Structural investigation of GeSb6Te10 and GeBi6Te10 intermetallic compounds in the chalcogenide homologous series

Acta Crystallographica. Section B, Structural Science
Toshiyuki MatsunagaMasaki Takata

Abstract

The crystal structures of GeSb(6)Te(10) and GeBi(6)Te(10) were scrutinized using an X-ray powder diffraction method, which revealed that these compounds crystallize in trigonally distorted cubic close-packed structures with a 51-layer period (R3m). Each layer consists of a triangular atomic net; Te atoms occupy their own specific layers, whereas Ge, Sb and Bi atoms are located in the other layers. In these pseudobinary compounds, random atomic occupations of Ge and Sb/Bi are observed and the layers form two kinds of elemental structural blocks by their successive stacking along the c axis. These compounds can be presumed to be isostructural. It is known that the chemical formula of the chalcogenide compounds with the homologous structures found in these pseudobinary systems can be written as (GeTe)(n)(Sb(2)Te(3))(m) or (GeTe)(n)(Bi(2)Te(3))(m) (n, m: integer); the GeSb(6)Te(10) and GeBi(6)Te(10) investigated in this study, which correspond to the case in which n = 1 and m = 3, naturally have 3 x l = 51-layer structures according to a formation rule l = 2n + 5m commonly found in the compounds of these chalcogenide systems (l represents the number of layers in the basic structural unit). Calculations based on the density function...Continue Reading

References

Nov 10, 2004·Acta Crystallographica. Section B, Structural Science·Toshiyuki MatsunagaYoshiki Kubota
May 18, 2007·Acta Crystallographica. Section B, Structural Science·Toshiyuki MatsunagaMasaki Takata

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Citations

Sep 4, 2015·Scientific Reports·Wei ZhangRiccardo Mazzarello
Sep 21, 2011·Acta Crystallographica. Section B, Structural Science·Kouichi KifuneToshiyuki Matsunaga
Nov 21, 2012·Acta Crystallographica. Section B, Structural Science·Toshiyuki MatsunagaKouichi Kifune
Feb 13, 2020·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Gang HanFeng Ye

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