Abstract
The pressure-composition isotherms and relevant crystallographic, thermodynamic, and kinetic parameters are presented and discussed for the Zr 1− x Ti x CrFe y H 2 system with x = 0.1, 0.3 and y = 1.2–1.4. The hyperstoichiometric iron was observed to have a profound effect on the equilibrium dissociation pressure, elevating the plateau pressure several times over that for the corresponding Zr 1− x Ti x CrFe hydride. The hydrogen capacities of these quaternary intermetallics are quite high, the volumetric capacity being 1.21 to 1.32 with respect to that of liquid hydrogen, the weight capacity 159.9–178.9 cm 3 H 2/g alloy. The enthalpies and entropies of dissociation are in the range 27.3–31.1 kJ/mole H 2 and 100–107.2 J/K mole H 2, respectively. The dehydrogenation process was found to follow first-order kinetics with an activation energy 43.4 kJ/mole H 2. The diffusion of atomic hydrogen was considered to be the rate-determining step.
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