Abstract
The magnetization behavior of annealed hydrogen storage MmNi 5 − x Al x ( x = 0.4, 0.8), MmNi 5 − x Mn x ( x = 0.4, 0.8) and MmNi 4.6Sn 0.4 intermetallics has been studied. Al, Mn and Sn substitutions systematically decreased the saturation magnetization due to the filling of the 3d band of nickel by the electrons from substituted elements. The decrease in saturation magnetization is related to the lowering of hydride formation pressure of these intermetallics by the substituted elements. Al substitutions decreased whereas Mn substitutions increased the hydrogen storage capacity. The lowering of plateau pressure and increase or decrease in hydrogen storage capacity when Ni is partially substituted with Al, Mn and Sn is correlated to the changes in relative magnetic moment.
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