Cooperative hydriding properties in a nanostructured Mg2Ni-H system

H. Fujii, S. Orimo, K. Ikeda

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A nanostructured Mg2Ni-H system was prepared by reactive mechanical grinding (RMG) of Mg2Ni under a H2 gas pressure of 1 MPa during various time periods from 5 to 4800 min. The structural and hydriding properties of the products obtained were examined by X-ray diffraction, thermal analysis, SEM and TEM. The experimental results showed the existence of cooperative dehydriding phenomena in intra- and inter-grain regions which have about the same volume fractions. Dehydrogenation from distorted inter-grain regions in nanostructured Mg2Ni-H prepared by RMG for 60 min occurs at the same temperature as hydrogen leaves the intra-grain region of crystalline Mg2NiH0.3. Elastic interactions in nanostructured materials are important for the understanding of such cooperative dehydriding phenomena.

Original languageEnglish
Pages (from-to)80-83
Number of pages4
JournalJournal of Alloys and Compounds
Publication statusPublished - 1997 May 20


  • Cooperative hydriding phenomena
  • Hydrogen storage
  • MgNi-H
  • Nanostructure


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