Title : Mechanism of ionic conduction in AgI-based superionic conducting glasses: A relation between charge carrier concentration and mobility of ions
Abstract:
Superionic conducting glasses such as AgI-based oxide glasses are known as one of the best solid electrolytes exhibiting high ionic conductivity comparable to the case of liquid electrolytes. However, the origin of the high ionic conductivity, as well as the relations with the structures and other physical quantities, remains unknown. In our previous studies, we have found an interesting relation between the ionic conduction and the medium range structures in superionic conducting glasses, and proposed a model for the temperature dependence of the ionic conductivity that exhibits a Vogel–Fulcher–Tammann (VFT)-like behaviour above the glass transition temperature Tg. Especially in the later study, the model was formulated based on the bond strength-coordination number fluctuation (BSCNF) model of viscosity.
In our presentation, after briefly reviewing our previous works related to the present study, we explore the relation between charge carrier concentrations and mobility in AgI-based superionic conducting glasses across Tg. The clarification of such a relation is not a trivial matter. To understand the microscopic mechanism of ionic conduction, we focus on a relation between the charge carrier concentration and the mobility of mobile ions. We will discuss the mechanism and the physical pictures of the ionic conduction.
Audience take away:
- We will provide useful knowledge from a theoretical perspective based on solid state physics.
- Our study will help the audience to understand the microscopic picture of ionic diffusions in solids, especially in solid electrolytes (or superionic conductors).
- The content of the present study is closely related with the vacancy formations in solids.
