The hydrogen storage alloy

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PROBLEM TO BE SOLVED : To provide a CaCu5type hydrogen-storage alloy containing misch metal (Mm) in which the contents of Nd and Pr in the Mm can be made low and whose service life characteristics can be maintained. SOLUTION : As such the hydrogen-storage alloy, this alloy contains the misch metal (Mm) 90-100% of the entirety of which is occupied by La and Ce, and has the parent phase of CaCu5type crystal structure. Crystalline size (by a Lorentzian method) obtained by X-ray diffraction measurement of the hydrogen-storage alloy is larger than 466 nm and the strain (by the Lorentzian method) is 0.18 or lower. COPYRIGHT : (C)2009, JPO&INPIT