Mixed cation Ag2S-Tl2S-GeS2 glasses: macroscopic properties and Raman scattering studies
- 17 June 2020
- journal article
- research article
- Published by IOP Publishing in Journal of Physics: Condensed Matter
- Vol. 32 (26), 264004
- https://doi.org/10.1088/1361-648X/ab7c91
Abstract
Mixed cation Ag2S-Tl2S-GeS2 glasses containing 40 and 50 mol% of metal sulfide have been synthesized and analyzed for the first time using thermal analysis, conductivity measurements and Raman spectroscopy. The composition dependences of the ionic conductivity and glass transition temperature T-g showed the presence of classical mixed cation effect with the minimum of both glass transition temperature and room temperature conductivity and the activation energy maximum centered at r = Ag/(Tl + Ag) approximate to 0.2. Raman spectroscopy measurements reveal that the structure of the mixed glasses is not a simple mixture of the end-members, pure thallium (r = 0) and silver (r = 1) thiogermanates. The edge-sharing ES-Ge2S6 dimers and corner-sharing CS-GenS3n+1 (n = 2 or 3) oligomers disappear more quickly than is predicted by the stoichiometry relations. The systematic evolution of the vibrational properties as a function of the silver fraction r also suggests that the both cations are not separated spatially in the glass network but rather located in close proximity to each other.This publication has 48 references indexed in Scilit:
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