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Hydrogen Dynamics in Ce2Fe17H5: Inelastic and Quasielastic Neutron Scattering Studies

Published

Author(s)

Alexander V. Skripov, N. V. Mushnikov, P. B. Terent'ev, V. S. Gaviko, Terrence J. Udovic, John J. Rush

Abstract

The vibrational spectrum of hydrogen and parameters of H jump motion in the rhombohedral Th2Zn17d-type compound Ce2Fe17H5 have been studied by means of inelastic and quasielastic neutron scattering. It is found that hydrogen atoms occupying interstitial Ce2Fe2 sites participate in the fast localized jump motion over the hexagons formed by these tetrahedral sites. The H jump rate τ-1 of this localized motion is found to change from 3.9x109 s-1 at Τ = 140 K to 4.9x1011 s-1 at Τ = 350 K, and the temperature dependence of τ-1 in the range (140-350) K is well described by the Arrhenius law with the activation energy of 103plus and minus}3 meV. Our results suggest that the hydrogen jump rate in Th2Zn17-type compounds strongly increases with decreasing nearest-neighbor distance between the tetrahedral sites within the hexagons. Since each such hexagon in Ce2Fe17H5 is populated by two hydrogen atoms, the jump motion of H atoms on the same hexagon should be correlated.
Citation
Journal of Physics Condensed Matter
Volume
23

Keywords

Ce2Fe17, hydrogen, hydrogen dynamics, inelastic neutron scattering, jump diffusion, localized motion, metal hydride, quasielastic neutron scattering, vibrational spectroscopy

Citation

Skripov, A. , Mushnikov, N. , Terent'ev, P. , Gaviko, V. , Udovic, T. and Rush, J. (2011), Hydrogen Dynamics in Ce<sub>2</sub>Fe<sub>17</sub>H<sub>5</sub>: Inelastic and Quasielastic Neutron Scattering Studies, Journal of Physics Condensed Matter, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=908701 (Accessed June 5, 2023)
Created September 20, 2011, Updated October 12, 2021