Silver sulfide based glasses (I). Glass forming regions,structure and ionic conduction of glasses in GeS2Ag2S and GeS2Ag2SAgI systems |
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Authors: | Evelyne Robinel Brigitte Carette Michel Ribes |
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Institution: | Laboratoire d''Energétique Electrochimique - L.A. 265, E.N.S.E.E.G., BP 75, 38402 Saint-Martin d''Hères, France;Laboratoire de Chimie Minérale, Chimie des Matériaux (E.R.A. 314), 34060 Montpellier-cedex, France |
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Abstract: | Ag2S forms with GeS2 stable glasses over a wide range of compositions (0–55% Ag2S mol%). In the same system, more complex glasses obtained by dissolving silver iodide have been synthesized with up to 50 mol% AgI.Raman spectra are presented and a vibrational assignment in terms of bridging and non-bridging sulfur has been made. The electrical conductivity of these glasses has been measured over a temperature range (?50°C? + 50°C) and for various compositions by the complex impedance diagram method. At 25°C, the conductivity reached a maximum value of 6 × 10?3 Ω?1 cm?1. Whatever the glass used, the same limit value of conductivity ) and activation energy () are obtained for the highest content of silver iodide. A conduction mechanism is proposed. |
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