GeS₂-Sb₂S₃-CsX (X = Cl, Br, I) 系ガラスの作製と物性

抄録

Halide-incorporated chalcogenide glasses, i.e., chalcohalide glasses, have received much attention as the third family of non-oxide glass systems for improving properties of chalcogenide glasses. In this technical note, we report a systematic research on the glass formation and properties of glasses based on GeS₂-Sb₂S₃-CsX (X = Cl, Br, I) systems in which cesium halides are substituted for SbS_3/2 of 60GeS₂·40SbS_3/2 glass. Glasses were obtained until 20mol% substitution of CsCl and CsBr, and 25mol% substitution of CsI for SbS_3/2. By the substitution, glass transition temperatures lowered from 315°C by 60 K for CsCl, and by 40 K for CsBr and CsI. Densities decreased, and refractive indices at 980 nm decreased from 2.341 by about 0.2 for 20mol% substitution. Absorption edges at short wavelength side blue-shifted while those of the long wavelength side did not change. Raman spectra were also measured for structural analysis.