Formation of Gels and Gel-Glasses in the VO2(V2O5)-SiO2 Systems

被引：5
|
作者：
Samuneva, B. [1 ]
Dimitrov, V. [1 ]
Dimitriev, Y. [1 ]
Chernev, V. [1 ]
Gochev, G. [2 ]
机构：
[1] Higher Inst Chem Technol, BU-1756 Sofia, Bulgaria
[2] Kliment Ohridski Univ, Sofia, Bulgaria
来源：
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY | 1994年 / 2卷 / 1-3期
关键词：
coloured gels; vanadium oxides; silica glass; structure; redox-oxidation;
D O I：
10.1007/BF00486375
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Blue-coloured gels have been prepared in the VO2-SiO2 system up to 80 mol% VO2 by sol-gel technology using TEOS and aqueous solutions of VOSO4 center dot 5H(2)O. It is established by means of VIS and ESR spectra that at low temperatures VO2+ complexes are formed. An oxidation of V4+ has taken place with increasing temperature, and V2O5 and cristobalite have been separated. Silica gel glasses stable up to 800 degrees C have been obtained from gels containing 1-3 mol% VO2.
引用
收藏
页码：913 / 915
页数：3
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