Abstract: Hydrogen absorbing ZrMn2 alloys having MgZn2-type Laves phase structure with its Mn partially substituted by Co and containing Al as an additive and having the composition Zr(Mn1-=xCox)y Alz;Hydrogen absorbing ZrMn2 alloys having MgZn2-type Laves-phase structure with its Mn partially substituted by Co and Zr partially substituted Zr1-wTiw(Mn1-xCox)y Alz; andHydrogen absorbing alloys formed from ZrMn2 alloy having MgZn2-type Laves-phase structure or from a multicomponent alloy made therefrom by partially substituting the Zr and Mn with some other element, by further adding thereto at least one element or rare earth, Ca, and Mg.

Abstract: A metal hydride container, comprising a heat pipe of annular cross section, a metal hydride filling the central cavity of said heat pipe, closure members serving to close the openings at the opposite ends of said central cavity, a hydrogen passage tube possessed of a shut-off valve and fitted into an aperture formed in one of said closure members and communicated with the cavity of the heat pipe through a partition member pervious to hydrogen gas and impervious to said metal hydride; and a metal hydride heat storage system comprising at least one metal hydride container above-mentioned, which is useful for storing solar heat and waste heat.

Abstract: A metal hydride container, comprising a heat pipe of annular cross section, a metal hydride filling the central cavity of said heat pipe, closure members serving to close the openings at the opposite ends of said central cavity, a hydrogen passage tube possessed of a shut-off valve and fitted into an aperture formed in one of said closure members and communicated with the cavity of the heat pipe through a partition member pervious to hydrogen gas and impervious to said metal hydride; and a metal hydride heat storage system comprising at least one metal hydride container abovementioned, which is useful for storing solar heat and waste heat.