HYDROGEN STORAGE ALLOY

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PROBLEM TO BE SOLVED : To provide a new hydrogen storage alloy excellent in corrosion resistance. SOLUTION : The hydrogen storage alloy contains Al and is composed of CaCu5 type crystal structure having a space group of International table number 191(P6/mmm). A Beq ratio (2c/3g) as a ratio of a thermal vibration parameter Beq (2c) at a 2c site to a thermal vibration parameter Beq (3g) at a 3g site is 1.4-10.0 in the crystal structure analysis of the hydrogen storage alloy. The hydrogen storage alloy can be shown by general formula MmNiaMnbAlcCod (in the expression, Mm is misch metal, and a+b+c+d>5) or general formula MmNiaMnbAlcCodMe (in the expression, M is one or more elements in the transition metals except Ni. Mn, Al and Co, and a+b+c+d+e>5). COPYRIGHT : (C)2012, JPO&INPIT