VANADYL ION STABILITY IN SILICA-GELS

Authors
Citation
Ps. Devi et D. Ganguli, VANADYL ION STABILITY IN SILICA-GELS, Journal of non-crystalline solids, 240(1-3), 1998, pp. 50-54
Citations number
19
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Material Science, Ceramics
ISSN journal
0022-3093
Volume
240
Issue
1-3
Year of publication
1998
Pages
50 - 54
Database
ISI
SICI code
0022-3093(1998)240:1-3<50:VISIS>2.0.ZU;2-5
Abstract
Silica gels doped with vanadium were prepared from tetra ethyl orthosi licate and an aqueous solution of NH4VO3, at a final sol pH of 1.5-2.5 . Absorption and electron paramagnetic resonance (EPR) spectral studie s establish that under ambient conditions the incorporated pentavalent vanadium is stabilized as tetravalent vanadyl ion in the gel monolith s. Dried gels were very stable under ambient conditions, however, tran sformation of V4+ to V5+ was noted during gel densification. (C) 1998 Elsevier Science B.V. All rights reserved.