About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Transmutation Effects in Fusion Reactor Materials: Critical Challenges & Path Forward
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Presentation Title |
Stability of a Li2TiO3 Candidate Solid-breeder Material Following Li Transmutation |
Author(s) |
German Samolyuk, Philip D Edmondson, Yuri Osetskiy |
On-Site Speaker (Planned) |
German Samolyuk |
Abstract Scope |
Generation of tritium fuel in future nuclear fusion power reactors is likely to occur through transmutation driven by interactions of Li atoms with energetic neutrons. In solid-state breeder blanket concepts based around Li ceramics such as Li2TiO3, the designed transmutation of Li into tritium will result in the formation of vacancies that may degrade the material properties.
Here, we have applied first-principles density functional theory (DFT) based approaches to investigate the stability of the structure with increasing vacancy concentration as an approximation to the transmutation-induced transition from Li to tritium. The criterion for the loss of structural stability within the lattice is the presence of negative phonon frequency.
This presentation will focus on the stability of lithium metatitanate (Li2TiO3) and the results will be discussed in terms of the upper limit of 6Li enrichment of the initial breeder, and the limit on exposure/lifetime. |
Proceedings Inclusion? |
Planned: |
Keywords |
Modeling and Simulation, Ceramics, Nuclear Materials |