About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
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Symposium
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Synergistic Irradiation, Corrosion, and Microstructural Evolution in Nuclear Materials
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Presentation Title |
Defects and Disorder in Swift Heavy Ion-irradiated, Fluorite-derived Complex Oxides |
Author(s) |
Devon L. Drey, Eric O'Quinn, Will Cureton, Igor Gussev, Maik Lang |
On-Site Speaker (Planned) |
Devon L. Drey |
Abstract Scope |
Oxides that adopt the fluorite structure constitute an important class of materials in nuclear systems, in which they are subject to extreme conditions such as high temperatures, corrosive fluids, and highly ionizing radiation. Fluorite-derived oxide ceramics are used as nuclear fuels (UO2), corrosion resistant coatings (Ln-doped ZrO2), and geological nuclear wasteforms (Ln2(Zr,Ti)2O7 pyrochlore). Despite their structural simplicity, fluorite-derived oxides can accommodate atomic disorder without losing crystallinity. A thorough understanding of the defect morphology in fluorite-derived oxides is necessary for their use in next generation nuclear systems. By combining state-of-the-art swift heavy ion irradiation with advanced neutron and X-ray scattering techniques we show that defect formation in these materials is decidedly complex. The local structure of highly disordered and radiation amorphized pyrochlore is very similar despite having different long-range structures. Furthermore, radiation resistance in these materials is dependent on the structural length scale being investigated and the level of pre-existing disorder. |
Proceedings Inclusion? |
Planned: |
Keywords |
Nuclear Materials, Ceramics, Characterization |