XAFS study of TiO2/SiO2 system prepared by sol-gel from inorganic precursors

Authors
Kriventsov, VV Kochubey, DI Tsodikov, MV Navio, JA Restrepo, GM Macias, M
Citation
Vv. Kriventsov et al., XAFS study of TiO2/SiO2 system prepared by sol-gel from inorganic precursors, NUCL INST A, 470(1-2), 2001, pp. 347-352
Citations number
11
Categorie Soggetti
Spectroscopy /Instrumentation/Analytical Sciences","Instrumentation & Measurement
Journal title
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
ISSN journal
01689002 → ACNP
Volume
470
Issue
1-2
Year of publication
2001
Pages
347 - 352
Database
ISI
SICI code
0168-9002(20010901)470:1-2<347:XSOTSP>2.0.ZU;2-0
Abstract
The samples of 5%TiO2/SiO2 prepared by sol-gel method from inorganic precur sors calcinated at the various temperatures were studied by XAFS spectrosco py at Siberian Synchrotron Radiation Center. It was established that struct ural lability of this system and the change of symmetry of the oxygen coord ination around the Ti(+4) ions depends on the calcination temperature. It s eems that the mechanism of dissolution of the Ti(4+) ions in SiO2 depends o n the calcination temperature and consists in the formation of Wadsley defe cts following the incorporation of SiO2 in TiO2 particles. (C) 2001 Elsevie r Science B.V. All rights reserved.