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The structure of (GeS$_2$)$_{0.75}$(Ga$_2$S$_3$)$_{0.25}$ and(GeS$_2$)$_{0.83}$(Ga$_2$S$_3$)$_{0.17}$ glasses was investigated by Ramanscattering, high energy X-ray diffraction and extended X-ray absorption finestructure (EXAFS) measurements at the Ga and Ge K-edges. The reverse MonteCarlo simulation technique (RMC) was used to obtain structural modelscompatible with diffraction and EXAFS datasets. It was found that thecoordination number of Ga is close to four. While Ge atoms have only Sneighbors, Ga binds to S as well as to Ga atoms showing a violation of chemicalordering in GeS$_2$-Ga$_2$S$_3$ glasses. Analysis of the corner- andedge-sharing between [GeS$_{4/2}$] units revealed that about 30% of germaniumatoms participate in the edge-shared tetrahedra.

Local motifs in GeS$_2$-Ga$_2$S$_3$ glasses