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In situ EXAFS and XANES measurements of the change in Ti coordination during the calcination of a (TiO2)(0.18) (SiO2)(0.82) aerogel

Pickup, David M., Mountjoy, Gavin, Holland, Mark A., Wallidge, Graham, Newport, Robert J., Smith, Mark E. (2000) In situ EXAFS and XANES measurements of the change in Ti coordination during the calcination of a (TiO2)(0.18) (SiO2)(0.82) aerogel. Journal of Physics: Condensed Matter, 12 (47). pp. 9751-9760. ISSN 0953-8984. (doi:10.1088/0953-8984/12/47/303) (KAR id:15951)

Abstract

The calcination of a (TiO2)(0.18)(SiO2)(0.82) aerogel has been followed using in situ high-temperature Ti K-edge 'quick EXAFS' and XANES measurements. The results clearly show that the coordination of Ti in this material changes from a mixture of four- and sixfold to predominantly fourfold as the temperature is increased from ambient to 300 degreesC. The decrease in static disorder, as the environment of Ti converts to predominantly a single site, is such that the overall Debye-Waller factor for the Ti-O shell decreases markedly even as the temperature increases to 700 degreesC. Combined 'quick EXAFS' and XANES measurements are shown to be valuable tools for in situ studies of structural changes associated with thermal treatment of amorphous materials.

Item Type: Article
DOI/Identification number: 10.1088/0953-8984/12/47/303
Subjects: Q Science
Divisions: Divisions > Division of Natural Sciences > Physics and Astronomy
Depositing User: J.M. Smith
Date Deposited: 08 May 2009 09:21 UTC
Last Modified: 16 Nov 2021 09:53 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/15951 (The current URI for this page, for reference purposes)

University of Kent Author Information

Pickup, David M..

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Mountjoy, Gavin.

Creator's ORCID: https://orcid.org/0000-0002-6495-2006
CReDIT Contributor Roles:

Newport, Robert J..

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