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.
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Almeida, R.M., De Barros Marques, M.I. & Orignac, X. EXAFS and XANES studies of silica-titania sol-gel films. J Sol-Gel Sci Technol 8, 293–297 (1997). https://doi.org/10.1007/BF02436854
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DOI: https://doi.org/10.1007/BF02436854