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Crystal structures of newly synthesized SbV1.50FeIII0.50(PO4)3 and (SbV0.50FeIII0.50)P2O7

Published online by Cambridge University Press:  01 March 2012

Abderrahim Aatiq  and
Rachid Bakri
Abderrahim Aatiq
Affiliation:
Faculté des Sciences Ben M’Sik, Département de Chimie, Laboratoire de Chimie des Matériaux Solides, Université HassanII-Mohammédia, Avenue Idriss El harti, B.P. 7955, Casablanca, Morocco
Rachid Bakri
Affiliation:
Faculté des Sciences Ben M’Sik, Département de Chimie, Laboratoire de Chimie des Matériaux Solides, Université HassanII-Mohammédia, Avenue Idriss El harti, B.P. 7955, Casablanca, Morocco
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Abstract

Synthesis and structure of two phosphates belonging to the ternary Sb2O5-Fe2O3-P2O5 system are reported. Structures of both SbV1.50FeIII0.50(PO4)3 and (SbV0.50FeIIIe0.50)P2O7 phases, obtained by solid state reaction in air atmosphere at 950 °C and 900 °C, respectively, were determined at room temperature from X-ray powder diffraction using the Rietveld method. Sb1.50Fe0.50(PO4)3 phosphate belongs to the Nasicon-type structure with R32 space group. Hexagonal cell parameters are ahex.=8.305(1) Å and chex.=22.035(2) Å. Rietveld refinement results show a 2-2 ordered distribution, along the c-axis, of X(1) and X(2) sites (crystallographic formula [Sb0.88Fe0.12]X(1)[Fe0.38Sb0.62]X(2)(PO4)3) in the Nasicon framework. (Sb0.50Fe0.50)P2O7 is isotypic with β-SbP2O7 pyrophosphate [Pna21 space group; a=7.865(1) Å, b=15.699(2) Å, c=7.847(1) Å]. Its crystal structure is built up from corner-shared SbO6 or FeO6 octahedra and P2O7 groups (two group types). Each P2O7 group shares its six vertices with three SbO6 and three FeO6 octahedra, and each octahedra is connected to six P2O7 groups. A quasi 1-1 ordered distribution, along the b-axis, of Sb5+ and Fe3+ ions in the pyrophosphate framework are observed.

Keywords

X-ray powder diffractionantimony and iron phosphateordered distributionNasiconpyrophosphate
Type
Technical Articles
Information
Powder Diffraction , Volume 22 , Issue 1 , March 2007 , pp. 47 - 54
Copyright
Copyright © Cambridge University Press 2007

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