采用沉淀法制备了纳米氟羟基磷灰石( FHA),研究了合成温度、初始氟离子浓度和pH值对氟替代的影响.用X射线衍射和红外光谱表征了FHA粉体的物相组成和晶体结构变化,用透射电镜观察了FHA的形貌.结果表明:氟替代会导致晶格参数和键能的变化,随着合成温度或原料中氟浓度的升高,FHA晶粒尺寸和长径比增大；相组成主要受pH值控制,考虑到OH-和F-对羟基空位的竞争,高pH值不利于氟替代.
The nanosized fluorhydroxyapatite (FHA) were synthesized by an aqueous precipitation method.The effects of synthesis temperature,molar ratio of NH4F to Ca(NO3)2.4H2O in the initial reagents[n(F-)/n(Ca2+)] and the pH value on the fluoride substitution were investigated.The phase composition and the change of crystal structure were characterized by X-ray diffraction (XRD) and Fourier transform infrared spectroscope (FT-IR).The morphology of FHA was observed by Transmission electron microscope (TEM).The results show that crystal lattice parameters and bond energy make changes by incorporation of F- ion in the structure.The size and aspect ratio of FHA crystals increase as the precipitation temperature and fluoride concentration.The phase composition of FHA is mainly controlled by the pH value.Considering the possibility of a competition between OH- and F-for occupation of the OH-site,high pH value isn't conductive to the fluoride substitution.
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