磷灰石晶格热膨胀性质的实验研究

Study on thermal expansion of apatite lattice

本文采用高温粉晶X射线衍射技术 ,对溶胶—凝胶法合成羟基磷灰石 (Hap) ,提拉法合成氟磷灰石 (Fap)和天然沉积型碳氟磷灰石 (CFap)从室温到 95 0℃之间的晶格热膨胀系数进行了测定。实验结果表明 :在测试温度范围内 ,各样品的晶格膨胀系数与温度呈线性关系。Hap的△a/a与△c/c分别为 13 .8× 10 - 6 C- 1 和 15 .3× 10 - 6 C- 1 ,Fap的△a/a与△c/c分别为 15 .8× 10 - 6 C- 1 和 18.2× 10 - 6 C- 1 ,CFap的△a/a与△c/c分别为 15 .3× 10 - 6 C- 1 和 18.5× 10 - 6 C- 1 。在实验温度区间内未发现样品有明显的相变或结构转变现象 ,高温实验后样品的傅立叶变换红外光谱测定证实了这一推断。

The thermal expansion coefficients of the lattice parameters a and c of Hap,Fap and CFap were determined and discussed by means of high temperature XRD.In the temperature rang from room temperature to 950℃,the expansion coefficient degree of Hap were 13.8×10 -6 and 15.3×10 -6 ,The numerical values of △a/a and △c/c per degree of Fap were 15.8×10 -6 C -1 and 18.2×10 -6 C -1 and the numerical values of △a/a and △c/cper degree of CFap were 15.3×10 -6 C -1 and 18.5×10 -6 C -1 respectively.From the IR analysis it also could be concluded that there was no phase change or construct change in the temperature range showed above.