Microstructures and Their Stability of Ion-implanted Energy and Storage Materials
EMSL Project ID
44713
Abstract
Two parallel studies, respectively funded by Office of Basic Energy Sciences and Office of Nuclear Energy, U.S. Department of Energy, will be performed under this user proposal. The objectives of the research efforts are to advance a fundamental understanding of radiation effects in nanostructured materials and to explore nuclear waste forms for long-term storage or permanent disposal. Both studies integrate experimental and computational approaches to tackle scientific issues associated with formation and evolution of microstructures and their stability under extreme conditions (high radiation, high temperature, etc.).For nanostructured materials, including carbides (SiC/SiC, SiC/Si, SiC/C, etc.) and oxides (ZrO2/SiO2, ZrO2/Al2O3, etc.), studies will be focused on the interfacial roles that govern the microstructural evolution and phase transformation (amorphization or crystallization) under ion irradiation. Scientific issues to be addressed in this study include: What are the separate and combined roles of the electronic and nuclear energy deposition in modifying crystalline particle interfaces? What is the behavior of homogeneous and heterogeneous interfaces between nanoparticles and host matrices under irradiation? What are the effects of particle composition, size, microstructure, point-defect mobility and impurities on irradiation-induced interfacial reconstruction and defect accumulation in the interior? What are the dose rate and temperature effects? And how does irradiation-induced crystallization compete with disordering at the interface along different crystallographic orientations?
For the study of nuclear waste forms, the effects of chemical change and charge imbalance induced by radionuclide decays on model waste form structures will be investigated. Specifically, the focus will be on the structural changes induced by the decays of 90Sr2+ and 137Cs+ in surrogate non-radioactive ceramic materials. Model systems, including SrTiO3 and CsAlSi2O6, will be used for ion implantation and characterization. The structural stability of new phases will provide necessary information for rational designs of advanced waste forms tailored to mitigate the chemical change and charge imbalance that occur from the radioactive decays.
A new or improved understanding of phase transformation and structural evolution at interfaces under ion irradiation will be gained. Exploration of nuclear waste forms will provide underpinning physical and chemical sciences for the formation of new crystalline phases and their stability under extreme conditions. The outcome of work is expected to have a significant impact on the structural materials for designs of future nuclear energy systems and radiation detection and monitoring devices, and for effective management of spent fuels for permanent disposal. Both research efforts are critical to DOE priorities and EMSL missions for discovery of energy materials and technological innovation for protection of environments.
Project Details
Project type
Large-Scale EMSL Research
Start Date
2011-10-01
End Date
2014-09-30
Status
Closed
Released Data Link
Team
Principal Investigator
Team Members
Related Publications
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