Vanadyl ion stability in silica gels

被引：13

作者：

Devi, PS ^{[1
]}

Ganguli, D ^{[1
]}

机构：

[1] Cent Glass & Ceram Res Inst, Sol Gel Div, Calcutta 700032, W Bengal, India

来源：

JOURNAL OF NON-CRYSTALLINE SOLIDS | 1998年 / 240卷 / 1-3期

关键词：

D O I：

10.1016/S0022-3093(98)00709-1

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：

Silica gels doped with vanadium were prepared from tetra ethyl orthosilicate and an aqueous solution of NH4VO3, at a final sol pH of 1.5-2.5. Absorption and electron paramagnetic resonance (EPR) spectral studies establish that under ambient conditions the incorporated pentavalent vanadium is stabilized as tetravalent vanadyl ion in the gel monoliths. Dried gels were very stable under ambient conditions, however, transformation of V4+ to V5+ was noted during gel densification. (C) 1998 Elsevier Science B.V. All rights reserved.

引用

页码：50 / 54

页数：5

共 19 条

[1] The Electronic Structure of the Vanadyl Ion
Ballhausen, C. J.
Gray, Harry B.
[J]. INORGANIC CHEMISTRY, 1962, 1 (01) : 111 - 122
[2] Novel wet process for preparation of vanadium oxide thin film
Deki, S
Aoi, Y
Miyake, Y
Gotoh, A
Kajinami, A
[J]. MATERIALS RESEARCH BULLETIN, 1996, 31 (11) : 1399 - 1406
[3] DEVI PS, 1997, J NONCRYST SOLIDS, V203, P78
[4] Vanadia-silica low-temperature aerogels: Influence of aging and vanadia loading on structural and chemical properties
Dutoit, DCM
Schneider, M
Fabrizioli, P
Baiker, A
[J]. CHEMISTRY OF MATERIALS, 1996, 8 (03) : 734 - 743
[5] DUTOIT DCM, 1997, J MATER CHEM, V7, P27
[6] Da Silva MGF, 1994, J SOL-GEL SCI TECHN, V2, P895
[7] Electrical switching in VO2 sol-gel films
Guzman, G
Beteille, F
Morineau, R
Livage, J
[J]. JOURNAL OF MATERIALS CHEMISTRY, 1996, 6 (03) : 505 - 506
[8] IRON(II)-CONTAINING OR VANADIUM(IV)-CONTAINING SILICEOUS GELS
HUTTER, F
SCHMIDT, H
SCHOLZE, H
[J]. JOURNAL OF NON-CRYSTALLINE SOLIDS, 1986, 82 (1-3) : 373 - 377
[9] INTERFACE PROPERTIES OF VANADIUM PENTOXIDE GELS
LIVAGE, J
[J]. MATERIALS RESEARCH BULLETIN, 1991, 26 (11) : 1173 - 1180
[10] MOBILITY AND REACTIONS OF VO2+ ON HYDRATED SMECTITE SURFACES
MCBRIDE, MB
[J]. CLAYS AND CLAY MINERALS, 1979, 27 (02) : 91 - 96

← 1 2 →