BaS-Ga_2S_3ガラスの熱的安定性に及ぼすGeS_2の添加効果

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The characteristic temperatures and structure of BaS-Ga2S3-GeS2 (BGGS) glasses in a series of (100-x)[65BaS-35Ga2S3]-xGeS2 in molar ratio are studied. Glass samples were prepared by a melt quenching method using vitreous carbon crucibles in an inert atmosphere and using vacuumed silica ampoules. Variations in glass transition temperature Tg and onset of crystallization, Tx, with GeS2 concentration are evaluated. The addition of GeS2 enhances the thermal stability evaluated by the temperature difference of Tx-Tg. Raman spectroscopy suggests that mixed-anion networks of GaS4 and GeS4 with the possibility of GeO2 quartz structure for an impurity are formed, which contributes to a good thermal stability of these glasses with Tx-Tg >200°C. The BGGS glass fiber with an optimized composition could be continuously formed.
2005-06-25