Divalent beta″-aluminas: High conductivity solid electrolytes for divalent cations |
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| Authors: | GC Farrington B Dunn |
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| Institution: | Department of Materials Science and Engineering, University of Pennsylvania, 3231 Walnut St., Philadelphia, PA 19104, USA;Department of Materials Science and Engineering, University of California at Los Angeles, Los Angeles, CA 90024, USA |
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| Abstract: | The Na+ content of beta″-alumina can be replaced by a variety of divalent cations in simple ion exchange reactions. The resulting divalent beta″-aluminas are the first family of high conductivity solid electrolytes for divalent cations. Divalent beta″-aluminas which have been prepared so far include conductors of Ca2+, Sr2+, Ba2+, Zn2+, Cd2+, Pb2+, Hg2+, and Mn2+. Most have conductivities of about 10-6 (Ω cm)-1 at 40°C and 10-1 (Ω cm)-1 at 300–400°C. However, the conductivity of Pb2+ beta″ alumina is 4.6x10-3 (Ω cm)-1 at 40°C, nearly equal to that of Na+ beta″-alumina. Preliminary structures studies indicate that order-disorder reactions among the divalent cations and vacancies in the conduction region of beta″-alumina critically influence conductivity in the structure. |
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