Ge-Sガラスにおけるジスプロシウムの溶解性

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  • 武部 博倫
    九州大学大学院総合理工学研究院融合創造理工学部門
  • 石橋 俊行
    九州大学大学院総合理工学府量子プロセス理工学専攻
  • 村田 貴広
    九州大学大学院総合理工学研究院融合創造理工学部門
  • 森永 健次
    九州大学大学院総合理工学研究院融合創造理工学部門

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タイトル別名
  • Solubility of Dysprosium in Germanium Sulfide Glasses.

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The solubility of Dy3+ ions in binary Ge-S glasses is studied. A mixture of Dy2S3, Ge and S raw materials in a silica ampoule was sealed under vacuum with 1-2 × 104 Pa, melted at 1000°C 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 Dy2S3 concentration is obtained for the 6H15/2→6H9/2, 6F11/2 transition in the dissolved glasses. The dissolved concentration of Dy2S3 increases with decreasing S concentration in the Ge-excess compositions under 66.7 mol% S. A solubility model is proposed based on GeS2-like clusters existing in Ge-S glass melts. The dissolved concentration of Dy2S3 is at least 5 mass% (∼4 × 1026 Dy/m3) at 60-62 mol% S (38-40 mol% Ge). This relatively-high solubility is related to the existence of Ge2+ modifier ions as discussed in our previous study.

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