Abstract
The vibrational spectrum of hydrogen and the parameters of H jump motion in the C15-type compound YFe2H2.6 have been studied by means of inelastic and quasielastic neutron scattering. It is found that hydrogen atoms occupying tetrahedral interstitial g (Y2Fe2) sites participate in the fast localized jump motion. The behavior of the elastic incoherent structure factor as a function of momentum transfer (measured up to Qmax≈4Å−1) is consistent with the two-site motion of H atoms within pairs of closely spaced g sites. In the studied T range of 140–390K, the temperature dependence of the jump rate of this localized motion is found to be non-Arrhenius; however, it can be described by two Arrhenius-like terms with the activation energies of 42 and 10meV in the ranges 295–390K and 140–240K, respectively. Our results also indicate that hydrogen dynamics in YFe2H2.6 is affected by considerable local lattice distortions resulting from hydrogenation of YFe2.
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