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Mechanochemistry and H-sorption properties of Mg2FeH6-based nanocomposites Mg2FeH6 is a promising material for hydrogen storage ap-plications, since it presents the highest known volumetric capacity of 150 kg m–3 of H2 and its metallic constituents are inexpensive. The major drawbacks for its application are the difficulties associated with its synthesis and also its high thermal stability. In this paper, Mg2FeH6-based nano-composites were prepared from the elements via reactive milling. A high-yield of the complex hydride synthesis was obtained after a systematic processing study, and the best conditions were successfully extended to the mechano-chemical synthesis of Mg2CoH5. The influence of different additives such as transition metals, transition metal fluor-ides and graphite on the H-sorption behavior of th