| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Accelerated Discovery and Qualification of Nuclear Materials for Energy Applications
|
| Presentation Title |
Multiscale Characterization of Defects in Ion Irradiated Ceramics for Validation of Atomistic Models |
| Author(s) |
Marat Khafizov, Vinay Chauhan, Lingfeng He, Janne Pakarinen, David Hurley |
| On-Site Speaker (Planned) |
Marat Khafizov |
| Abstract Scope |
Validation of the first principles models for microstructure evolution under irradiation has been hindered by availability of table-top experimental methods suitable for defect characterization at the atomic level. We discuss extensive characterization of defects in proton irradiated ceria. Ceria has a fluorite crystalline structure and is used a model oxide fuel system. Irradiations at 600 C to a dose of 0.1 dpa at different rates is found to provide optimal conditions for producing both point and extended defects. Electron microscopy is used to characterize dislocation loops, while optical and Raman spectroscopies are used to characterize point defects. Quantitative analysis of dislocation loops using rate equations provides means for measuring mobility of defects. Raman and optical spectroscopies probe vibrational and electronic properties of defects all tightly coupled to atomic structure. Presented methods offer an attractive solution for validation of atomistic models critical for development of material performance codes with predictive capability. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Ceramics, Nuclear Materials |