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Structural characterization of two K2SnX(PO4)3 (X=Fe,Yb) with langbeinite structure

Published online by Cambridge University Press:  01 March 2012

Abderrahim Aatiq ,
Btissame Haggouch ,
Rachid Bakri ,
Youssef Lakhdar  and
Ismael Saadoune
Abderrahim Aatiq*
Affiliation:
Université HassanII-Mohammédia, Faculté des Sciences Ben M’Sik, Département de Chimie, Laboratoire de Chimie des Matériaux Solides, Avenue Idriss El harti, B.P. 7955, Casablanca, Morocco
Btissame Haggouch
Affiliation:
Université HassanII-Mohammédia, Faculté des Sciences Ben M’Sik, Département de Chimie, Laboratoire de Chimie des Matériaux Solides, Avenue Idriss El harti, B.P. 7955, Casablanca, Morocco
Rachid Bakri
Affiliation:
Université HassanII-Mohammédia, Faculté des Sciences Ben M’Sik, Département de Chimie, Laboratoire de Chimie des Matériaux Solides, Avenue Idriss El harti, B.P. 7955, Casablanca, Morocco
Youssef Lakhdar
Affiliation:
Université HassanII-Mohammédia, Faculté des Sciences Ben M’Sik, Département de Chimie, Laboratoire de Chimie des Matériaux Solides, Avenue Idriss El harti, B.P. 7955, Casablanca, Morocco
Ismael Saadoune
Affiliation:
Centre d’ Excellence de Recherche sur les Matériaux (CERM), Laboratoire de Chimie des Matériaux et de l’ environnement, Av. A. Khattabi, B.P. 549, Marrakech, Morocco
*
a)Electronic mail: a_aatiq@yahoo.fr
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Abstract

Structures of two K2SnX(PO4)3(X=Fe,Yb) phosphates, obtained by conventional solid state reaction techniques at 950 °C, were determined at room temperature by X-ray powder diffraction using Rietveld analysis. The two materials exhibit the langbeinite-type structure (P213 space group, Z=4). Cubic unit cell parameter values are: a=9.9217(4) Å and a=10.1583(4) Å for K2SnFe(PO4)3 and K2SnYb(PO4)3, respectively. Structural refinements show that the two crystallographically independent octahedral sites (of symmetry 3) have a mixed Sn∕X (X=Fe,Yb) population although ordering is stronger in the Yb phase than in the Fe phase.

Keywords

tinytterbium and iron phosphatelangbeinite structureRietveld refinementX-ray diffraction

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Type
Technical Articles
Information
Powder Diffraction , Volume 21 , Issue 3 , September 2006 , pp. 214 - 219
Copyright
Copyright © Cambridge University Press 2006

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