Abstract
Fast-ion conductors are solids with unusually high ionic conductivities, comparable to those found in molten salts. They have excited considerable attention because of their important technological applications, particularly as battery electrolytes. In addition, these materials present a difficult fundamental challenge as the phenomenon cannot be explained on the usual models of ionic conductors. This article focuses on the basic aspects of fast-ion conductors; it reviews the techniques that can be used to obtain information on the transport processes and considers the progress that has been made in understanding these processes. Examples are taken from the more thoroughly investigated fast-ion conductors, i.e. α-AgI, β-aluminas, fluorite-structured materials and polymer electrolytes.
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