DIFFUSION AND PERMEATION OF DEUTERIUM IN PALLADIUM-SILVER AT HIGH TEMPERATURE AND PRESSURE

The solubility, diffusion coefficient, and permeability of Pd-25 Ag alloy to deuterium have been measured between 0 and 1000 psi at 300 °, 400 °, and 500 °C. Substantial deviations from ideal behavior are observed, particularly for diffusion coefficients, so that permeability cannot be represented as a simple function of pressure. After the diffusion coefficients are corrected for chemical nonideality, an additional increase by a factor of two remains in the concentration dependence of diffusivity. This is attributed to the expanded lattice of the alloy when the deuterium-to-metal ratio is high. A strain-induced shift in solubility was also observed. © 1969.