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A powder diffraction study of MIBaIn2(PO4)3 (MI=Na, K, Cs) with a langbeinite-type structure

Published online by Cambridge University Press:  05 March 2012

D. Louër ,
V. Moise ,
M. Liégeois-Duyckaerts  and
A. Rulmont
D. Louër
Affiliation:
Laboratoire de Chimie du Solide et Inorganique Moléculaire (UMR 6511), Institut de Chimie, Université de Rennes, Avenue du Général Leclerc, 35042 Rennes cedex, France
V. Moise
Affiliation:
Laboratoire de Chimie Inorganique Structurale, Département de Chimie Générale, Université de Liège, 3 Allée de la Chimie, B6, Sart-Tilman, 4000 Liège, Belgium
M. Liégeois-Duyckaerts
Affiliation:
Laboratoire de Chimie Inorganique Structurale, Département de Chimie Générale, Université de Liège, 3 Allée de la Chimie, B6, Sart-Tilman, 4000 Liège, Belgium
A. Rulmont
Affiliation:
Laboratoire de Chimie Inorganique Structurale, Département de Chimie Générale, Université de Liège, 3 Allée de la Chimie, B6, Sart-Tilman, 4000 Liège, Belgium
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Abstract

Three phosphates, MIBaIn2(PO4)3 with MI=Na, K, Cs, isostructural to the langbeinite structure, have been studied from powder diffraction data collected with monochromatic radiation obtained from a conventional X-ray source. Precise powder data are reported, as well as cell parameters, i.e., a=10.026 08(9) Å, a=10.121 57(13) Å and a=10.226 94(9) Å for MI=Na, K and Cs, respectively. A Rietveld refinement has been carried out (space group P213), with final RF factors, 0.061, 0.041 and 0.027, and Rwp factors, 0.196, 0.142 and 0.129, for MI=Na, K and Cs, respectively. There are two octahedrally coordinated In3+ ions in the asymmetric unit and the final refinements suggest disorder on the two sites of the MI/Ba sublattice.

Type
Technical Articles
Information
Powder Diffraction , Volume 17 , Issue 1 , March 2002 , pp. 1 - 6
Copyright
Copyright © Cambridge University Press 2002

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