Mountjoy, G. and Rigden, J.S. and Anderson, R. and Wallidge, G.W. and Newport, R.J. and Smith, M.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.
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| Official URL http://dx.doi.org/10.1557/JMR.2000.0287 |
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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 |
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| 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: | 02 Dec 2011 11:52 |
| Resource URI: | http://kar.kent.ac.uk/id/eprint/15933 (The current URI for this page, for reference purposes) |
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