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Platinum-Germanium Ordering in the Germanides REPtGe with the Heavy Rare Earth Elements

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Platinum-Germanium Ordering in the Germanides RE PtGe with the Heavy Rare Earth Elements

Ute Ch. Rodewald, Birgit Heying, Rolf-Dieter Hoffmann, Dirk Niepmann, and Rainer P¨ottgen

Institut f¨ur Anorganische und Analytische Chemie, Universit¨at M¨unster, Corrensstraße 30, D-48149 M¨unster, Germany

Reprint requests to R. P¨ottgen. E-mail: pottgen@uni-muenster.de Z. Naturforsch.2009,64b,383 – 387; received January 2, 2009

The equiatomic germanidesREPtGe with the heavy rare earth elements (RE) have been reinvesti- gated with respect to platinum-germanium ordering. The compounds were prepared by arc-melting of the elements followed by annealing for two weeks at 1070 K. TheREPtGe germanides crystal- lize with the TiNiSi-type structure, space groupPnma. The structures of ErPtGe (a= 692.01(5),b= 432.03(4),c= 753.19(5) pm,wR2 = 0.0523, 435F2, 20 variables) and the new germanide LuPtGe (a= 683.1(1),b= 429.2(1),c= 750.3(1) pm,wR2 = 0.0696, 358F2, 20 variables) have been refined from single crystal diffractometer data. These structures exhibit three-dimensional [PtGe] networks with strong Pt–Ge intra- (251 – 255 pm in LuPtGe) and weaker interlayer (272 pm in LuPtGe) inter- actions. The crystal chemical peculiarities of the wholeREPtGe series are briefly discussed.

Key words:Intermetallics, Rare Earth, Germanides

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