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.Keywords
This publication has 48 references indexed in Scilit:
- Recent achievements on sulfide-type solid electrolytes: crystal structures and electrochemical performanceJournal of Materials Science, 2017
- Chemical sensors with chalcogenide glassy membranesTalanta, 2005
- The mixed alkali effect as a consequence of network density and site energy distributionJournal of Non-Crystalline Solids, 2000
- Towards a theory for the mixed alkali effect in glassesJournal of Non-Crystalline Solids, 1999
- The dynamic structure model for ion transport in glassesJournal of Non-Crystalline Solids, 1994
- Anomalous ionic transport in glassy electrolytesIl Nuovo Cimento D, 1994
- EXAFS, glass structure and diffusionPhilosophical Magazine Part B, 1989
- Distribution of Cs+ ions in single and mixed alkali silicate glasses from energy dispersive x-ray diffractionJournal of Non-Crystalline Solids, 1986
- Mixed alkali glasses — Their properties and usesJournal of Non-Crystalline Solids, 1976
- The mixed alkali effect in glassJournal of Non-Crystalline Solids, 1969