Abstract
AbstractThe diffusion of hydrogen in the cubic Laves‐phase hydride ZrV2Hx with 0.5 ≦ x ≦ 4.8 has been intensively studied by means of quasielastic neutron scattering using the newly built high resolution backscattering spectrometer at the FRJ‐2 reactor in Jülich. A remarkable feature of this hydride is its phase diagram: by means of differential thermoanalysis we determined the stability range of ordered hydride phases; above 320 K the homogeneous α‐solubility‐phase extends over the whole concentration range. Therefore this system offers the possibility to study the concentration dependence of the H‐diffusion over a wide range not being disturbed by phase transitions. The tracer diffusion coefficient increases with concentration possibly due to the occupation of interstitial sites of different site energy. At low hydrogen concentration we found evidence for a localized motion of hydrogen in the metal host lattice.
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