|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Ceramic Materials for Nuclear Energy Research and Applications
||Impact of Dislocation Loops on Thermal Conductivity of CeO2
||Marat Khafizov, Lingfeng He, Miaomiao Jin, David Hurley
|On-Site Speaker (Planned)
Dislocation loops are formed when ceramic materials are irradiated with energetic particles. They influence microstructure evolution and impact a number of physical properties determining physical behavior of ceramics in nuclear energy systems. Experimental measurement of thermal conductivity in proton irradiated ceria suggest that (111) faulted loops have a dramatic impact on thermal conductivity. Phonon mediated thermal transport analysis shows that the impact of individual interstitials making up the faulted loop on thermal conductivity is smaller than when they are a part of a faulted loop. This is in contrast to a general understanding that defect clustering leads to a recovery of thermal conductivity as the scattering strength of phonons by larger clusters is weaker. This effect was attributed to a long-range strain field around the faulted loops. Molecular dynamics simulations are performed to analyze the impact of (110) perfect and (111) faulted loops in fluorite structure using Green-Kubo approach.
||Nuclear Materials, Ceramics, Characterization