Harries J E, Hasnain S S, Shah J S
SERC Daresbury Laboratory, Warrington, UK.
Calcif Tissue Int. 1987 Dec;41(6):346-50. doi: 10.1007/BF02556675.
A structural characterization of pure hydroxyapatite and partially carbonated hydroxyapatites has been performed using EXAFS spectroscopy, X-ray diffraction, and infrared spectroscopy. Our findings show that marked structural changes within the hydroxyapatite unit cell accompany the substitution of the phosphate anion. Extended X-ray Absorption Fine Structure (EXAFS) spectroscopy has shown that the incorporation of carbonate into the phosphate site alters the structural geometry beyond the nearest neighbor oxygen coordination to calcium in a manner consistent with an increase in structural disorder. The nearest neighbor coordination to calcium is not detectably affected by the presence of carbonate.
利用扩展X射线吸收精细结构（EXAFS）光谱、X射线衍射和红外光谱对纯羟基磷灰石和部分碳酸化羟基磷灰石进行了结构表征。我们的研究结果表明，羟基磷灰石晶胞内的显著结构变化伴随着磷酸根阴离子的取代。EXAFS光谱表明，碳酸根掺入磷酸根位点会改变结构几何形状，超出与钙的最近邻氧配位，其方式与结构无序度增加一致。碳酸根的存在对与钙的最近邻配位没有可检测到的影响。
