Abstract
Diffusion of oxygen in monodinic zirconia was studied using the oxygen-18 gas-solid exchange technique. The zirconia was in the form of spheres prepared by dropping the powdered material through a high temperature plasma. Diffusion was measured as a function of equivalent oxygen pressure, using oxygen and CO-CO2 mixtures, over the range 1 to 10−21 atm. In pure oxygen at 700 Torr and between 600 and 1000°C, the diffusion is described by the equation,D ⋆=2.34×10−2 exp — (45,300±1200)/RT. Experiments in CO-CO2 mixtures at 850°C gave self-diffusion coefficients that showed a slight decrease with a decrease in\(P_{O_2 } \) D ⋆ from 10−6 atm, and finally a decrease inD ⋆ from 10−19 to 10−21 atm. The behavior ofD ⋆ with\(P_{O_2 } \) appears to be in agreement with a defect model involving anti-Frenkel imperfections, i.e., oxygen interstitials and anion vacancies, if it is assumed that the mobility for oxygen interstitials is greater than that for oxygen vacancies.
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Keneshea, F.J., Douglass, D.L. The diffusion of oxygen in Zirconia as a function of oxygen pressure. Oxid Met 3, 1–14 (1971). https://doi.org/10.1007/BF00604736
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DOI: https://doi.org/10.1007/BF00604736