Experimental and theoretical results were presented for D transport through membranes at temperatures of 600 to 700K, and upstream D pressures of 0.027 to 0.00067Pa. A new technique for analyzing experimental flux measurements and for calculating the effective permeation and sticking coefficients during such experiments were also presented. At very low pressures, the transport was limited by molecular adsorption on the Pd surface. The sticking coefficient for this adsorption was given by:

log[] = -0.676 - 0.0021(T-273)

At higher upstream pressures, the permeability in Zr limited the transport according to:

P(mol/m s Pa½) = 2 x 10-6exp[59/T]

These permeability values were slightly higher than the predicted values. No evidence was found for the additional transport resistance which was caused by Zr surface oxidation, or by Zr/Pd interface effects.

R.E.Buxbaum, P.C.Hsu: Journal of Nuclear Materials, 1992, 189[2], 183-92

Table 236

Migration Energies of H Isotopes

in Pd-Ag Alloys at 40 to 60K

Table 237

Diffusivity Parameters for Hydrogen in Pd-Er Alloys