Abstract
The solubility of Dy 3+ ions in binary Ge-S glasses is studied. A mixture of Dy 2 S 3 , Ge and S raw materials in a silica ampoule was sealed under vacuum with 1-2 x 10 4 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 Dy 2 S 3 concentration is obtained for the 6 H 15/2 → 6 H 9/2 , 6 F 11/2 transition in the dissolved glasses. The dissolved concentration of Dy 2 S 8 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 2 S 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.
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