Abstract
A series of ternary alloys based on LaNi 5 was prepared by substituting up to 50 at.% of gallium for nickel. X-ray powder diffraction revealed that the hexagonal structure of LaNi 5 (CaCu 5 type; space group P6/ mmm) is preserved in all ternary alloys and that the unit cell parameters increase with the gallium concentration. The alloys were exposed to hydrogen gas and the pressure–composition desorption isotherms for the alloy–hydrogen systems were determined. It was found that substitution of gallium for nickel decreases the hydrogen capacity and the hydrogen equilibrium pressure of the corresponding alloy–hydrogen system. The thermodynamic parameters of hydride formation, i.e. the entropy change, the enthalpy and the Gibbs free energy of formation were derived from desorption isotherms for those alloy–hydrogen systems that exhibit plateau pressures.
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