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Type: Artigo de periódico
Title: K2scsn(aso4)3: An Arsenate-containing Langbeinite.
Author: Harrison, William T A
Abstract: The title compound, dipotassium tri-mu-arsenato-scandium(III)tin(IV), is the first arsenate-containing langbeinite to be characterized by single-crystal methods and crystallizes in the aristotype P2(1)3 cubic symmetry for this structure type in which the K(+) ions and the octahedral scandium and tin cations lie on crystallographic threefold axes. The Sc(III) and Sn(IV) ions show a slight segregation over the two octahedral sites, with Sc/Sn populations of 0.582 (5):0.418 (5) on one site and 0.418 (5):0.582 (5) on the other. Bond-valence-sum calculations indicate that the K(+) ions are significantly underbonded in this structure and the O atoms show large anisotropic displacement parameters, as also seen in other langbeinites. The crystal studied was found to be a merohedral twin with a 0.690 (16):0.310 (16) domain ratio.
Citation: Acta Crystallographica. Section C, Crystal Structure Communications. v. 66, n. Pt 7, p. i82-4, 2010-Jul.
Rights: aberto
Identifier DOI: 10.1107/S0108270110021670
Date Issue: 2010
Appears in Collections:Unicamp - Artigos e Outros Documentos

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