The Effect of Boric Acid on the Dielectric Properties of Hydrous Alumina Films

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Abstract
Aging hydrous aluminum oxide films in boric acid solutions accelerated the surface area decrease and markedly changed the dielectric properties of the films. The effect on dielectric properties could be removed by immersion in a borate‐free electrolyte. The observations were accounted for by a model in which adsorbed borate anions increased the relaxation time of a Maxwell‐ Wagner process occurring within a compact inner region of the films. It was postulated that borate anions penetrated to the interior of the oxide by diffusion along platelet surfaces. Borate was the only anion found to exert this particular effect on the hydrous oxide films.

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