Abstract
Mg 2Ni and the mixed system Mg-Mg 2Ni are used as hydrogen storage media for industrial applications. The mechanism of hydrogen charge and discharge in Mg-Mg 2Ni is not yet completely understood particularly because the kinetics of hydrogen exchange in magnesium are strongly influenced by the Mg 2Ni phase. In order to investigate hydrogen exchange in Mg-Mg 2Ni the diffusion constants of hydrogen in both systems have been investigated separately using a quasi-elastic neutron scattering technique with a high resolution backscattering spectrometer. The results show that the diffusion of hydrogen in the α phase of Mg 2Ni occurs more slowly than in the α phase of magnesium, so that the fast kinetics of hydrogen exchange in the combined system Mg-Mg 2Ni are probably influenced by surface effects. The diffusion rate in the β phase of magnesium is smaller by three orders of magnitude than that in the α phase.
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