Measurements of the direct current‐voltage characteristics of calcia‐stabilized zirconia using platinum electrodes of various types have been made to investigate possible electrode processes. Depending on the form of the electrode, the rate‐limiting step in the electrical conduction sequence can be ( a ) ionic conduction by O = in the zirconia, ( b ) electronic conduction in the zirconia, ( c ) oxygen atom diffusion through the platinum cathode, ( d ) the transfer of oxygen from the gas phase into the zirconia at the zirconia‐gas interface on the cathode side. The conditions, under which each of these situations exists, are explained in terms of the structure of the electrode.
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Brook et al. (1971) studied this question.