Formation of gels and gel-glasses in the VO2(V2O5)-SiO2 systems |
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| Authors: | B Samuneva V Dimitrov Y Dimitriev V Chernev G Gochev |
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| Institution: | (1) Higher Institute of Chemical Technology, 1756 Sofia, Bulgaria;(2) Kliment Ohridski University, Sofia, Bulgaria |
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| Abstract: | 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 VOSO4·5H2O. 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°C have been obtained from gels containing 1–3 mol% VO2. |
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| Keywords: | coloured gels vanadium oxides silica glass structure redox-oxidation |
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