Microstructure of ball milled MgH2 powders upon hydrogen cycling: An electron microscopy study

B. Paik, A. Walton, V. Mann, D. Book, I. P. Jones, I. R. Harris

    Research output: Contribution to journalArticle

    22 Citations (Scopus)

    Abstract

    Microstructure of MgH2 powder particles milled for 5-60 h was studied after the powders were hydrogen cycled. Using electron microscopy we estimated individual grain size and particle size of cycled powders to compare with those before H-cycling. The nano-size grains were found to grow (3-10 times) whereas the particles undergo a mild refinement upon H-cycling. The most prominent grain growth was within the 1st dehydrogenation. The smaller grains in the milled powders demonstrated faster growth upon cycling. The average grain size estimated in this study for the cycled powders were >200 nm. The grain and particle size approached a regular or log-normal distribution with cycling. The lattice strain introduced in the milled MgH2 powders was significantly removed by cycling for less milled powders (milled for <15 h). Longer milled (30-60 h) MgH2 powders could not fully recover from lattice strain by H-cycles (six cycles) as observed in the present study.

    Original languageEnglish
    Pages (from-to)9012-9020
    Number of pages9
    JournalInternational Journal of Hydrogen Energy
    Volume35
    Issue number17
    DOIs
    Publication statusPublished - 2010 Sep 1

    Keywords

    • Ball milling
    • Electron microscopy
    • Hydrogen cycle
    • Hydrogen energy
    • Magnesium hydride
    • Microstructure

    ASJC Scopus subject areas

    • Renewable Energy, Sustainability and the Environment
    • Fuel Technology
    • Condensed Matter Physics
    • Energy Engineering and Power Technology

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