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Synthesis and structural study from X-ray powder diffraction of Pb0.5Th2(PO4)3

Published online by Cambridge University Press:  10 January 2013

A. El-Yacoubi,
R. Brochu,
A. Serghini,
M. Louër,
M. Alami Talbi and
D. Louër
A. El-Yacoubi
Affiliation:
Laboratoire de Chimie du Solide, Faculté des Sciences, Rabat, Morocco
R. Brochu
Affiliation:
Laboratoire de Chimie du Solide et Inorganique Moléculaire (URA CNRS 1495), Groupe de Cristallochimie, Université de Rennes, Avenue du Général Leclerc, 35042 Rennes cedex, France
A. Serghini
Affiliation:
Laboratoire de Chimie du Solide, Faculté des Sciences, Rabat, Morocco
M. Louër
Affiliation:
Laboratoire de Chimie du Solide et Inorganique Moléculaire (URA CNRS 1495), Groupe de Cristallochimie, Université de Rennes, Avenue du Général Leclerc, 35042 Rennes cedex, France
M. Alami Talbi
Affiliation:
Laboratoire de Chimie du Solide, Faculté des Sciences, Rabat, Morocco
D. Louër
Affiliation:
Laboratoire de Chimie du Solide et Inorganique Moléculaire (URA CNRS 1495), Groupe de Cristallochimie, Université de Rennes, Avenue du Général Leclerc, 35042 Rennes cedex, France
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Abstract

A new mixed lead thorium phosphate, Pb0.5Th2(PO4)3, has been isolated in the system PbO–ThO2–P2O5. Its crystal structure (monoclinic symmetry, a=17.459(1) Å, b=6.8451(4) Å, c=8.1438(5) Å, β=101.247(5)°, space group C2/c) has been determined from conventional monochromatic X-ray powder diffraction data. The structure is related to the MITh2(PO4)3 structure type. Lead atoms are located in the channels parallel to the c axis, out of the twofold axis for 0.97 Å, and are statistically distributed on a quarter of crystallographic positions. The thermal stability of this material is greater than that of the monazite-type compound PbTh(PO4)2.

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Type
Research Article
Information
Powder Diffraction , Volume 12 , Issue 2 , June 1997, pp. 76 - 80
Copyright
Copyright © Cambridge University Press 1997

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