Inhomogeneities in acid-catalyzed titania-silica and zirconia-silica xerogels as revealed by small-angle x-ray scattering

Mountjoy, Gavin and Rigden, Jane S. and Anderson, Ruth and Wallidge, Graham and Newport, Robert J. and Smith, Mark E. (2000) Inhomogeneities in acid-catalyzed titania-silica and zirconia-silica xerogels as revealed by small-angle x-ray scattering. Journal of Materials Research, 15 (9). pp. 1998-2005. ISSN 0884-2914. (Full text available)

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http://dx.doi.org/10.1557/JMR.2000.0287

Abstract

The small-angle x-ray scattering (SAXS) technique was used to investigate inhomogeneities on the scale of 10 to 600 Angstrom in acid-catalyzed titania-silica and zirconia-silica xerogels. SAXS of (TiO2)(SiO2)(1-x) and (ZrO2)(x)(SiO2)(1-x) xerogels with x < 0.1, in which there was no phase separation, showed the presence of two types of inhomogeneity. For Q < 0.05 Angstrom(-1) there was a clear departure from Pored scattering which showed that xerogel powder particle surfaces were rough. For 0.1 < Q < 0.4 Angstrom(-1) there was a plateau feature corresponding to micropores within the silica-based network, and this feature changes with heat treatment. SAXS of xerogels with x > 0.3 showed the presence of phase-separated regions of metal oxide, which were initially amorphous and crystallized at higher temperatures. A (TiO2)(0.18)(SiO2)(0.82) xerogel that was not initially phase separated became phase separated after heat treatment at 750 degrees C due to reduced solubility of Ti in the silica network.

Item Type: Article
Subjects: Q Science
Divisions: Faculties > Science Technology and Medical Studies > School of Physical Sciences > Functional Materials Group
Depositing User: J.M. Smith
Date Deposited: 08 May 2009 09:49
Last Modified: 17 Jul 2014 09:26
Resource URI: http://kar.kent.ac.uk/id/eprint/15933 (The current URI for this page, for reference purposes)
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