Fast-ion conduction and flexibility of glassy networks |
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Authors: | Novita Deassy I Boolchand P Malki M Micoulaut M |
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Affiliation: | Department of Electrical and Computer Engineering, University of Cincinnati, Cincinnati, OH 45221-0030, USA. |
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Abstract: | We observe two thresholds in the variations of electrical conductivity of dry (AgI)_{x}(AgPO3)_{1-x} solid electrolyte glasses, when the AgI additive concentration x increases to 9.5% and to 37.8%. Raman scattering complemented by calorimetric measurements confirms that these thresholds are signatures of the rigidity phase transitions at x=9.5% from a stressed rigid to an isostatically (stress-free) rigid phase, and at x=37.8% from isostatically rigid to a flexible phase. In the flexible phase, the electrical conductivity seems to increase as a power of x. This is in good agreement with the theoretical prediction based on 3D percolation. |
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