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Quasielastic neutron scattering study of hydrogen motion in C15-type TaVH

Journal of Physics Condensed Matter, ISSN: 0953-8984, Vol: 10, Issue: 8, Page: 1787-1801
1998
  • 64
    Citations
  • 0
    Usage
  • 4
    Captures
  • 0
    Mentions
  • 0
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Metrics Details

  • Citations
    64
    • Citation Indexes
      64
  • Captures
    4

Article Description

In order to clarify the mechanism of hydrogen diffusion in cubic Laves phase TaV, we have performed high-resolution quasielastic neutron scattering measurements on TaVH (x = 0.6 and 1.1) in the temperature range 10-320 K. It is found that the diffusive motion of hydrogen in this system can be described in terms of two jump processes: the fast localized H motion within hexagons formed by interstitial g (TaV) sites and the slower hopping from one hexagon to the other. This model is also supported by neutron diffraction measurements showing that the sublattice of g sites in TaVD is split into hexagons well separated from each other. The behaviour of the elastic incoherent structure factor for TaVH suggests that only a fraction of the H atoms participate in the fast localized motion, and this fraction increases with temperature. Comparison of the properties of TaVH and other Laves phase hydrides with g-site occupation shows a clear correlation between the parameters of the two jump processes and the g-g distances r (within the hexagons) and r (between different hexagons).

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