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Hydrogen Motion In Lanthanum Hydrides By Means Of Quasielastic Neutron Scattering

  • C. Karmonik (a1), T. J. Udovic (a1) and J. J. Rush (a1)

Abstract

The hydrogen dynamics in LaHx was studied for different concentrations x ≥ 2.5 at different temperatures by quasielastic neutron scattering. The neutron spectra show the existence of both long-range translational diffusion and localized motion. The prefactor of the jump rate for the first process exhibits a maximum around x= 2.75. The radius for the second motion is in agreement with neutron powder diffraction measurements which support a localized motion of H confined in an octahedral site.

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1. Huiberts, J. N., Criessen, R., Rector, J. H., Wijngaarden, R. J., Dekker, J. P., deGroot, D.G. and Koeman, N. J., Nature 380, 231 (1996).
2. Udovic, T. J., Huang, Q. and Rush, J. J., J. Solid State Chem. 122, 151 (1996).
3. Udovic, T. J., Rush, J. J. and Anderson, I. S., J. Phys.: Condens. Matter 7, 7005 (1995).
4. Karmonik, C., Udovic, T. J., Rush, J. J., to be published.
5. Bee, M., Quasielastic Neutron Scattering, (Adam Hilger, Bristol and Philadelphia, 1988).
6. Udovic, T. J., Rush, J. J. Huang, Q., Anderson, I. S., J. Alloys Comp. 253–254, 241 (1997).
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Hydrogen Motion In Lanthanum Hydrides By Means Of Quasielastic Neutron Scattering

  • C. Karmonik (a1), T. J. Udovic (a1) and J. J. Rush (a1)

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