Theoretical investigation of thermodynamic stability and mobility of the intrinsic point defects in Ti3AC2 (A = Si, Al)

Physical Chemistry Chemical Physics : PCCP
Jiemin WangYanchun Zhou

Abstract

Nano-laminated Ti3AC2 (A = Si, Al) are highlighted as nuclear materials for a generation IV (GIV) reactor because they show high tolerance to radiation damage and remain crystalline under irradiation of high fluence heavy ions. In this paper, the energetics of formation and migration of intrinsic point defects are predicted by density functional theory calculations. We find that the space near the A atomic plane acts as a point defect sink and can accommodate lattice disorder. The migration energy barriers of Si/Al vacancy and TiSi anti-site defects along the atomic plane A are in the range of 0.3 to 0.9 eV, indicating their high mobility and the fast recovery of Si/Al Frenkel defects and Ti-A antisite pairs after irradiation. This layered structure induced large disorder accommodation and fast defect recovery must play an important role in the micro-structural response of Ti3AC2 to irradiation.

References

Oct 15, 1996·Physical Review. B, Condensed Matter·G Kresse, J Furthmüller
Oct 28, 1996·Physical Review Letters·J P PerdewM Ernzerhof
Aug 5, 2000·Science·K E SickafusT Hartmann

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Citations

Jul 3, 2018·Physical Chemistry Chemical Physics : PCCP·Jiajia LiuLei Yang
Jan 30, 2020·Physical Chemistry Chemical Physics : PCCP·Zhengwei YanShahid Maqbool
Nov 24, 2017·Physical Chemistry Chemical Physics : PCCP·Tao HuXiaohui Wang
Aug 7, 2020·Physical Chemistry Chemical Physics : PCCP·Zhaocang MengLiang Huang
Feb 27, 2021·Physical Chemistry Chemical Physics : PCCP·Zhaocang MengLiang Huang

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