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EXAFS and XANES Studies of Silica-Titania Sol-Gel Films
Authors:RM Almeida  MI de Barros Marques  Xavier Orignac
Institution:(1) Departamento de Engenharia de Materiais/INESC, I.S.T., Av. Rovisco Pais, 1000 Lisboa, Portugal;(2) Centro de Física da Matéria Condensada, U.L., 2 Av. Prof. Gama Pinto, 1699 Lisboa Codex, Portugal
Abstract:A series of SiO2-TiO2 sol-gel films with and without heat treatment were analyzed by EXAFS and XANES spectroscopies. Both techniques indicate that essentially all Ti4+ ions remain four-fold coordinated, with a Ti–O bond distance between 1.82–1.85 Å. In the glassy films produced by heat treatment at 900° C, a gradual phase separation may occur at the nanoscale, as the TiO2 concentration of the films increases.
Keywords:SiO2  TiO2 films  EXAFS  XANES  synchrotron radiation  four-fold coordinated Ti  structure of sol-gel films
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