THE STRUCTURE OF TITANIUM SILICATE-GLASSES INVESTIGATED BY SI K-EDGE X-RAY-ABSORPTION SPECTROSCOPY

The structure of glasses along the TjO(2)-SiO2 join, have been investi gated using Si K-edge extended X-ray absorption fine structure spectro scopy (EXAFS) and W-ray absorption near-edge spectroscopy (XANES). XAN ES spectra of glasses along the TiO2-SiO2 join indicate that the Si en vironment is similar in all glasses. The addition of TiO2 has little a ffect on the SiO2 network and there is Ilo significant distortion of t he SiO, tetrahedron nor change in Si-O-Si bond angle. The calculated S i-O bond distance remains at about 1.60 even up to 11.6 mol% (14.9 wt% ) TiO2: well within the metastable glass region. No evidence is observ ed fur the formation of Ti clusters.