Kazumi Umeda, Yoshio Miyairi and Yoshikazu Makihara
Department of Mechanical and Electronic System Engineering, Graduate School of Engineering, Kyushu-Kyoritsu University, Kitakyushu 807-8585
A new composite Mg-50 mass%ZrMn2 hydride with a cooperative hydrogen absorption/desorption mechanism has been elaborated by reactive mechanical milling in a hydrogen atmosphere. The structural and hydriding properties of the composite were investigated by XRD, SEM/EDS and TG/DTA measurements. The composite absorbs hydrogen at room temperature and forms the nanostructured composite hydride composed of ZrMn2Hx, MgH2 and Mg, which discharges hydrogen around 275°C without decomposition. It is concluded that the ZrMn2 fine particles uniformly distributed for the high density on the Mg matrix play an important role in the ``cooperative mechanism'' where the hydrogen in MgH2 and ZrMn2Hx are simultaneously discharged.
hydrogen storage composite material, magnesium hydride, Laves phase zirconium-manganese compound, reactive mechanical milling, cooperative mechanism
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