Anisotropic Diffusion of a Charged Tritium Interstitial in from First-Principles Calculations
- Sichuan Univ., Chengdu (China)
- 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
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journal | January 2019 |
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