47,49Ti NMR:: Evolution of crystalline TiO2 from the gel state

被引：25

作者：

Bastow, TJ ^{[1
]}

Whitfield, HJ ^{[1
]}

机构：

[1] CSIRO, Mfg Sci & Technol, Clayton, Vic 3169, Australia

来源：

CHEMISTRY OF MATERIALS | 1999年 / 11卷 / 12期

关键词：

D O I：

10.1021/cm990248r

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Ti-47,Ti-49 NMR has been used to monitor the transition to the crystalline state of titania gels, formed by the hydrolysis of titanium isopropoxide, which were progressively annealed to 700 degrees C. The gel spectrum consists of a single unresolved line, considerably narrower than that for anatase. The spectra from the intermediate anneals indicate the additional presence of only crystalline TiO2 anatase and rutile (the final product) and that these polymorphs coexist over a range of temperatures of at least 100 degrees C in the specimen, indicating the spatially inhomogeneous development of crystallinity in these gel specimens.

引用

页码：3518 / 3520

页数：3

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