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The low-temperature form of calcium gold stannide, CaAuSn

TitleThe low-temperature form of calcium gold stannide, CaAuSn
Publication TypeJournal Article
Year of Publication2014
AuthorsLin, QS, Corbett, JD
JournalActa Crystallographica Section C-Structural Chemistry
Date Published08
Type of ArticleArticle
ISBN Number0108-2701
Accession NumberWOS:000340413600009
Keywordsapproximants, calcium gold stannide, Crystal structure, EuAuGe-type, icosahedral quasi-crystal, intergrowth structure, khg2 type, low-temperature study, phases, single-crystal X-ray diffraction, system

The EuAuGe-type CaAuSn phase has been synthesized and single-crystal X-ray diffraction analysis reveals that it has an orthorhombic symmetry (space group Imm2), with a = 4.5261 (7) angstrom, b = 7.1356 (11) angstrom and c = 7.8147 (11) angstrom. The structure features puckered layers that are connected by homoatomic Au-Au and Sn-Sn interlayer bonds. This structure is one of the two parent structures of its high-temperature polymorph (ca 873 K), which is an intergrowth structure of the EuAuGe-and SrMgSi-type structures in a 2:3 ratio.

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