On the hydriding and dehydriding kinetics of magnesium with a titanium dioxide admixture

The paper deals with the hydriding and dehydriding kinetics at different temperatures and pressures of mixtures consisting of 90 wt% Mg and 10 wt% TiO 2 (rutile) obtained (a) by mechanical alloying in a planetary mill and (b) by the usual procedure of grinding and homogenization. It is shown that the addition of TiO 2 improves the absorption and desorption characteristics of magnesium, this effect being more pronounced in the mechanically alloyed mixture. It is established that at all temperatures the highest absorption capacity of the samples corresponds to pressures close to the equilibrium one. The possible reasons for these effects are discussed.