Abstract

The multivalent β″-aluminas are the first family of high conductivity solid electrolytes for divalent and trivalent cations. The rich ion exchange chemistry of these materials leads to a variety of chemical environments within the conduction plane which consequently influence their ion transport and optical properties. This paper reviews some of the pertinent structural aspects of the multivalent β-aluminas and considers the properties of selected systems which contain either mixed ions or ions with two valence states within the conduction plane. The results indicate that the multivalent exchanged β-aluminas are excellent materials for studying the effects of ion/lattice and ion/ion interactions in 2-dimensional systems.

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