Rare earth metal-nickel and its manufacturing method, a hydrogen storage alloy, a nickel-hydrogen

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A rare earth metal-nickel hydrogen storage alloy of a composition represented by the formula : RNiaMnbCocAldXe (R stands for one or more rare earth elements including Sc and Y, not less than 95 atom % of which is one or more elements selected from the group consisting of La, Ce, Pr, and Nd; X stands for one or more elements selected from the group consisting of Fe, Cu, Zn, V, and Nb; a, b, c, d, and e satisfy the relations of 3.9