| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Thermal Transport in Crystalline and Non-crystalline Solids: Theory and Experiments
|
| Presentation Title |
Impact of Irradiation Induced Nanoscale Defects on Optical and Thermal Properties of Cerium Dioxide |
| Author(s) |
Vinay Singh Chauhan, Lingfeng He, Janne Pakarinen, David Hurley, Marat Khafizov |
| On-Site Speaker (Planned) |
Vinay Singh Chauhan |
| Abstract Scope |
Thermal conductivity is a critical physical property of ceramic materials such as oxides of uranium and thorium which are used as nuclear fuels. In this study, we use cerium dioxide as a surrogate material to study the impact of irradiation damage on thermal transport properties of nuclear fuels. Polycrystalline ceria samples were irradiated at 600 ºC at the same dose but different rates using 2 MeV protons. Thermal conductivity measured using modulated thermoreflectance approach showed a notable reduction in irradiated samples and was correlated to defects revealed by microstructure characterization. Lattice expansion detected using X-ray diffraction and Raman spectroscopy analysis were used to quantify point defects while the dislocation loops were characterized using transmission electron microscope. The changes in thermal conductivity were analyzed using a phonon-mediated thermal transport model to identify defect type responsible for these observed reduction. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |