Absorption of hydrogen in Pd-Co and Pd-U alloys

Abstract

The absorption of hydrogen in the structurally disordered alloys Pd 95Co 5, Pd 90Co 10 and Pd 95U 5 and in the compound Pd 3U is studied experimentally by means of pressure-composition isotherms at temperatures between 300 K and 600 K and hydrogen pressures up to 50 bar. In spite of the fact that pure uranium readily absorbs hydrogen, whereas cobalt does not, the absorption of hydrogen is reduced more in the Pd-U alloys than in the Pd-Co alloys. In Pd 3U no appreciable absorption could be detected at all. This remarkable reduction of hydrogen solubility in Pd-U alloys is attributed to the filling of the palladium 4d band on alloying with uranium.