First-principles study of the surface properties of γ-LiAlO2: Stability and tritium adsorption
Abstract
γ-LiAlO2 enriched with 6Li isotope exhibits excellent performance under neutron radiation and is used in tritium-producing burnable absorber rods (TPBARs) to produce tritium (T, 3H) in pressurized water reactor (PWR). Here, to better understand the 3H formation and diffusion on the surfaces, the first-principles calculations are performed to study the stability of γ-LiAlO2 surface and the 3H adsorption on the surface. By considering all possible symmetrical stoichiometric and nonstoichiometric low-index surfaces, two most stable surfaces, one stoichiometric (100) and one nonstoichiometric (101), were identified. The 3H adsorption and diffusion on the most stable (100) surface were further explored, and the obtained results show that there are four stable sites (three O and one Al atop) for 3H adsorption. The calculated Bader charges of atoms reflect that 3H adsorption on the top of O site is a reduction process, while on the top of Al site is an oxidation one. Under low adsorption coverage of 1/4 per surface unit cell, 3H atoms are adsorbed on the most stable OA atop site. With increasing 3H diffused from bulk to surface, the AlG site is the second choice for 3H adsorption, and then the OB site. The coverage of 2/4 is the mostmore »
- Authors:
-
- National Energy Technology Lab. (NETL), Pittsburgh, PA (United States)
- Chinese Academy of Sciences, Hefei (China)
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Publication Date:
- Research Org.:
- National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1582395
- Alternate Identifier(s):
- OSTI ID: 1547427
- Report Number(s):
- NETL-PUB-22174
Journal ID: ISSN 0022-3115; TRN: US2100868
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Nuclear Materials
- Additional Journal Information:
- Journal Volume: 522; Journal Issue: C; Journal ID: ISSN 0022-3115
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Jia, Ting, Zeng, Zhi, Paudel, Hari, Senor, David J., and Duan, Yuhua. First-principles study of the surface properties of γ-LiAlO2: Stability and tritium adsorption. United States: N. p., 2019.
Web. doi:10.1016/j.jnucmat.2019.05.007.
Jia, Ting, Zeng, Zhi, Paudel, Hari, Senor, David J., & Duan, Yuhua. First-principles study of the surface properties of γ-LiAlO2: Stability and tritium adsorption. United States. https://doi.org/10.1016/j.jnucmat.2019.05.007
Jia, Ting, Zeng, Zhi, Paudel, Hari, Senor, David J., and Duan, Yuhua. Tue .
"First-principles study of the surface properties of γ-LiAlO2: Stability and tritium adsorption". United States. https://doi.org/10.1016/j.jnucmat.2019.05.007. https://www.osti.gov/servlets/purl/1582395.
@article{osti_1582395,
title = {First-principles study of the surface properties of γ-LiAlO2: Stability and tritium adsorption},
author = {Jia, Ting and Zeng, Zhi and Paudel, Hari and Senor, David J. and Duan, Yuhua},
abstractNote = {γ-LiAlO2 enriched with 6Li isotope exhibits excellent performance under neutron radiation and is used in tritium-producing burnable absorber rods (TPBARs) to produce tritium (T, 3H) in pressurized water reactor (PWR). Here, to better understand the 3H formation and diffusion on the surfaces, the first-principles calculations are performed to study the stability of γ-LiAlO2 surface and the 3H adsorption on the surface. By considering all possible symmetrical stoichiometric and nonstoichiometric low-index surfaces, two most stable surfaces, one stoichiometric (100) and one nonstoichiometric (101), were identified. The 3H adsorption and diffusion on the most stable (100) surface were further explored, and the obtained results show that there are four stable sites (three O and one Al atop) for 3H adsorption. The calculated Bader charges of atoms reflect that 3H adsorption on the top of O site is a reduction process, while on the top of Al site is an oxidation one. Under low adsorption coverage of 1/4 per surface unit cell, 3H atoms are adsorbed on the most stable OA atop site. With increasing 3H diffused from bulk to surface, the AlG site is the second choice for 3H adsorption, and then the OB site. The coverage of 2/4 is the most favorable 3H adsorption state due to the counteracted charge transfer. Finally, when the coverage is up to 4/4, the interaction between 3H atoms leads to partial formation of T2 molecule that desorbs from surface. Therefore, T2 molecule should be the main product from the perfect surface of γ-LiAlO2 at high 3H coverage.},
doi = {10.1016/j.jnucmat.2019.05.007},
journal = {Journal of Nuclear Materials},
number = C,
volume = 522,
place = {United States},
year = {Tue May 07 00:00:00 EDT 2019},
month = {Tue May 07 00:00:00 EDT 2019}
}
Web of Science
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