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Zeitschrift für Naturforschung B

A Journal of Chemical Sciences

12 Issues per year


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1865-7117
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Volume 53, Issue 12 (Dec 1998)

Issues

BaCu6Ge2S8 -Ein Thiogermanat als Variante der Li3Bi-Struktur / BaCu6Ge2S8 -A Thiogermanate as a Variant of the Li3Bi Structure

Markus Tampier
  • Institut für Anorganische Chemie und Strukturchemie II der Heinrich-Heine-Universität, Universitätsstrasse 1, D-40225 Düsseldorf, Germany
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Dirk Johrendt
  • Institut für Anorganische Chemie und Strukturchemie II der Heinrich-Heine-Universität, Universitätsstrasse 1, D-40225 Düsseldorf, Germany
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
Published Online: 2014-06-02 | DOI: https://doi.org/10.1515/znb-1998-1210

Abstract

BaCu6Ge2 S8 was synthesized by direct reaction of the elements at 750°C and characterized by X-ray single crystal techniques. The thiogermanate crystallizes in a new orthorhombic structure type (a = 6.122(1) Å, b = 12.084(3) Å, c = 17.614(5) Å; Pbcm, Z = 4). Isolated [GeS4]4- tetrahedra form a slightly distorted cubic face-centered (fee) arrangement. Baand Cu-atoms each occupy half the octahedral gaps (OG) of this “tetrahedra packing” . Further Cu atoms fill the tetrahedral gaps ( TG) completely. The compound can be written as Ba2(1/2OG)(Cu2)2(1/2OG)Cu8(TG)(GeS4)4 . Thus the structure of BaCu6Ge2S8 can be derived from the Li3Bi type. The sulfur coordination of the metal atoms (Cu tetrahedral or trigonal, Ba with CN 8) are realized by the spatial orientation of the [GeS4]4- tetrahedra. Their centers nearly maintain the fcc-arrangement. This structure interpretation of BaCu6 Ge2S8 from the viewpoint of a “filled tetrahedra packing” is discussed for further known thiogermanate compounds.

Keywords: Chalcogenides; Germanium; Copper; Preparation; Crystal Structure

About the article

Received: 1998-07-09

Published Online: 2014-06-02

Published in Print: 1998-12-01


Citation Information: Zeitschrift für Naturforschung B, ISSN (Online) 1865-7117, ISSN (Print) 0932-0776, DOI: https://doi.org/10.1515/znb-1998-1210.

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[1]
Markus Tampier and Dirk Johrendt
ChemInform, 2010, Volume 30, Number 14, Page no
[2]
Yanjie Cui, Oottil Mayasree, Abdeljalil Assoud, and Holger Kleinke
Journal of Alloys and Compounds, 2010, Volume 493, Number 1-2, Page 70

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