Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 32, Issue 26, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-648X/ab7c91
Keywords
thallium silver thiogermanate glasses; mixed cation effect; Raman spectroscopy
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Funding
- Region Hauts de France
- Ministere de l'Enseignement Superieur et de la Recherche (CPER Climibio)
- European Fund for Regional Economic Development
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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.
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