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X-ray powder diffraction study of cesium ammonium hexachlorotellurate [Cs0.86(NH4)0.14]2TeCl6

Published online by Cambridge University Press:  01 March 2012

R. Karray ,
A. Kabadou ,
A. Ben Salah  and
A. van der Lee
R. Karray
Affiliation:
Laboratoire des Sciences des Matériaux et d’Environnement, Faculté des Sciences de Sfax, 3018 Sfax, Tunisia
A. Kabadou
Affiliation:
Laboratoire des Sciences des Matériaux et d’Environnement, Faculté des Sciences de Sfax, 3018 Sfax, Tunisia
A. Ben Salah
Affiliation:
Laboratoire des Sciences des Matériaux et d’Environnement, Faculté des Sciences de Sfax, 3018 Sfax, Tunisia
A. van der Lee
Affiliation:
Institut Européen des Membranes (UMR 5635), Université de Montpellier II, cc 047, Place E. Montpellier, France
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Abstract

The crystal structure of cesium ammonium hexachlorotellurate [Cs0.86(NH4)0.14]2TeCl6, has been determined using X-ray powder diffraction techniques. At room temperature, the title compound crystallizes in the cubic space group Fm3m, with a lattice parameter a=10.470(17) Å. The Rietveld refinement of the structure led to final confidence factors Rp=0.0338 and Rwp=0.0487. The structure of [Cs0.86(NH4)0.14]2TeCl6 belongs to the large family of K2PtCl6-related structures. The H atoms of the ammonium group are orientated with its apex toward Te atoms as seen in the related compound (NH4)2SiF6. An IR spectroscopic study was performed to confirm the results of the diffraction method, notably concerning the presence of the ammonium group.

Keywords

Rietveld refinementX-ray powder diffractionthreefold disorderIR spectroscopy
Type
Technical Articles
Information
Powder Diffraction , Volume 21 , Issue 3 , September 2006 , pp. 225 - 228
Copyright
Copyright © Cambridge University Press 2006

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