The influence of the milling time on the yield of Mg2FeH6 from a two-step synthesis conducted in a custom-made reactor

► Mg2FeH6 synthesis by ball milling (MgH2 + Fe) followed by sintering is presented. ► Influence of milling time on reaction yield is presented. ► Reaction yield as high as 97% was obtained. ► It was shown that too short and too long milling may decrease reaction yield. ► Isothermal absorption of Mg + Fe mixture leads to MgH2 + Mg2FeH6 mixture formation.