Microstructure and thermal properties of the GeS2–In2S3–CsI glassy system

The homogeneous GeS2-In2 S3-Csl glassy samples were prepared by conventional meltquenching method. When the molar ratio of In2 S3, to Csl remains 1, the mm-crystalline region can extend to the composition 0.4 GeS2 -0.3In2S3 0.3 Csl. And with the addition of Csl, the glassforming ability of this serial glass reaches its maximum at the composition 0.8 GeS2 −0.1 In2 S3 −0.1 Csl. According to the Raman spectra, the microstructure of these glasses is mainly constituted by [GeSt] and [lnS4−xIx] telrahedra, which are interconnected by the bridging sulfur atoms; meanwhile, the ethaneliked structural units [S3 Ge−GeS3] can be formed because of the lacking of sulfur;Cs+ ion, which is added from Csl, exists as the nearest neighbor of I-ion in the glassy network.