TiK-edge XANES study of the local environment of titanium in bioresorbable TiO2-CaO-Na2O-P2O5 glasses
TiK-edge XANES study of the local environment of titanium in bioresorbable TiO2-CaO-Na2O-P2O5 glasses
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DOI：
10.1007/s10856-007-3342-9
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发表时间：
2008-04-01
影响因子：
3.7
通讯作者：
Newport, Robert J.
中科院分区：
文献类型：
--
作者：
Pickup, David M.;Abou Neel, Ensanya A.;Newport, Robert J.
Ti K-edge XANES （x射线吸收近边结构）光谱用于研究钛在生物相容性和生物可吸收性tio2 - cao - na20 - p2o5玻璃中的局部配位。研究了由（TiO2）(x)(CaO)(0.30)(Na2O)((0.20-x))(P2O5)(0.50) （x = 0.01, 0.03和0.05）组成的传统熔融淬火玻璃和溶胶-凝胶衍生的（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，钛都被氧原子的八面体包围。进一步分析表明，与金红石、锐钛矿或CaSiTiO5相比，无定形样品中的TiO6位点没有严重扭曲。（TiO2）（0.25）（CaO）（0.25）（P2O5）（0.50）溶胶-凝胶样品的光谱显示，与热处理的溶胶-凝胶玻璃相比，干燥凝胶中TiO6位点的畸变更大。在蒸馏水中浸泡不同时间的熔融淬火玻璃样品的XANES光谱在长达14天的时间内没有显示出钛位点降解的任何证据。
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.