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  • Mechanism of the α-to-β phase transformation in the LaNi5–H2 system

    Author(s)
    Gray, E Mac A
    Blach, TP
    Pitt, MP
    Cookson, DJ
    Griffith University Author(s)
    Gray, Evan M.
    Year published
    2011
    Metadata
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    Abstract
    High-energy synchrotron in situ X-ray powder diffraction has been used to elucidate the mechanism of the hydriding phase transformation in a LaNi5 model hydrogen storage intermetallic in real time. The transformation proceeds at 10 àvia the transient growth of an interfacial phase, the ? phase, with lattice parameters intermediate between those of the a (dilute solid solution) and ߠ(concentrated hydride) phases. The ? phase forms to partially accommodate the 24% change in unit cell volume between the a and ߠphases during hydriding and dehydriding. The a, ? and ߠphases coexist at the nanoscopic level.High-energy synchrotron in situ X-ray powder diffraction has been used to elucidate the mechanism of the hydriding phase transformation in a LaNi5 model hydrogen storage intermetallic in real time. The transformation proceeds at 10 àvia the transient growth of an interfacial phase, the ? phase, with lattice parameters intermediate between those of the a (dilute solid solution) and ߠ(concentrated hydride) phases. The ? phase forms to partially accommodate the 24% change in unit cell volume between the a and ߠphases during hydriding and dehydriding. The a, ? and ߠphases coexist at the nanoscopic level.
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    Journal Title
    Journal of Alloys and Compounds
    Volume
    509
    Issue
    5
    DOI
    https://doi.org/10.1016/j.jallcom.2010.11.083
    Subject
    Condensed matter physics
    Materials engineering
    Materials engineering not elsewhere classified
    Resources engineering and extractive metallurgy
    Publication URI
    http://hdl.handle.net/10072/39850
    Collection
    • Journal articles

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