Dilatometric studies on magnesium and fluorine-co-substituted hydroxyapatites
Written by sctunisie no commentsMagnesium- and fluoride-co-substituted hydroxyapatites (Ca9Mg(PO4)6(OH)2-yFy, where 0≤y≤2, have been synthesized by the hydrothermal method. The X-ray diffraction showed that all the powders were single-phased. The sintering behavior of powders was studied by dilatometry from 25 to 1200°C, and the sintered samples were investigated by using the XRD and scanning electron microscopy. During heating, there was a decomposition of the apatite due to the presence of Mg. The nature of the formed products was closely related to the fluorine content. For the compositions rich in fluorine, the end of the shrinkage was interrupted by the formation of a liquid phase thereby inducing the crystallization of needle like-crystals through a dissolution-diffusion-reprecipitation process.
S. Nsar, E. Ben Salem, K. Bouzouita
Apatite; Sintering; Thermal behavior
Pages: 191-200
