Abstract
Hydrogen absorption in a series of eleven rare earth ternary intermetallic compounds, RNi 4Al (where R = La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, and Tm) has been studied. All these compounds are found to crystallize in the hexagonal CaCu 5-type structure and absorb a large quantity of hydrogen at moderate pressure and ambient temperature. In terms of equilibrium pressure, the hydrides of these ternaries are more stable than those of corresponding binary, RNi 5, compounds. This is consistent with previous observations on the Th(Ni, Al) 5 ternary system.
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