ChemInform Abstract: Refinement of the Crystal Structure π‐Al₉FeMg₃Si₅.

Abstract

structure structure (solids and liquids) D 2000 -010Refinement of the Crystal Structure π-Al 9 FeMg 3 Si 5 .-A reinvestigation of the crystal structure of the quaternary so-called π-phase using modern single crystal automatic four circle counter technique indicates that the π-phase crystallizes in a unique structure type with the noncentrosymmetric hexagonal space group Pr6r2m (Z = 1). Whereas previous structure studies claim full atom order, the present refinement clearly indicates a partial ordering of the crystal structure with a random distribution of 0.94 Al + 0.06 Mg in the 6i-sites. The chemical formula as a result of the refinement Al 8.7 FeMg 3.3 Si 5 is in close agreement with the experimental composition Al 9 FeMg 3.5 Si 5 . -(KRENDELSBERGER, R.; ROGL, P.; LEITHE-JASPER, A.; SIMENSEN, C.