Ge-Sガラスにおけるジスプロシウムの溶解性

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The solubility of Dy^<3+> ions in binary Ge-S glasses is studied. A mixture of Dy_2S_3, Ge and S raw materials in a silica ampoule was sealed under vacuum with 1-2 ×10^4 Pa, melted at 1000℃ for 20 h with a slow rotation rate of <1 rpm and then quenched to room temperature to form a glass. The solubility is evaluated by naked eye, optical microscopy and absorption measurements in glass samples. A linear relation between absorption coefficient and Dy_2S_3 concentration is obtained for the ^6H_<15/2>, ^6H_<9/2>, ^6H_<11/2> transition in the dissolved glasses. The dissolved concentration of Dy_2S_3 increases with decreasing S concentration in the Ge-excess compositions under 66.7 mol% S. A solubility model is proposed based on GeS_2-like clusters existing in Ge-S glass melts. The dissolved concentration of Dy_2S_3 is at least 5 mass% (〜4×10^<26> Dy/m^3) at 60-62 mol% S (38-40 mol% Ge). This relatively-high solubility is related to the existence of Ge^<2-> modifier ions as discussed in our previous study.
社団法人日本セラミックス協会の論文
2003-03-01

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