Journal Article

Rietveld structural refinement of super(<<)A super(>>) type phosphostrontium carbonate hydroxyapatites

Jebri, Sonia, Bechrifa, Ali, Boughzala, Habib, Jemal, Mohamed

2013

Overview

Phosphostrontium carbonate hydroxyapatites having the general formula Sr sub(10)(PO sub(4)) sub(6 )(OH) sub((2-2x))(CO sub(3)) sub(x) were prepared by solid gas reaction at different temperatures in the range 0 less than or equal to x less than or equal to 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.

• Subject: Apatite