Abstract
The formation and breakdown characteristics of anodic oxide films grown on tantalum, their dielectric properties and the effects of heating such films have been studied. The behaviour of such films formed in the presence of UV radiation is also reported. Steady state kinetic data obtained at different temperatures and current densities indicate a temperature-independent Tafel slope which rules out the applicability of the single-barrier theory of Cabrera and Mott. The data have been analysed in terms of Dignam's equation. There is an appreciable (27%–37%) contribution of the quadratic term. The effects of temperature, current density and composition of the electrolytes on various parameters of Dignam's equation have been examined. Single-barrier theories of ionic conduction do not explain the data satisfactorily.
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