HYDROGEN AND DEUTERIUM IN PD-25 PCT AG ALLOY - PERMEATION, DIFFUSION,SOLUBILIZATION, AND SURFACE-REACTION

In this work, the hydrogen and deuterium transport parameters such as permeability, diffusivity, and solubility in a Pd-25 pet Ag alloy are studied, using a permeation gas phase technique and, additionally, a c omputer-controlled microbalance system. In the region in which Sievert s' law is valid, the hydrogen solubilities found using both techniques are in very good agreement. From permeation measurements, the surface constants for the adsorption (sigma k(1)) and release (sigma k(2)) of hydrogen and deuterium in Pd-25 pet Ag alloy are also determined. The measurements cover the temperature range from 323 to 773 K and a pres sure range from 1 to 10(5) Pa.