RS-Ga_2S_3系硫化物ガラス(R=Ca,Sr,Ba)の生成領域と構造

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Gallium sulfide glasses were prepared in the RS-Ga_2S_3 (R = Ca, Sr, Ba) systems. Respective glass forming regions are 67.5-70.0 mol% CaS, 63.8-68.8 mol% SrS and 60.0-73.8 mol% BaS. Transmission spectra in the visible region, refractive index and glass transition and onset crystallization temperatures were measured for representative compositions of SrS- and BaS-Ga_2S_3 transparent glasses. Raman spectroscopy reveals that RS-Ga_2S_3 glasses consist of the network of GeS_4 tetrahedra due to the RS addition. The compositional dependence of molar volume indicates a plateau region at 65-70 mol% RS in SrS- and BaS-Ga_2S_3 glasses. The morphology of sulfur complex anions in RS-Ga_2S_3 glass melts is discussed using the sulfur-to-gallium ratio as a variable parameter. The combined results suggest that well-developed glass networks are formed near 66.7 mol% RS (S/Ga = 2.5) in the SrS- and BaS-Ga_2S_3 systems.
2003-05-01