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

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A rare earth metal-nickel-base hydrogen absorbing alloy having a composition represented by the following formula (1) : (R1-xLx)(Ni1-yMy)z wherein R represents La, Ce, Pr, or Nd; L represents Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Y, Sc, Mg, or Ca; M represents Co, Al, Mn, Fe, Cu, Zr, Ti, Mo, Si, V, Cr, Nb, Hf, Ta, W, B, or C; 0.05