ガラス形成と関係したナトリウムガロチタン酸塩ガラスの構造

概要

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The structure of 40NaO_<0.5> 20GaO_<1.5>・40Ti0_2 glass has been investigated by X-ray radial distribution analysis. Nearly all the Ga^<3+> and Ti^<4+> ions are four coordinated, constructing highly cross Iinked 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 Na_2O ・ 2TiO_2 glass studied in a previous paper, possibly due to the almost complete absence of TiO_6 octahedra in the former glass. The higher glass forming ability of the Na_2O-Ga_2O_3-TiO_2 ternary system compared with the Na_2O-TiO_2 binary system is ascribed mainly to the higher fraction of four coordinated Ti^<4+> ions in the former system. It is suggested that in oxide systems glass forming ability increases with increasing fraction of four coordinated Ti^<4+> ions.
1994-03-01