Abstract
The structure of 40NaO0.5⋅20GaO1.5⋅40TiO2 glass has been investigated by X-ray radial distribution analysis. Nearly all the Ga3+ and Ti4+ ions are four coordinated, constructing highly cross-linked three-dimensional glass networks, and that the number of non-bridging oxygens is very small. The degree of medium-range order in this glass is much lower than in the Na2O⋅2TiO2 glass studied in a previous paper, possibly due to the almost complete absence of TiO6 octahedra in the former glass. The higher glass-forming ability of the Na2O-Ga2O3-TiO2 ternary system compared with the Na2O-TiO2 binary system is ascribed mainly to the higher fraction of four-coordinated Ti4+ ions in the former system. It is suggested that in oxide systems glass-forming ability increases with increasing fraction of four-coordinated Ti4+ ions.
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