Mobile-ion concentrations and mixed-alkali effects in β-alumina solid electrolytes |
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| Authors: | Malcolm D. Ingram Cornelius T. Moynihan |
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| Affiliation: | Department of Chemistry, University of Aberdeen, Aberdeen, Scotland, UK;Department of Materials Engineering, Rensselaer Polytechnic Institute, Troy, New York 12181, USA |
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| Abstract: | A theory of the mixed-alkali effect based on the weak electrolyte model is used in the analysis of conductivity isotherms in the Na/K β-alumina system. This gives mobile interstitialcy concentrations, [Na2+2] or [Na+i], which agree remarkably well with those obtained by Wolf from calculations based on changes in the Haven ratio, HR. The high conductivity of β-alumina arises apparently from a high “defect mobility” rather than from the existence of quasi-liquid motions. Other consequences of the weak electrolyte theory are discussed. |
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