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Platinum Metals Rev., 1988, 32, (2), 83

Hydrogen in Amorphous Palladium Alloys

  • F.A.L.

Substantial capacities for absorption of hydrogen by palladium and many palladium alloys, combined with high internal rates of hydrogen permeation, continue to provide attractive backgrounds for experimental study.

An additional valuable property is a retention of ductility on hydrogen absorption, which contrasts with undesirable embrittling effects produced by hydrogen in many metallic and also amorphous materials. Altogether these factors have latterly encouraged substantial research into absorption of hydrogen by glassy palladium-silicon alloys.

Two recent papers in J. Less-Common Met., 1988, 138, (2), 323–336 and 337–348 by A. Magnouche, R. Fromageau and J. Hillairet, and by R. Fromageau, A. Magnouche, G. Brebec and J. Hillairet, respectively, report a substantial body of further information concerning hydrogen in Pd86Si14, Pd82 Si18 and Pd80 Si20 amorphous alloys. The first concerns derivation of p-c-T relationships, at pressures up to 12 MPa and temperatures up to 200°C, and derived thermodynamic parameters. In the second paper ductile characteristics have allowed electrical resistivity to be utilised for studying the kinetics of hydrogen absorption and desorption, and the derivation of hydrogen mobilities. Indications of hydrogen diffusion coefficient increases with increasing hydrogen content have been interpreted as substantiating conclusions from the p-c-T relationships of differing types of interstitial hydrogen sites in the glassy structures, and of mutual repulsions of interstitial hydrogens.