Understanding the Mechanism of Superionic Transport from Trends of Materials Properties

The peculiarities of superionic conductors are elucidated by studying the chemical trends of materials properties and their correlations. Topics such as the role of medium range structure in the ion transport, fragility of superionic glass forming materials, relation between nonlinear optical constants and ionic transport properties, correlation between electron localization-itinerant property and the oxygen ionic conductivity in perovskite materials are treated and discussed using the bond fluctuation model of superionic conductors. It is pointed out that the bond fluctuation model could provide a key concept to understand the mechanism of superionic transport from a unified point of view.