STRUCTURE REFINEMENTS FOR SOME PLATINUM METAL MONOSILICIDES

The crystal structures of platinum metal monosilicides were refined from powder diffraction data using the Rietveld method. The compounds studied were the FeSi-type structure RuSi, OsSi and RhSi, and the MnP-type structure RhSi, IrSi, PdSi and PtSi. The structure of the monoclinic form of RhSi, space group P2(1)/c, was also refined. The only CsCl-type structure observed was that of RuSi, which was obtained together with the FeSi-type polymorph. Atomic coordinates refined for PdSi, PtSi and FeSi-type RhSi are in good agreement with existing single-crystal data.