Changes in Ti coordination number during pyrolysis of a SiO2-TiO2 gel

Changes in Ti coordination number during pyrolysis of a SiO2-TiO2 gel
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SiO2-TiO2 凝胶热解过程中 Ti 配位数的变化

DOI：
10.1016/0022-3093(86)90116-x
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发表时间：
1986
期刊：
影响因子：
--
通讯作者：
M. Momura
M. Momura
中科院分区：
--
文献类型：
--
作者：
H. Morikawa;T. Osuka;F. Marumo;A. Yasumori;M. Yamane;M. Momura

文献摘要

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用Si(OC_2H_5)_4和Ti[O(CH_2)_3CH_3]_4的混合溶液制备了含10%TiO_2的SiO_2-TiO_2凝胶，测量了经800℃以上高温处理的凝胶的K-吸收边以上的Ti-EXAFS(扩展X射线吸收精细结构)，估算的Ti-O距离表明，Ti4+离子首先进入凝胶结构的四配位，然后在400℃以上进一步热解，Ti--O距离变长。
A SiO2-TiO2gel containing 10 mol.% TiO2was prepared with the mixed solution of Si(OC2H5)4and Ti[O(CH2)3CH3]4. The Ti-EXAFS (Extended X-ray Absorption Fine Structure) above its K-adsorption edge was measured for the gel treated at elevated temperatures up to 800°C. The estimated TiO distance indicated that Ti4+ions were initially introduced into four-coordinated sites in the gel structure and then, the TiO distance betwme longer by the further pyrolysis above 400°C.