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

Room temperature Raman spectra of samples on three serials within the GeS(2)-In(2)S(3)-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 GeS(2)-In(2)S(3) glasses through KCl, was considered to be leading to the breaking of In-In bonds among the S(3)In-InS(3) ethane-like units and the forming of InS(4-x)Cl(x), InS(6-x)Cl(x) mixed polyhedra. Considering the effect of K(+) ions upon mixed anion units (InS(4-x)Cl(x) and InS(6-x)Cl(x)) and the corresponding micro-structural model, the Raman spectral evolution of the GeS(2)-In(2)S(3)-KCl glasses can be elucidated successfully. The microstructure of the GeS(2)-In(2)S(3)-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 InS(4), InS(6), InS(4-x)Cl(x), InS(6-x)Cl(x), GeS(4) polyhedra and S(3)In(Ge)-In(Ge)S(3) ethane-like units.