Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/111930
Title: Hydrogen Dynamics in the Hexagonal Ho2Fe17H4 and Y2Fe17H4.2: Inelastic and Quasielastic Neutron Scattering Studies
Authors: Skripov, A. V.
Isnard, O.
Mushnikov, N. V.
Terent'ev, P. B.
Gaviko, V. S.
Udovic, T. J.
Issue Date: 2017
Publisher: Elsevier Ltd
Elsevier BV
Citation: Hydrogen Dynamics in the Hexagonal Ho2Fe17H4 and Y2Fe17H4.2: Inelastic and Quasielastic Neutron Scattering Studies / A. V. Skripov, O. Isnard, N. V. Mushnikov et al. // Journal of Alloys and Compounds. — 2017. — Vol. 720. — P. 277-283.
Abstract: The vibrational spectra of hydrogen and the parameters of H jump motion in the hexagonal Th2Ni17-type compounds Ho2Fe17H4 and Y2Fe17H4.2 have been studied by means of inelastic and quasielastic neutron scattering. It is found that hydrogen atoms occupying interstitial Ho(Y)2Fe2 sites in both compounds participate in the fast localized jump motion over the hexagons formed by these tetrahedral sites. The temperature dependence of the H jump rate is well described by the Arrhenius law over wide T ranges (100–340 K for Ho2Fe17H4 and 140–360 K for Y2Fe17H4.2) with the activation energies of 54 (4) meV and 84 (7) meV, respectively. For Ho2Fe17H4, the localized hydrogen jump motion is found to be the fastest among all R2Fe17 hydrides studied so far. At room temperature, the H jump rate in Ho2Fe17H4 derived from our quasielastic neutron scattering data reaches 6.4 × 1011 s−1. © 2017 Elsevier B.V.
Keywords: DIFFUSION
INELASTIC NEUTRON SCATTERING
METAL HYDRIDES
ACTIVATION ENERGY
ATOMS
DIFFUSION
HYDRIDES
HYDROGEN
INELASTIC NEUTRON SCATTERING
NEUTRON SCATTERING
TEMPERATURE DISTRIBUTION
ARRHENIUS LAW
HYDROGEN ATOMS
HYDROGEN DYNAMICS
JUMP RATE
METAL HYDRIDES
QUASI ELASTIC NEUTRON SCATTERING
TEMPERATURE DEPENDENCE
TETRAHEDRAL SITES
IRON COMPOUNDS
URI: http://hdl.handle.net/10995/111930
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85019754961
PURE ID: 1814880
ISSN: 0925-8388
metadata.dc.description.sponsorship: This work was performed within the assignment of the Russian Federal Agency of Scientific Organizations (program "Spin" No. 012014633). The authors acknowledge support from the Ural Branch of the Russian Academy of Sciences under grant No. 15-9-2-9. AVS gratefully acknowledges financial support from the NIST Center for Neutron Research. This work utilized facilities supported in part by the National Science Foundation under Agreement No. DMR-0944772.
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