Abstract
Time dependence of total amount of hydrogen desorbed from hydrogen-charged Mg and eutectic Mg-Mg₂Ni (23.5 wt. % Ni) alloy was measured at temperatures from interval 552 – 723 K. Experiments were carried out well below the equilibrium pressure, where these hydrides – perspective as solid hydrogen storage media – are unstable and the desorption process is controlled mainly by diffusion of hydrogen in respective hydride (MgH₂ and/or Mg₂NiH₄). Hydrogen diffusion coefficients were evaluated from desorption curves and hydrogen diffusion coefficient along interphase boundary MgH₂/Mg₂NiH₄ was estimated from results obtained with the eutectic alloy.

Key words
intermetallic phases, magnesium, magnesium alloys, diffusion, hydrogen diffusion, hydrogen storage

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