Mater. Res. Bull.

Fluoridated hydroxyapatite (FHAp) was successfully synthesized from the starting materials of CaCO3, CaBPO(4)center dot 2H(2)O, and CaF2 via a mechanochemical-hydrothermal route. X-ray diffraction, infrared spectroscopy, surface area measurements, and scanning electron microscopy identified the resultant powders as FHAp nanocrystals with the specific surface areas of up to 114.72 m(2)/g. The mechanism study revealed that under such mechanochemical-hydrothermal conditions the formation reactions of FHAp were completed in two stages. The starting materials firstly reacted into a poorly crystallized calcium-deficient apatite and the complete incorporation of fluoride ions into apatite occurred in the second stage. (c) 2005 Elsevier Ltd. All rights reserved.Fluoridated hydroxyapatite (FHAp) was successfully synthesized from the starting materials of CaCO3, CaBPO(4)center dot 2H(2)O, and CaF2 via a mechanochemical-hydrothermal route. X-ray diffraction, infrared spectroscopy, surface area measurements, and scanning electron microscopy identified the resultant powders as FHAp nanocrystals with the specific surface areas of up to 114.72 m(2)/g. The mechanism study revealed that under such mechanochemical-hydrothermal conditions the formation reactions of FHAp were completed in two stages. The starting materials firstly reacted into a poorly crystallized calcium-deficient apatite and the complete incorporation of fluoride ions into apatite occurred in the second stage. (c) 2005 Elsevier Ltd. All rights reserved