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Advanced physical characterisation of the structural evolution of amorphous (TiO2)(x)(SiO2)(1-x) sol-gel materials

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Wallidge, Graham, Anderson, Ruth, Mountjoy, Gavin, Pickup, David M., Gunawidjaja, Philips N., Newport, Robert J. and Smith, Mark E. (2004) Advanced physical characterisation of the structural evolution of amorphous (TiO2)(x)(SiO2)(1-x) sol-gel materials. Journal of Materials Science, Volume 39 (Number 22). pp. 6743-6755. doi:10.1023/B:JMSC.0000045604.02983.96

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Official URL: http://dx.doi.org/10.1023/B:JMSC.0000045604.02983....

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Abstract

Amorphous (TiO2)(x)(SiO2)(1-x) (x = 0.08, 0.18, and 0.41) sol-gel formed materials have been characterised by a combination of X-ray and neutron diffraction, infra-red and Si-29 and O-17 magic angle spinning NMR spectroscopy. This combination allows new insight into the fundamental structural role titanium additions play in silica, entering the network at x = 0.08 but largely phase separating at x = 0.41. At an intermediate value of x = 0.18 there is complex coordination behaviour with initially some Ti-O-Ti linkages forming and both TiO4 and TiO6 coordinations present. It appears that at 500degreesC for the x = 0.18 sample all titanium is present in Ti-O-Si linkages but that this situation is unstable on further calcination. The new information presented here is amalgamated with that from our previous EXAFS, XANES and SAXS on the same samples to produce the most complete view to date of the local and mesoscopic structural behaviour of the (TiO2)(x)(SiO2)(1-x) system produced by the sol-gel method. (C) 2004 Kluwer Academic Publishers.

Item Type: Journal Article
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculty of Science > Physics
Journal or Publication Title: Journal of Materials Science
Publisher: Springer
ISSN: 0022-2461
Official Date: 2004
Dates:
DateEvent
2004Published
Volume: Volume 39
Number: Number 22
Number of Pages: 13
Page Range: pp. 6743-6755
DOI: 10.1023/B:JMSC.0000045604.02983.96
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access

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