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Oxygen self‐diffusion in alumina single crystals was investigated, using the proton activation technique to measure the 18 O profiles after the samples had been exchanged with an 18 O‐enriched gaseous environment. In the temperature range 1750 to 1950 K, the diffusion coefficient for a set of Czoch‐ralski‐grown samples, preannealed in air, is represented by image Samples which were not preannealed showed much greater penetration of 18 O and the concentration profiles in these samples were not consistent with Fickian behavior. Titania‐doped samples gave lower values of oxygen diffusion coefficient.
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Reddy et al. (1982) studied this question.
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