Pickup David M, Abou Neel Ensanya A, Moss Robert M, Wetherall Kate M, Guerry Paul, Smith Mark E, Knowles Jonathan C, Newport Robert J
School of Physical Sciences, University of Kent, Canterbury CT2 7NH, UK.
J Mater Sci Mater Med. 2008 Apr;19(4):1681-5. doi: 10.1007/s10856-007-3342-9. Epub 2007 Dec 23.
Ti K-edge XANES (X-ray absorption near edge structure) spectroscopy has been used to study the local coordination of titanium in biocompatible and bioresorbable TiO2-CaO-Na2O-P2O5 glasses. Both conventional melt-quenched glasses of composition (TiO2)x(CaO)0.30(Na2O)0.20-x(P2O5)0.50, where x = 0.01, 0.03 and 0.05, and sol-gel derived (TiO2)0.25(CaO)0.25(P2O5)0.50 glass have been studied. The results show that in all the materials studied, titanium is surrounded by an octahedron of oxygen atoms. Further analysis reveals that the TiO6 site in the amorphous samples is not heavily distorted relative to that in rutile, anatase or CaSiTiO5. The spectra from the (TiO2)0.25(CaO)0.25(P2O5)0.50 sol-gel samples reveal greater distortion in the TiO6 site in the dried gel compared to the heat-treated sol-gel glass. The XANES spectra from melt-quenched glass samples soaked in distilled water for various times do not shown any evidence of degradation of the titanium site over periods of up to 14 days.
钛K边X射线吸收近边结构（XANES）光谱已被用于研究生物相容性和生物可吸收的TiO2-CaO-Na2O-P2O5玻璃中钛的局部配位情况。研究了两种成分的玻璃，一种是传统的熔融淬火玻璃（TiO2）x（CaO）0.30（Na2O）0.20-x（P2O5）0.50，其中x = 0.01、0.03和0.05，另一种是溶胶-凝胶法制备的（TiO2）0.25（CaO）0.25（P2O5）0.50玻璃。结果表明，在所研究的所有材料中，钛都被氧原子八面体所包围。进一步分析表明，非晶态样品中的TiO6位点相对于金红石、锐钛矿或CaSiTiO5中的TiO6位点，畸变程度并不严重。（TiO2）0.25（CaO）0.25（P2O5）0.50溶胶-凝胶样品的光谱显示，与热处理后的溶胶-凝胶玻璃相比，干燥凝胶中的TiO6位点畸变程度更大。在蒸馏水中浸泡不同时间的熔融淬火玻璃样品的XANES光谱显示，在长达14天的时间内，钛位点没有任何降解迹象。
