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Issue 4, 2010
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A synchrotron powder X-ray diffraction study of the skutterudite-related phases AB1.5Te1.5 (A = Co, Rh, Ir; B = Ge, Sn)

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Abstract

X-Ray resonant scattering has been exploited to investigate the crystal structure of the AB1.5Te1.5 phases (A = Co, Rh, Ir; B = Ge, Sn). Analysis of the diffraction data reveals that CoGe1.5Te1.5 and ASn1.5Te1.5 adopt a rhombohedral skutterudite-related structure, containing diamond-shape B2Te2 rings, in which the B and Te atoms are ordered and trans to each other. Anion ordering is however incomplete, and with increasing the size of both cations and anions, the degree of anion ordering decreases. By contrast, the diffraction data of IrGe1.5Te1.5 are consistent with an almost statistical distribution of the anions over the available sites, although some ordered domains may be present. The thermoelectric properties of these materials are discussed in light of these results.

Graphical abstract: A synchrotron powder X-ray diffraction study of the skutterudite-related phases AB1.5Te1.5 (A = Co, Rh, Ir; B = Ge, Sn)

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Publication details

The article was received on 08 Jul 2009, accepted on 28 Aug 2009 and first published on 14 Sep 2009


Article type: Paper
DOI: 10.1039/B913578B
Citation: Dalton Trans., 2010,39, 1020-1026
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    A synchrotron powder X-ray diffraction study of the skutterudite-related phases AB1.5Te1.5 (A = Co, Rh, Ir; B = Ge, Sn)

    P. Vaqueiro, G. G. Sobany and A. V. Powell, Dalton Trans., 2010, 39, 1020
    DOI: 10.1039/B913578B

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