Ionic conductivity in Na+, K+, and Ag+ β″-alumina |
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| Authors: | JL Briant GC Farrington |
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| Institution: | General Electric Corporate Research and Development, P.O. Box 8, Schenectady, New York 12301 USA |
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| Abstract: | This paper presents measurements of the ionic conductivity in single crystals of β″-alumina (0.84 M2O · 0.67 MgO · 5.2 Al2O3, M = Na, K, Ag). Single crystals of sodium β″-alumina were grown from a melt of Na2O, MgO, and Al2O3 at 1660 to 1730°C. Selected crystals were converted to the other isomorphs by ion exchange. The conductivity of sodium β″-alumina varies from 0.18 to 0.01 (ohm · cm)?1 at 25°C depending upon crystal growth conditions. Potassium β″-alumina has the unusually high room temperature conductivity of 0.13 (ohm · cm)?1. Silver β″-alumina has a slightly lower conductivity, 4 × 10?3 (ohm · cm)?1 at 25°C. The activation energies of sodium and potassium β″-alumina decrease with increasing temperature, while that of silver β″-alumina is constant from ?80 to 450°C. |
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| Keywords: | To whom correspondence should be addressed Present address: Department of Materials Science and Engineering K1 University of Pennsylvania Philadelphia Pa 19104 |
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