Superionic conductors exhibit a thermodynamic phase transition at a temperature T s , changing from a low ionic conductivity phase to a high ionic conductivity phase. The low temperature and high temperature phases are characterised by their diffusion characteristics, and are called the normal and the superionic regimes, respectively . The transition from the normal to the superionic regime can either be abrupt (type-I) or continuous (type II). For many superionic conductors, the atomistic mechanisms of ion transport in the superionic regime are not well understood. Furthermore, for type-II superionic transitions, the physical origins of the normal-to-superionic transition are often unclear . An improved understanding of ion transport in the superionic regime and the underlying physics of the superionic phase transition could significantly aid the development and optimisation of superionic solid electrolytes, with these having potential applications in various devices like fuel cells and all-solid-state batteries .