（CaO）x（TiO₂）0.5 - x（P₂O₅）0.5玻璃（x = 0和0.25）的溶胶 - 凝胶制备及高能X射线衍射研究
Sol-gel preparation and high-energy XRD study of (CaO)x(TiO2) 0.5-x(P2O5)0.5 glasses (x = 0 and 0.25).
作者信息
Pickup David M, Wetherall Kate M, Knowles Jonathan C, Smith Mark E, Newport Robert J
机构信息
School of Physical Sciences, University of Kent, Canterbury CT2 7NH, UK.
出版信息
J Mater Sci Mater Med. 2008 Apr;19(4):1661-8. doi: 10.1007/s10856-007-3259-3. Epub 2007 Oct 4.
Glasses from the CaO-TiO2-P2O5 system have potential use in biomedical applications. Here a method for the sol-gel synthesis of the ternary glass (CaO)0.25(TiO2)0.25(P2O5)0.5 has been developed. The structures of the dried gel and heat-treated glass were studied using high-energy X-ray diffraction. The structure of the binary (TiO2)0.5(P2O5)0.5 sol-gel was studied for comparison. The results reveal that the heat-treated (CaO)0.25(TiO2)0.25(P2O5)0.5 glass has a structure based on chains and rings of PO4 tetrahedra, held together by a combination of electrostatic interaction with Ca2+ ions and by corner-sharing oxygen atoms with TiO6 octahedra. In contrast, the (TiO2)0.5(P2O5)0.5 glass has a structure based on isolated P2O7 units linked together by corner-sharing with TiO6 groups. The results suggest that both the dried gels possess open porous structures. For the (CaO)0.25(TiO2)0.25(P2O5)0.5 sample there is a significant increase in Ca-O coordination number with heat treatment.
CaO-TiO₂-P₂O₅体系的玻璃在生物医学应用中具有潜在用途。本文开发了一种用于溶胶-凝胶合成三元玻璃（CaO）₀.₂₅（TiO₂）₀.₂₅（P₂O₅）₀.₅的方法。使用高能X射线衍射研究了干凝胶和热处理玻璃的结构。为作比较，研究了二元（TiO₂）₀.₅（P₂O₅）₀.₅溶胶-凝胶的结构。结果表明，热处理后的（CaO）₀.₂₅（TiO₂）₀.₂₅（P₂O₅）₀.₅玻璃具有基于PO₄四面体链和环的结构，通过与Ca²⁺离子的静电相互作用以及与TiO₆八面体的角共享氧原子相结合而保持在一起。相比之下，（TiO₂）₀.₅（P₂O₅）₀.₅玻璃具有基于通过与TiO₆基团角共享连接在一起的孤立P₂O₇单元的结构。结果表明，两种干凝胶均具有开放的多孔结构。对于（CaO）₀.₂₅（TiO₂）₀.₂₅（P₂O₅）₀.₅样品，热处理后Ca-O配位数有显著增加。
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