Micro-structural study of the GeS2–In2S3–KCl glassy system by Raman scattering

Room temperature Raman spectra of samples on three serials within the GeS2–In2S3–KCl glassy system have been investigated systematically. According to XRD patterns and Raman spectra of several pseudo-binary systems, the Cl atoms, which was added into the GeS2–In2S3 glasses through KCl, was considered to be leading to the breaking of In–In bonds among the S3In–InS3 ethane-like units and the forming of InS4−xClx, InS6−xClx mixed polyhedra. Considering the effect of K+ ions upon mixed anion units (InS4−xClx and InS6−xClx) and the corresponding micro-structural model, the Raman spectral evolution of the GeS2–In2S3–KCl glasses can be elucidated successfully. The microstructure of the GeS2–In2S3–KCl glasses was considered to be that the potassium atoms, which exist in the form of chlorine atoms as its nearest neighbor, are homogeneously dispersed in the glassy net formed by the micro-structural units such as InS4, InS6, InS4−xClx, InS6−xClx, GeS4 polyhedra and S3In(Ge)–In(Ge)S3 ethane-like units.