Substantially Disordered Palladium Alloy-Hydrogen Systems

The solution of hydrogen in palladium-rich substitutional alloys has been of continuing inter-est since the pioneering studies of Thomas Graham on palladium-silver alloys, in the nine-teenth century. The various palladium alloys exhibit different characteristics of hydrogen absorption compared with palladium (1, 2). Graham demonstrated considerable prescience in selecting the palladium-silver alloy system for his investigation of hydrogen absorption by a palla-dium alloy, since this alloy has subsequently proven to be the alloy of most interest. A comprehensive account of the solubility of hydrogen in ordered and disordered alloys of pal-ladium is now presented, and the results are inter-preted where possible