Abstract
Pressure-composition isotherms have been determined for the systems RCo/sub 3/-H and RFe/sub 3/-H, with R = Gd, Tb, Dy, and Ho, and also for ErFe/sub 3/-H. The studies show certain systematics in regard to the affinity of the alloy for hydrogen: (1) it is greater for the Fe compounds than for the corresponding Co compounds; (2) it decreases as the atomic number of R increases; (3) it increases with increased rare earth content of the compound. The systematic trends are thought to be brought on by systematic variations in the band structure produced by variations in composition and stoichiometry. The hydrogen storage capacities of the RT/sub 3/ phases (T = Fe or Co) exceed those of the RCo/sub 5/ phases and the well-known hydrogen absorber LaNi/sub 5/. The amount of hydrogen stored at pressures of 400 psi ranges from about 4 to 6 x 10/sup 22/ atoms/cm/sup 3/; some of these exceed the particle density of liquid hydrogen, 4.2 x 10/sup 22/ atoms/cm/sup 3/.
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