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Bioinorganic Chemistry and Applications
Volume 2011, Article ID 453759, 10 pages
Research Article

Sintering Behavior of Magnesium-Substituted Fluorapatite Powders Prepared by Hydrothermal Method

U.R. Matériaux Inorganiques, Institut Préparatoire aux Etudes d'Ingénieur, University of Monastir, Rue Eben El Jazar 5019, Monastir 5000, Tunisia

Received 13 December 2010; Accepted 19 January 2011

Academic Editor: Lorenzo Pellerito

Copyright © 2011 S. Nasr and K. Bouzouita. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Magnesium-substituted fluorapatite powders were synthesized by hydrothermal method, and their sintering behavior was investigated by dilatometry in the temperature range 25–1100°C. Analysis of the obtained powders by X-ray diffraction and 31P NMR spectroscopy showed that the powders consisted of a single apatite phase and no amorphous phase has been formed. Compared to pure fluorapatite, the shrinkage of the substituted samples occurred in two steps and the temperature at which the sintering rate was maximum is lower. In addition, the shrinkage was interrupted by an expansion of the samples due to the formation of a liquid phase. The latter phase led to the crystallization of needle-crystals by a dissolution-diffusion-reprecipitation process.