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

Wallidge, Graham and Anderson, Ruth and Mountjoy, Gavin and Pickup, David M. and Gunawidjaja, Philips N. and 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, 39 (22). pp. 6743-6755. ISSN 0022-2461. (Access to this publication is restricted)

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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.

Item Type: Article
Subjects: Q Science
Divisions: Faculties > Science Technology and Medical Studies > School of Physical Sciences > Functional Materials Group
Depositing User: Bob Newport
Date Deposited: 12 Jul 2008 14:23
Last Modified: 08 Jul 2014 08:15
Resource URI: http://kar.kent.ac.uk/id/eprint/8221 (The current URI for this page, for reference purposes)
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