Abstract
The oxygen permeability in [(ZrO 2) 1 − x (CeO 2) x ] 0.9(CaO) 0.1 ( x = 0.1−0.4) was measured at 1100–1800 K under the gradient of oxygen partial pressure created between air and inert gas. Tube shaped specimens were used with 13 and 9 mm outer and inner diameters respectively and lengths of 5 and 15 mm. One end of each specimen was fixed to an alumina tube and the other end to an alumina disk with Pt-O-rings at 1800 K, and were set in a SiC furnace. Air and helium were supplied to the outsides and insides of specimens respectively. The oxygen permeation rate was calculated from the increase in oxygen concentration and the flow rate of helium. The oxygen permeability was obtained from the oxygen permeations of two specimens different in length to eliminate the short-circuiting effect of Pt-O-rings. It was shown that the oxygen permeability was determined by the electronic conductivity of the solid solution, which was n-type, and increased as the Ce concentration and the temperature were increased.
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