| About this Abstract |
| Meeting |
Materials in Nuclear Energy Systems (MiNES) 2021
|
| Symposium
|
Materials in Nuclear Energy Systems (MiNES) 2021
|
| Presentation Title |
Dislocation Loop Evolution in Fluorite Oxides |
| Author(s) |
Marat Khafizov, Saqeeb Adnan, Joshua Ferrigno, Kaustubh Bawane, Tiankai Yao, Miaomiao Jin, Chao Jiang, Lingfeng He, David Hurley |
| On-Site Speaker (Planned) |
Marat Khafizov |
| Abstract Scope |
We report on a combined experimental and modeling study focusing on dislocation loop evolution under irradiation in fluorite oxides. UO<sub>2</sub>, ThO<sub>2</sub> and CeO<sub>2</sub> were irradiated using a few MeV protons. Dislocation loops were characterized using transmission electron microscopy (TEM). A rate theory (RT) model is implemented to describe evolution of stoichiometric loops. Analysis of TEM results using RT model suggests that loop growth over 400-800 <sup>o</sup>C temperature range is governed by mobility of cation interstitials, whereas their nucleation is impacted by mobility of cation interstitials and anion defects. It was found that migration barrier for cation interstitials is proportional to the melting temperature of this oxides and migration barriers for other defects are consistent with atomic level simulations of defect energetics. This analysis provides a method to predict point defect concentrations, which impact the physical properties of these compounds, in particular thermal conductivity. |
| Proceedings Inclusion? |
Undecided |