引氟量对含氟羟基磷灰石纳米晶结构的影响

INFLUENCE OF FLUORINE CONTENT ON CRYSTAL STRUCTURE OF NANO-FLUORHYDROXYAPATITE POWDERS

采用Ca(NO_3)_2·4H_2O-P_2O_5-NH_4F-乙醇体系,利用溶胶凝胶法在600℃获得不同含氟量的纳米含氟羟基磷灰石(FHA)粉体。通过X射线衍射分析(XRD)对纳米粉体进行了表征,讨论了不同引氟量对衍射峰强度、晶面间距、晶格常数及粒度的影响,并从FHA形成机理及结构构成方面解释了原因。结果表明,FHA主晶相衍射峰强度随引氟量增加,呈先减少后增加的趋势,晶面间距(特别是(300)晶面)逐渐减小,而晶格常数及粒度在a轴方向上亦呈现逐渐减少的趋势。

Nano-fluorhydroxyapatite （FHA） podwers with different fluorine content were fabricated at 600℃ with sol-gel method in Ca （NO3）2.4H20-P2O5-NH4F-alcohol system. The effects of fluorine content on interplanar distance, crystal lattice parameter and crystalline size etc. were discussed according to X-ray diffraction （XRD） analysis. The forming mechanism of FHA was investigated as well. It was indicated that with the increasing of fluorine content, the XRD peak intensity of FHA increased at first, but decreased later. However, the crystal lattice parameter, interplanar distance （300） and powder size were decreased with the fluorine content increased.