Hydrogen motion in C15-type ZrMo2Hx: Quasielastic neutron scattering and nuclear-magnetic-resonance studies

A. V. Skripov, J. C. Cook, Christof Karmonik, V. N. Kozhanov

Research output: Contribution to journalArticle

23 Scopus citations

Abstract

In order to determine the parameters of H motion in the cubic (C15-type) Laves phase ZrMo2, we have performed quasielastic neutron scattering measurements and nuclear-magnetic-resonance measurements of the proton spin-lattice relaxation rate on ZrMo2Hx (0.3 < x < 1.0) in the temperature range 10–430 K. The diffusive motion of hydrogen in this system can be described in terms of two jump processes: the fast localized H motion within the hexagons formed by interstitial g (Zr2Mo2) sites and the slower hopping from one hexagon to the other. The hopping rate τ-1l of the faster process is found to be of the order of 1010s-1 at 300 K. The characteristic frequency τ-1d of the slower process at the same temperature is about 6 × 107s-1. Comparison of the motional parameters of hydrogen in ZrMo2Hx with those in the related C15-type systems TaV2Hx and ZrCr2Hx shows that the value of τdl for ZrMo2Hx lies between the corresponding values for TaV2Hx and ZrCr2Hx. This is consistent with the changes in the ratio of g-g distances r1 (within the hexagons) and r2 (between different hexagons).

Original languageEnglish (US)
Pages (from-to)7238-7244
Number of pages7
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume60
Issue number10
DOIs
StatePublished - Jan 1 1999

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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