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Hydrogen motion in near stoichiometric yttrium dihydride at elevated temperatures

Journal Article · · Journal of Nuclear Materials
 [1];  [2];  [3];  [1];  [4];  [5];  [6]
  1. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
  2. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Idaho National Laboratory (INL), Idaho Falls, ID (United States)
  3. Univ. of Michigan, Ann Arbor, MI (United States)
  4. Idaho National Laboratory (INL), Idaho Falls, ID (United States)
  5. Sichuan Univ., Chengdu (China); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
  6. Sichuan Univ., Chengdu (China)

The high-temperature motion of hydrogen in near stoichiometric yttrium dihydride (YHx, x = 1.62 and 1.87 at.%) was investigated using incoherent quasi-elastic neutron scattering and Density Functional Theory (DFT) calculations as a function of hydrogen stoichiometry. Translational motion (diffusivity) of hydrogen in yttrium dihydride was only observed in a temperature range of 1073–1173 K under vacuum environment. Here, the hydrogen motion was found to be limited to the tetrahedral sublattice, and diffusivity of hydrogen was observed to increase with decreasing hydrogen stoichiometry. The same behavior was also supported with DFT calculations. The DFT results also indicated that certain migration paths with smaller energy barriers favored H jump resulting in higher diffusivities.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Idaho National Laboratory (INL), Idaho Falls, ID (United States)
Sponsoring Organization:
USDOE Office of Nuclear Energy (NE); USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
Grant/Contract Number:
AC05-00OR22725; AC07-05ID14517
OSTI ID:
2333848
Alternate ID(s):
OSTI ID: 2373086
Journal Information:
Journal of Nuclear Materials, Journal Name: Journal of Nuclear Materials Vol. 593; ISSN 0022-3115
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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  • Azuah, Richard Tumanjong; Kneller, Larry R.; Qiu, Yiming
  • Journal of Research of the National Institute of Standards and Technology, Vol. 114, Issue 6 https://doi.org/10.6028/jres.114.025
journal November 2009

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