Fast-ion conduction and flexibility of glassy networks

Abstract

We observe two thresholds in the variations of electrical conductivity of dry solid electrolyte (AgI)x(AgPO3)1-x glasses, when the AgI additive concentration x increases to 9.5% and to 37.8%. Raman scattering complemented by calorimetric measurements confirm 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.

Accepted by PRL

References in corpus (5)

• Rings and rigidity transitions in network glasses
• Pressure Raman effects and internal stress in network glasses
• On adaptability and "intermediate phase" in randomly connected networks
• On the glass transition temperature in covalent glasses
• Correlation between floppy to rigid transitions and non-Arrhenius conductivity in glasses

Cited by in corpus (6)

• Relaxation and physical aging in network glasses: a review
• Intermediate Phases, structural variance and network demixing in chalcogenides: the unusual case of group V sulfides
• Fast-ion conduction and flexibility and rigidity of solid electrolyte glasses
• Designing heavy metal oxide glasses with threshold properties from network rigidity
• A simple solvable energy landscape model that shows a thermodynamic phase transition and a glass transition
• Structure and dynamics of liquid AsSe4 from ab initio molecular dynamics simulation