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Title: Anisotropic Diffusion of a Charged Tritium Interstitial in Li 2 Ti O 3 from First-Principles Calculations

Journal Article · · Physical Review Applied
 [1];  [1];  [2];  [1]
  1. Sichuan Univ., Chengdu (China)
  2. Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)

Tritium diffusion in the nuclear fusion reactor breeder material Li2TiO3 is a fundamentally important process for the tritium release kinetics. The energy barrier of tritium diffusion in Li2TiO3 was reported with a considerable uncertainty in previous experiments. Here, we perform the systematic density-functional-theory (DFT) studies for the diffusion processes of a positively-charged tritium, which is the most preferable charge state of the tritium interstitial in a single Li2TiO3 crystal. By calculating various local-diffusion minimum-energy paths, we find that the diffusion of the tritium is strongly anisotropic along different crystalline directions. The most favorable diffusion paths appear within a Li6 atomic single layer of Li2TiO3 and the corresponding DFT diffusion barrier is 0.281 eV, while the diffusion barrier for most favorable diffusion paths crossing a Li2Ti4 atomic layer is 0.868 eV.

Research Organization:
Ames Lab., Ames, IA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
11145006; 91326103; AC02-07CH111358; ACI-1548562; 2014GB125002; AC02-05CH11231
OSTI ID:
1477248
Alternate ID(s):
OSTI ID: 1464864
Report Number(s):
IS-J 9571; PRAHB2
Journal Information:
Physical Review Applied, Vol. 10, Issue 2; ISSN 2331-7019
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 10 works
Citation information provided by
Web of Science

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Isotope effect on hydrogen bond symmetrization in hydrogen and deuterium fluoride crystals by molecular dynamics simulation journal January 2019

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