Abstract
Tritium permeabilities of nickel over the 500 to 1100 K range have been determined and compared to deuterium and protium permeabilities. Solubility data for the three isotopes have been calculated from these permeability data and literature data for diffusivities. Then isotope effects on solubilities, diffusivities, and permeabilities were tabulated. Net isotope effects on hydrogen permeation above room temperatures decrease permeabilities for the heavier isotopes, and isotope effects extrapolated to 1500 K correspond to the square root of the inverse mass ratios. Tritium permeation rates were observed to vary with the square root of tritium pressures as low as 10/sup -10/ torr, and a general equation was derived to calculate hydrogen pressures at specific temperatures where the square root relationship may be expected to fail. 3 figures, 3 tables.
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