Silver environment and covalent network rearrangement in GeS3-Ag glasses

Rátkai, László and Kaban, I. and Wágner, T. and Kolář, J. and Valková, S. and Voleská, I. and Beuneu, B. and Jóvári, Pál (2013) Silver environment and covalent network rearrangement in GeS3-Ag glasses. JOURNAL OF PHYSICS-CONDENSED MATTER, 25 (45). ISSN 0953-8984

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Abstract

The structure of Ag-doped GeS3 glasses (0, 15, 20, 25 at.% Ag) was investigated by diffraction techniques and extended X-ray absorption fine structure measurements. Structural models were obtained by fitting the experimental datasets simultaneously by the reverse Monte Carlo simulation technique. It is observed that Ge has mostly S neighbours in GeS3, but Ge-Ge bonds appear already at 15% Ag content. Sulphur has ~2 S/Ge neighbours over the whole concentration range, while the S-Ag coordination number increases with increasing Ag content. Ag-Ag pairs can already be found at 15% Ag. The Ag-S mean coordination number changes from 2.17±0.2 to 2.86±0.2 between 15% and 25% Ag content. Unlike As-S network in AsS2-25Ag glass, the Ge-S network is not fragmented upon Agdoping of GeS3 glass.

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