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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.
Fluoride-modified hydroxyapatite (FHA) was prepared by precipitation method, and the effect of synthesis temperature, initial fluoride concentration and pH value on the fluorine substitution was investigated. The phase composition of FHA powder was characterized by X-ray diffraction and infrared spectroscopy The morphology of FHA was observed by transmission electron microscopy.The results showed that the substitution of fluorine led to the change of lattice parameter and bond energy. With the increase of synthesis temperature or the concentration of fluorine in raw materials, the crystal size and long diameter Ratio increases; phase composition is mainly controlled by pH, taking into account the OH- and F- competition for hydroxyl vacancies, high pH is not conducive to fluoride replacement.