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High pressure can produce a very steep increase of the chemical potential of hydrogen, resulting in a drastic enhancement of the solubility in metal. A number of transition metal hydrides have been synthesized under high-pressure conditions. As far as the platinum group metals are concerned, these metals have been generally known as highly active catalysts in metal-hydrogen systems. There has been experimentally no observation of platinum metal hydrides, except for palladium and rhodium hydrides. A theoritical calculation predicts formation of platinum metal hydrides with high concentration of hydrogen at high pressure. We investigated iridium-, platinum-, and gold-hydrogen systems at high pressure to synthesize metal hydrides. In platinum-hydrogen system, a pressure-induced structural phase transition of face-center-cubic phase into hexagonal-close-packing + tetragonal phases was observed at 24-25 GPa by in situ X-ray study. The volumes of new phases are likely to propose the formation of platinum hydrides. In other systems, no formation of metal hydrides was observed up to 30 and 40 GPa, respectively.

Pressure-induced structural transition in rare earth metal hydrides