X-ray absorption near edge structure analysis of valence state and coordination geometry of Ti ions in borosilicate glasses

作者：Yang X C; Dubiel M; Ehrt D; Schuetz A

来源：Journal of Non-Crystalline Solids, 2008, 354(12-13): 1172-1174.

DOI：10.1016/j.jnoncrysol.2006.11.034

• borosilicates
• X-ray absorption

The effects of borosilicate glass composition and melting condition on valence state and coordination geometry of polyvalent Ti ions have been studied by X-ray absorption experiments. The results indicate that most of Ti3+ ions are oxidized into Ti4+ ions when Ti2O3 is doped into sodium borosilicate glasses. When TiO2 is doped into sodium borosilicate glasses, almost all of titanium ions are in the form of Ti4+. Doping both graphite and titanium oxide simultaneously in borosilicate glasses favors the formation of small amounts of Ti3+ ions. Ti4+ ions occupy both fivefold and sixfold coordinated sites in borosilicate glasses with non-bridging oxygen (NBSI), mainly fivefold coordinated sites. For borosilicate glasses without non-bridging oxygen (NBS2), Ti4+ ions are in both fourfold and fivefold coordinated sites. Using reducing agents during melting procedure favors the formation of fourfold coordinated Ti4+ ions in NBS2.

• 出版日期2008-2-15
• 单位同济大学