Fundamental questions relating to ion conduction in disordered solids

Abstract

A number of basic scientific questions relating to ion conduction in homogeneously disordered solids are discussed. The questions deal with how to define the mobile ion density, what can be learned from electrode effects, what is the ion transport mechanism, the role of dimensionality, and what are the origins of the mixed-alkali effect, of time-temperature superposition, and of the nearly-constant loss. Answers are suggested to some of these questions, but the main purpose of the paper is to draw attention to the fact that this field of research still presents several fundamental challenges.

Reports on Progress in Physics, to appear

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• The Casimir Effect and the Foundations of Statistical Physics
• AC and DC conductivity correlation: The coefficient of Barton--Nakajima--Namikawa relation
• Stress-dependent electrical transport and its universal scaling in granular materials
• Physical mechanisms of nonlinear conductivity: a model analysis
• Aging of CKN: Modulus versus conductivity analysis
• Ionic conductivity of a lithium-doped deep eutectic solvent: Glass formation and rotation-translation coupling
• Impedance spectroscopy of ions at liquid-liquid interfaces
• Network-forming units, energy landscapes and conductivity activation energies in alkali borophosphate glasses: analytical approaches
• Normal and lateral Casimir force: Advances and prospects