The permeability to oxygen of 4 wt% lime‐stabilized zirconia and hafnia and of pure thoria was determined between 1100° and 2050°C. The permeability constant (permeability multiplied by the thickness) at 25 torr oxygen pressure is given by: image A 1/4‐power oxygen pressure dependence of the permeability was found for zirconia and hafnia and a variable power dependence was found for thoria. The diffusivities for zirconia and hafnia were determined from the time dependence of permeation. These are given by: image A transport mechanism suggested for zirconia and hafnia involves migration of oxygen ion vacancies and electron holes.
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Smith et al. (1966) studied this question.
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