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Structure of a new CaII 1/3SbV 1/6BiIII 1/2PO4 phosphate

Published online by Cambridge University Press:  10 October 2013

Abderrahim Aatiq  and
My Rachid Tigha
Abderrahim Aatiq*
Affiliation:
Département de Chimie, Laboratoire de Physico-Chimie des Matériaux Appliqués, Faculté des Sciences Ben M'Sik, Université HassanII-Mohammédia, Avenue Idriss El harti, B.P. 7955, Casablanca, Morocco
My Rachid Tigha
Affiliation:
Département de Chimie, Laboratoire de Physico-Chimie des Matériaux Appliqués, Faculté des Sciences Ben M'Sik, Université HassanII-Mohammédia, Avenue Idriss El harti, B.P. 7955, Casablanca, Morocco
*
a) Author to whom correspondence should be addressed. Electronic mail: [email protected]
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Abstract

A new Ca1/3Sb1/6Bi1/2PO4 “CaSb0.50Bi1.50(PO4)3” phosphate has been synthesized by conventional solid-state reaction techniques at 900 °C in air atmosphere. Their crystallographic structures were determined at room temperature from X-ray powder diffraction (XRPD) data using the Rietveld analysis. CaII 1/3SbV 1/6BiIII 1/2PO4 material possesses the high-temperature BiPO4 monoclinic structure variety. It crystallizes in monoclinic system with P21/m space group and the cell parameters are: a = 4.9358(1) Å, b = 6.9953(2), c = 4.7075(1) Å, and β = 96.2(1)°. Their structure can be described as composed of alternating edge-sharing AO8 (A = Ca, Sb, Bi) bisdisphenoids and PO4 tetrahedra forming chains parallel to the b axis. Every AO8 polyhedron is surrounded by six PO4 and every PO4 tetrahedron is surrounded by six AO8 polyhedra. Infrared spectroscopic study was used to obtain further structural information.

Keywords

antimony and bismuth phosphatehigh BiPO4 monoclinic structure varietyIR spectroscopyRietveld analysis.
Type
Technical Articles
Information
Powder Diffraction , Volume 29 , Issue 1 , March 2014 , pp. 14 - 19
Copyright
Copyright © International Centre for Diffraction Data 2013 

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