Atomic transport in heavily defective solids

Abstract

We review the various models used to describe atomic transport in highly disordered solids. Detailed consideration is given first of cluster models in doped alkaline earth fluorides and non-stoichometric Fe_1-x O, and secondly of the application of simulation methods especially using Monte Carlo techniques whose use is illustrated by work on Y-doped CeO₂. Thirdly we show how statistical mechanical models may be used in studying cation distributions in glasses, leading to possible interpretations of the mixed alkali effect.