Abstract
Oxygen isotope diffusion coefficients were determined for via bulk and via grain‐boundary diffusion as functions of calcium content (x), temperatures from 1073 to 1273 K, and oxygen partial pressures from to at T = 1273 K. Both bulk and grain‐boundary diffusion coefficients increased with calcium content. For , the activation energy is 160 and for bulk and grain‐boundary diffusion, respectively. The bulk‐diffusion coefficient increased with decreasing oxygen partial pressure. The oxygen vacancy diffusion coefficient was calculated as at T = 1273 K, constant regardless of calcium content or oxygen‐vacancy content. The effect of surface exchange on the oxygen permeation through was quantitatively evaluated. © 2000 The Electrochemical Society. All rights reserved.
Published Version
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