Diffusion of Xenon in Ceramic Oxides

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Abstract
Postirradiation measurements were made at 700° to 1500°C of the release of 133Xe recoiled into single‐crystal α‐Al2O3, BeO, MgO, and ZrO2 crystals during neutron irradiation in contact with UO2 powder. The release pattern from most of the specimens was identical: a high rate of loss of 133Xe for several minutes followed by a slower release for which the cumulative fractional release was linear with the square root of the heating time. Diffusion coefficients for 133Xe have been calculated from the slope of the release curve following the initial release. The magnitudes of the diffusion coefficients above 1100°C for α‐Al2O3, BeO, and MgO were nearly the same whereas the diffusion coefficients in ZrO2 were ten to a hundred times larger. The activation energy for 133Xe release from α‐Al2O3 above 1100°C was 64 kcal/g‐mole. The xenon release behavior has been compared to anion diffusion in these oxides.

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