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The structure of Ag-doped GeS3 glasses (0, 15, 20, 25 at.% Ag) wasinvestigated by diffraction techniques and extended x-ray absorption finestructure measurements. Structural models were obtained by fitting theexperimental datasets simultaneously by the reverse Monte Carlo simulationtechnique. It is observed that Ge has mostly S neighbours in GeS3, but Ge-Gebonds appear already at 15% Ag content. Sulfur has ~2 S/Ge neighbours over thewhole concentration range, while the S-Ag coordination number increases withincreasing Ag content. Ag-Ag pairs can already be found at 15% Ag. The Ag-Smean coordination number changes from 2.17 +/- 0.2 to 2.86 +/- 0.2 between 15%and 25% Ag content. Unlike the As-S network in AsS2-25Ag glass, the Ge-Snetwork is not fragmented upon Ag-doping of GeS3 glass.

Silver environment and covalent network rearrangement in GeS3-Ag glasses