Diffusion of Hydrogen in Copper-Palladium Alloys

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Abstract
The diffusion of hydrogen in copper‐palladium alloys has been studied by utilizing the dependence of electrical resistivity upon hydrogen concentration—a technique both rapid and simple. At 25°C the diffusion coefficient in the range 0–58 at.% Cu is relatively insensitive to alloy composition but is extremely sensitive to the α‐β phase change: it increases two orders of magnitude to become 5×10−5 cm2/sec when the crystal structure of the alloy system changes from face‐centered cubic to ordered body‐centered cubic. Measurements at 130°C indicate that this large increase is due to a decrease by a factor of three in the activation energy for diffusion. The ratio of the diffusion coefficient for hydrogen to that for deuterium in the body‐centered cubic alloy was found to be approximately 1.5.

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