The hydrogen storage alloy and secondary battery

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PROBLEM TO BE SOLVED : To provide a hydrogen storage alloy having a considerably improved desorbing property of occluded gaseous hydrogen as well as capacity to occlude the large amt. of the gaseous hydrogen and to provide a metal oxide-hydrogen secondary battery having a high capacity and excellent in a charge-discharge cycle. SOLUTION : This hydrogen storage alloy has a compsn. represented by the formula : MgaR1-a-bTb(Ni1-xMx)z (where R is at least one element selected from rare earth elements including Y, T is at least one element selected from Ca, Ti, Zr and Hf, M is at least one element selected from Co, Mn, Fe, Al, Ga, Zn, C, Sn, Cu, Si, B, Nb, W, Mo, V, Cr, Ta, P and S, 0.2<=a<=0.35, 0<=b<=0.3, 0<=x<=0.6 and 3<=z<=3.8). In the alloy, grains contg. a parallel growth structure are present. Further, the metal oxide-hydrogen secondary battery uses the hydrogen storage alloy as a negative electrode.