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  • Neutron diffraction study of the LaNi5-D system during activation

    Author(s)
    Pitt, MP
    Gray, EM
    Kisi, EH
    Hunter, BA
    Griffith University Author(s)
    Gray, Evan M.
    Pitt, Mark P.
    Year published
    1999
    Metadata
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    Abstract
    The microstructural changes occurring during the initial absorption of deuterium by virgin LaNi5 at 40°C have been investigated using in-situ neutron powder diffraction. Rietveld profile refinement was used to determine the α and β phase proportions, lattice parameters and microstrains. In absorption, we found that in the two-phase region (i) the lattice parameters of the α and β phases were (within resolution) independent of the phase proportions; (ii) the α-phase diffraction peaks remained essentially unbroadened relative to the virgin metal; (iii) the β-phase peaks were relatively broad with the usual anisotropy of breadth. ...
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    The microstructural changes occurring during the initial absorption of deuterium by virgin LaNi5 at 40°C have been investigated using in-situ neutron powder diffraction. Rietveld profile refinement was used to determine the α and β phase proportions, lattice parameters and microstrains. In absorption, we found that in the two-phase region (i) the lattice parameters of the α and β phases were (within resolution) independent of the phase proportions; (ii) the α-phase diffraction peaks remained essentially unbroadened relative to the virgin metal; (iii) the β-phase peaks were relatively broad with the usual anisotropy of breadth. These findings imply that, as nuclei of β phase form for the first time in a particle that is wholly α phase, the lattice expansion causes pure β crystallites containing a very high density of lattice defects to fracture off the particle, i.e., decrepitate. Hence the nanoscale mixing and strong mechanical interaction between the α and β phases noted in multiply cycled material are not observed during the initial absorption of D atoms, because the lattice parameter misfit cannot be accommodated. In desorption, and subsequently, there is sufficient accommodation of the lattice parameter mismatch between the α and β phases for them to coexist in the same powder particle.
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    Journal Title
    Journal of Alloys and Compounds
    Volume
    293-295
    DOI
    https://doi.org/10.1016/S0925-8388(99)00310-2
    Subject
    Condensed matter physics
    Materials engineering
    Resources engineering and extractive metallurgy
    Publication URI
    http://hdl.handle.net/10072/122458
    Collection
    • Journal articles

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