the 18f ( x,0,0) site. Unit cell volume expansion due to the substitution causes appreciable increase in Sm–Fe(4), Fe(3)–Fe(4) and Fe(4)–Fe(4) interatomic distances. A local atomic group consisting of only Fe atoms at the 6c site (dumbbell) and the 18f site (ring) keeps its shape against the aluminum substitution.
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