As it was already mentioned, ball milling (or, more generally, mechanical activation) is an efficient way for the increase of reactivity of magnesium hydride, particularly, towards its hydrolysis . The improvement of MgH2 hydrolysis by the mechanical activation is associated with the decrease of particles agglomeration, appearance of defects and the increase of specific surface area of the material. The mechanical activation becomes more efficient at presence of various additives to MgH2 including metal oxides and halides .