The diffusion rate of oxygen in anion-deficient zirconia, ZrO1.994, has been determined by the interface migration of stoichiometric oxide and is represented by the equationnD = 0.055 exp (-33,400 ± 3100/RT).nA comparison was made with other processes which occur in the metal and the oxide. Excellent agreement was noted between activation energies of oxygen diffusion in ZrO.1.994, and those for parabolic or cubic oxidation in both air and water. It appears that oxygen diffusion in the oxide is rate-controlling during oxidation of the metal. The corrosion and oxidation behavior of zirconium and some alloys are discussed in terms of the oxide defect structure and the electrical conduction behavior in the oxide.
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