To provide a hydrogen storage alloy which can occlude a large amount of hydrogen at a low temperature under a pressure within a practical range and release a large amount of the occluded hydrogen at a low temperature under the atmospheric pressure or above.
The hydrogen storage alloy comprises a Laves phase which has a composition represented by the formula: ABn (wherein A is at least either Ti or Zr; B is at least one element chosen from Cr, Fe, Co, Ni, Cu, Nb, Mo, V, Mn, and W; and 1.5<n<2.5) and has a hexagonal C14 crystal structure. Here, parameter S which represents the volume of a unit lattice and is represented by the formula: S=√3×a2×c/2(3) (wherein a and c are a- and c-axis lattice constants (), respectively) is within the range: 163<S<174.
NORITAKE TATSUO
KOJIMA YOSHITSUGU
KAWAI YASUAKI
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