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Rietveld structural refinement of «A» type phosphostrontium carbonate hydroxyapatites

Published online by Cambridge University Press:  14 November 2013

Sonia Jebri
Tunis El Manar University, Faculty of Science, Chemistry Department, Applied Thermodynamics Laboratory, 2092, Tunis El Manar, Tunisia.
Habib Boughzala*
Tunis El Manar University, Faculty of Science, Chemistry Department, Laboratory of Crystallochemistry and Materials, 2092, Tunis El Manar, Tunisia.
Ali Bechrifa
Tunis El Manar University, Faculty of Science, Chemistry Department, Applied Thermodynamics Laboratory, 2092, Tunis El Manar, Tunisia.
Mohamed Jemal
Tunis El Manar University, Faculty of Science, Chemistry Department, Applied Thermodynamics Laboratory, 2092, Tunis El Manar, Tunisia.
Corresponding author: Habib Boughzala. Tel: (216) 20523595; fax: (216) 72220181 E-mail:


Phosphostrontium carbonate hydroxyapatites having the general formula Sr10(PO4)6(OH)(2-2x)(CO3)x were prepared by solid gas reaction at different temperatures in the range 0 ≤ x ≤ 1. Infrared spectroscopy investigation reveals a carbonate groups substituting hydroxyl ions. Intensity bands increasing with the carbonate amount introduced in the lattice, while the one corresponding to hydroxyl decreases until disappearance. The Rietveld refinement of the structural model using X-ray powder diffraction patterns is used to determine the substitution rate. It was quantified by the refinement of the occupancy sites affected by the substitution. The crystallographic study shows the evolution of the atomic coordinate in the apatite due to the carbonate incorporation. The variation of the main interatomic distances and the bond angles was also discussed.

Technical Articles
Copyright © International Centre for Diffraction Data 2013 

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