Abstract: Microcrystalline magnesium containing a small amount of manganese(i.e.microcrystal Mg(Mn)) has been prepared by an arc vaporization-condensation method. XRD indicated that the microcrystalline Mg(Mn) powder has a main phase of microcrystalline Mg remaining the hexagonal crystal structure. The TEM micrographs showed that some wadding was inlaid on the surface of the microcrystalline Mg and the particle size was about 100～500 nm. It exhibits high capacity for hydrogen storage(6.2％) and high speed for hydrogen desorption at 280 ℃. This characteristic is advantageous to the application of hydrogen storage.

Key words: Magnesium(Manganese), Microcrystalline, Vaporization-condensation, 　Catalysis, Hydrogen-storage