Quasielastic neutron scattering study of hydrogen motion in NbC(0.71)H(0.28)

Published

March 30, 2009

Author(s)

Terrence J. Udovic, Jeremy Cook, Alexander Skripov, Reinhard Hempelmann, Andrey Rempel, Aleksandr Gusev

Abstract

In order to study the mechanism and parameters of H jump motion in the nonstoichiometric Nb carbides, we have performed quasielastic neutron scattering (QENS) measurements for NbC(0.71)H(0.28) over the temperature range 11- 475 K. Our results indicate that about 30% of H atoms in this system participate in a fast diffusive motion. The temperature dependence of the corresponding H jump rate in the range 298-475 K follows the Arrhenius law with an activation energy of 328 ± 9 meV. The Q dependence of the QENS data suggests that the observed jump motion corresponds to long-range diffusion of H atoms along chains of the off-centre sites in carbon vacancies.

Citation

Journal of Physics: Condensed Matter

Volume

21

Issue

17

Pub Type

Journals

Download Paper

https://doi.org/10.1088/0953-8984/21/17/175410

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Keywords

CARBOHYDRIDES, DIFFRACTION

Citation

Udovic, T. , Cook, J. , Skripov, A. , Hempelmann, R. , Rempel, A. and Gusev, A. (2009), Quasielastic neutron scattering study of hydrogen motion in NbC(0.71)H(0.28), Journal of Physics: Condensed Matter, [online], https://doi.org/10.1088/0953-8984/21/17/175410, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=960899 (Accessed October 10, 2025)