Measurements were made of the transient and steady-state permeation rates of D through a membrane. Time-lag technique yielded diffusion data (tables 137 and 138). Substantial deviations from ideal behavior were observed in the diffusion coefficients, so that the permeability could not be represented as being a simple function of pressure. When the diffusion coefficients were corrected for chemical non-ideality, an additional increase of a factor of 2 remained in the concentration dependence of the diffusivity. This was attributed to the expanded state of the lattice when the D/metal ratio was high.

Diffusion and Permeation of Deuterium in Palladium-Silver at High Temperature and Pressure. R.G.Hickman: Journal of the Less-Common Metals, 1969, 19[4], 369-83

Table 140

Diffusivity of H in Pd-Ag-Au