Recent Developments in Beta Alumina.
CALIFORNIA UNIV LOS ANGELES DEPT OF MATERIALS SCIENCE AND ENGINEERING
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The multivalent Beta 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 Beta -aluminas and considers the properties of selected systems which contain either mixed ions or ions with two valence states within the conduction plane. The experimental and theoretical work reviewed herein indicate that a wide variety of chemical environments exist in the multivalent Beta -aluminas and that these environment influence properties. Ion transport processes in mixed ions systems were found to be influenced by correlated ion motion and ordering effects, while optical properties of lanthanide exchanged Beta -aluminas were quite sensitive to local configurations. The precise means by which properties are affected by chemical environments is an area worthy of continued interest, and the multivalent Beta -aluminas offer and excellent vehicle in which to study these effects in 2-dimensional environments.
- Physical Chemistry