Some electrode charge-transfer effects in solid ionic materials

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Abstract
Recent work on electrode polarization effects in ionic conductors is discussed and extended. Contrary to a recent suggestion, analysis of the ac conduction and electrode processes occurring in such materials should involve effectively mobile charged species of both signs, not just a single mobile species. Special consideration of likely charge‐transfer reactions in solid materials such as β‐alumina with platinum electrodes leads to a new specific result for the Warburg impedance appropriate for such situations. The over‐all impedance of the system involves a very high parallel capacitance showing ω−m frequency response, with 0.5≤m ≤1.5, of the type very frequently found experimentally.

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