|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Ceramic Materials for Nuclear Energy Research and Applications
||Influence of Dose Rate and Temperature on Mass Transport in Hematite
||Kayla Yano, Sandra D Taylor, Tiffany C Kaspar, Danny J Edwards, Daniel K Schreiber
|On-Site Speaker (Planned)
In this study, mass transport pathways are directly visualized in an irradiated model iron oxide using novel isotopic tracer and characterization techniques. In nuclear reactor environments, irradiation-induced defects and elevated temperatures interact to influence mass transport. These two forces can be difficult to separate but we attempt to do so here. Isotopic tracers (e.g. 57Fe and 18O) are incorporated via molecular beam epitaxy. Irradiation dose rate and annealing temperature are varied to elucidate their role on atomic and nanostructural evolution. Complementary scanning/transmission electron microscopy and 3D atom probe tomography are used to document the microstructural changes and the diffusion of isotopic tracers in bulk and defected crystal structures. Comparisons are made of the isotopic redistribution upon either thermal annealing or argon irradiation to reveal the role of non-equilibrium point defect populations on self-diffusion coefficients. This study provides fundamental insight into mass transport mechanisms impacting material performance and degradation.
||Characterization, Nuclear Materials, Environmental Effects