Ion transport in Ca2+, Sr2+, Ba2+, and Pb2+ beta″ aluminas |
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| Authors: | R Seevers J deNuzzio GC Farrington B Dunn |
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| Institution: | Department of Materials Science, University of Pennsylvania, 3231 Walnut Street, Philadelphia, Pennsylvania 19104 USA;Department of Materials Science and Engineering, University of California, Los Angeles, Los Angeles, California 90024 USA |
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| Abstract: | Single crystals of Ca2+, Sr2+, Ba2+, and Pb2+ beta″ alumina were prepared from sodium beta″ alumina by ion exchange. The ionic conductivities of Ca2+, Sr2+, and Ba2+ beta″ alumina are comparable, about 3 × 10?2 (ohm-cm)?1 at 300°C. Surprisingly, Pb2+ beta″ alumina is much more conductive, 1.5 × 10?1 (ohm-cm)?1 at 300°C and 4.6 × 10?3 (ohm-cm)?1 at 40°C. Its conductivity approaches that of sodium beta″ alumina at temperatures below 25°C. The diffusion coefficient for Sr2+ in beta″ alumina at 600°C was estimated from radiotracer experiments. It is consistent with that expected from conductivity measurements. |
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