An EXAFS study of silica-titania sol-gels

Anderson, Ruth and Mountjoy, Gavin and Smith, Mark E. and Newport, Robert J. (1997) An EXAFS study of silica-titania sol-gels. Journal of Non-Crystalline Solids, 232 . pp. 72-79. ISSN 0022-3093. (Access to this publication is restricted)

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Abstract

A series of samples, with up to 41 mol%;, TiO2, have previously been studied using O-17 magic angle spinning nuclear magnetic resonance (MAS NMR) X-ray diffraction and neutron diffraction. We report here the results of an extended X-ray absorption fine structure (EXAFS) experiment an these samples, carried out to probe more directly the coordination state of the titanium site in the dried gel and its evolution with heat treatment. At Ti contents small enough to ensure atomic homogeneity, the data are consistent with 4-fold oxygen coordination around Ti,as indicated by the O-17 MAS NMR spectra. At Ti contents large enough to bring about phase separation, the results show evidence of a structural change around the Ti atoms, with a larger Ti-O distance compared with the results for the glasses with smaller TiO2 contents. (C) 1998 Elsevier Science B.V. All rights reserved.

Item Type: Article
Additional information: CAGLIARI, ITALY, SEP 15-19, 1997 Presidenza Giunta Reg; Reg Autonoma Sardegna, Assessorato Affari Gen; Camera Commercio Ind Artigianato & Agr; EMSA, Ente Minerario Sardo; Fdn Banco Sardegna; Univ Cagliari; CNR, Com Chim; INCM, Consorzio Interuniv Nazl Chim Mat; SARAS Raffinerie Sarde; Comune Iglisias; Assoc Univ Sulcis Iglesiente; Ente Sardo Ind Turistiche
Subjects: Q Science
Divisions: Faculties > Science Technology and Medical Studies > School of Physical Sciences > Functional Materials Group
Depositing User: J.M. Smith
Date Deposited: 29 Apr 2009 11:40
Last Modified: 11 Apr 2014 13:09
Resource URI: http://kar.kent.ac.uk/id/eprint/15863 (The current URI for this page, for reference purposes)
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