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Darstellung und Kristallstrukturen von β-Rb2Te2 und Cs2Te2 sowie die Verfeinerung der Strukturen von Ca2P2 und Sr2As2

Published/Copyright: July 28, 2010

Abstract

Two alkali metal tellurides, which crystallize with a new type of structure, are described: Cs2Te2 type, space group Pbam, Rietveld refinement of powder data (Cs2Te2: a = 11.629(2) Å, b = 6.128(1) Å, c = 4.960(1) Å; β-Rb2Te2: a = 11.151(1) Å, b = 5.854(1) Å, c = 4.821(1) Å). This structure type may be described as a lower symmetric, distorted variant of the CsCl type. Furthermore we report the single crystal refinements of the structures of two alkaline earth pnicogenides M′2Y2(Ca2P2,Sr2As2) in order to get exact information about the bond lengths of the Y24−-dumbbells. Due to the Na2O2 type of both structures, two crystallographic independent sites exist for the pnicogen atoms. Interestingly, in both compounds two different bond lengths of the two independent dumbells Y24− are found (Ca2P2: P–P: 2.268(8) Å and 2.320(4) Å; Sr2As2: As–As: 2.521(9) Å and 2.574(5) Å).

Published Online: 2010-7-28
Published in Print: 1996-2-1

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