Theory of Ionic Conduction in Solids

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Abstract
When a constant field in the 10 V cm−1 range is applied to annealed anodic oxide films the ion current builds up in accelerating fashion. It is shown that a model in which the ions move through channels in the oxide and in which the moving ions clear the initially blocked channels reproduces the general form of the ion current vs. time behavior. Dignam's theory of this process is discussed. A recent claim that considerations of mean free path render inapplicable to these films models in which the concentration of ions changes with field due to homogeneous generation of Frenkel defects is shown to be unjustified.A further observed phenomenon in which the latent ionic conductivity of the films decays at zero field is also discussed in terms of the competing models.

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