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The effect of Mo on the morphology,crystal structure and hydrogen sorption properties of Mg/C composites prepared by reactive milling was studied.Transmission electron microscopic (TEM) observation shows that Mg/C composites prepared with the addition of Mo are of nanoscale with particle size about 20-120 nm after 3 h of milling under 1 MPa H2.MgH2 oftetrahedral crystal structure predominates in the materials with the geometric shape of oblique hexagonal prism.From X-ray diffraction (XRD) and hydrogen content studies,Mo and crystallitic carbon have a synergistic effect on promoting the hydrogenation rate in the reactive milling process.From differential scanning calorimetric (DSC) studies,the dehydrogenation peak temperature of the Mg/C materials with Mo is lowered to 299-340 ℃.