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Self‐diffusion coefficients of the oxygen ion in single‐crystal Y 2 O 3 were determined by the gas‐solid isotope exchange technique. The results in the range 1100° to 1500°C are described by D=7.3 X 10 ‐6 exp [‐19l(kJ/mol)/RT] cm 2 /s. Comparison of the results with those for oxides with the fluorite‐type structure indicates that the regularly arranged vacant anion sites in the C‐type structure do not contribute eflectively to oxygen ion diffusion .
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Ando et al. (1983) studied this question.
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