Hydrogen-absorbing alloy and nickel-metal hydride storage battery

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A hydrogen absorbing alloy is provided that is represented by the general formula Ln1-xMgxNiyAz, where : Ln is at least one element selected from the group consisting of Ca, Zr, Ti, and rare-earth elements including Y; A is at least one element selected from the group consisting of Co, Mn, V, Cr, Nb, Al, Ga, Zn, Sn, Cu, Si, P, and B; and x, y, and z satisfy the following conditions 0.05≦x≦0.25, 0

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