The stannides AuNiSn2 and AuCuSn2 - Bulk synthesis and superstructure determination

Stefan Lange, Tom Nilges, Rolf Dieter Hoffmann, Rainer Pöttgen

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

The stannides AuNiSn2 and AuCuSn2 were prepared by melting of the elements in silica ampoules at 1300 K followed by slow cooling to room temperature. The structures of both compounds were refined on the basis of single crystal X-ray data: P3̄m1, a = 412.41(14), c = 529.24(11) pm, wR2 = 0.0268, 159 F2 values, 10 variables for AuNiSn2 and a = 425.97(17), c = 526.88(15) pm, wR2 = 0.0507, 159 F2 values, 11 variables for AuCuSn2 (twinned crystal, BASF = 0.305(4)). These stannides crystallize with a superstructure of the NiAs type with a complete ordering of the transition metal atoms. They derive from a AuSn subcell structure, where every other layer of octahedral voids in the hexagonal closest packing of the tin atoms is filled by nickel in AuNiSn2 and by copper in AuCuSn2. Due to the symmetry reduction smaller NiSn6/6 (CuSn6/6) and larger AuSn6/6 octahedra alternate along the c axis. The crystal chemistry is discussed on the basis of a group-subgroup scheme.

Original languageEnglish
Pages (from-to)1163-1166
Number of pages4
JournalZeitschrift fur Anorganische und Allgemeine Chemie
Volume632
Issue number7
DOIs
StatePublished - 2006
Externally publishedYes

Keywords

  • Group-subgroup-scheme
  • Stannides
  • Superstructure

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