Oxygen‐18 exchange between gaseous oxygen, held at a pressure of 125 mm Hg in a Pt10Rh chamber, and spheres of α‐Cr 2 O 3 containing three or less grains was determined from 1100° to 1450°C. Isotope equilibrium on crystal surfaces appears to be quickly established, and the rate‐determining factor is self‐diffusion conforming to the relation D = 15.9 exp(‐101,000/ RT) cm 2 sec −1 . Changing sphere diameters caused no detectable variation in diffusion coefficients. Anions are the much slower diffusing species in this oxide.
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W. C. Hagel (1965) studied this question.
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