Ca, Mg and Ni containing alloys, method for preparing the same and use thereof for gas phase hydrogen storage

摘要

Disclosed are new Ca, Mg and Ni-containing alloys of the general formula:        (Ca_c Mg_d M_e )_b ( Ni_1-zT_z)_awhere:M is at least one metal selected from the group consisting of Y, Ce, La, Pr, Nd, Th, Nd, Ti, V, Zr, Ta, Hf, Sr, Ba and Misch metals;T is at least one element selected from the group consisting of Al, Zn, Cu, Fe, Co, Mn, Cr, Mo, W, Si, Ga, Ge, In, Sn, Ag, C and B;a is an integer equal to 2 or 5:z is a number ranging from 0 to 0.5; andwhen a is equal to 2, then 0.9 ≤b≤1.1; andwhen a is equal to 5, then either 1,75 ≤b≤2.25 or 0.75≤b≤ 1.31. These alloys which are of the AB₂, A₂B₅ or AB₅ types, may be single phase or multiphase and are useful for reversibly absorbing hydrogen from a gas phase. Also disclosed is a method for preparing the above alloys.