Published April 29, 2009
| Version v1
Journal article
Quasielastic neutron scattering study of hydrogen motion in NbC0.71H0.28
- 1. Institute of Metal Physics, Ural Division of the Russian Academy of Sciences, Ekaterinburg 620041 (Russian Federation)
- 2. NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD 20899-6102 (United States)
- 3. Institut fuer Physikalische Chemie, Universitaet des Saarlandes, D-66041 Saarbruecken (Germany)
- 4. Institute of Solid State Chemistry, Ural Division of the Russian Academy of Sciences, Ekaterinburg 620041 (Russian Federation)
Description
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 NbC0.71H0.28 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.
Availability note (English)
Available from http://dx.doi.org/10.1088/0953-8984/21/17/175410Additional details
Identifiers
- DOI
- 10.1088/0953-8984/21/17/175410;
- PII
- S0953-8984(09)06040-8;
Publishing Information
- Journal Title
- Journal of Physics. Condensed Matter
- Journal Volume
- 21
- Journal Issue
- 17
- Journal Page Range
- [5 p.]
- ISSN
- 0953-8984
- CODEN
- JCOMEL
INIS
- Country of Publication
- United Kingdom
- Country of Input or Organization
- International Atomic Energy Agency (IAEA)
- INIS RN
- 41028428
- Subject category
- S36: MATERIALS SCIENCE;
- Descriptors DEI
- ACTIVATION ENERGY; ATOMS; CARBIDES; CARBON; CARBON COMPOUNDS; CHAINS; DIFFUSION; HYDROGEN; HYDROGEN COMPOUNDS; NEUTRON REACTIONS; NEUTRONS; NIOBIUM CARBIDES; NIOBIUM COMPOUNDS; PARTICLE MOBILITY; QUASI-ELASTIC SCATTERING; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE; VACANCIES
- Descriptors DEC
- BARYON REACTIONS; BARYONS; CARBIDES; CARBON COMPOUNDS; CRYSTAL DEFECTS; CRYSTAL STRUCTURE; DIRECT REACTIONS; ELEMENTARY PARTICLES; ELEMENTS; ENERGY; FERMIONS; HADRON REACTIONS; HADRONS; MOBILITY; NIOBIUM COMPOUNDS; NONMETALS; NUCLEAR REACTIONS; NUCLEON REACTIONS; NUCLEONS; POINT DEFECTS; QUASI-FREE REACTIONS; REFRACTORY METAL COMPOUNDS; SCATTERING; TRANSITION ELEMENT COMPOUNDS