Abstract
The thermodynamic and structural properties of CeNi3.55Mn0.4Al0.3Co0.75, LaNi3.55Mn0.4Al0.3Co0.75 and their hydrides (deuterides) are compared. The isothermal curves have been measured. The lattice parameters and the occupancies of the various interstitial sites by deuterium have been determined by powder neutron diffraction. Differences between the two compounds as regards the hydrogen absorption are interpreted in terms of the different atomic radii of lanthanum and cerium. The evolution of the valence of cerium as a function of hydrogen content is discussed.
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