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 |
Heavy-ion Irradiation Induced Cation Intermixing in Lanthanide Pyrochlores |
Author(s) |
Benjamin Kyle Derby, Yogesh Sharma, Matthew Chancey, James Valdez, Matthew Schneider, Yongqiang Wang, Aiping Chen, Blas Uberuaga, Nan Li, Cortney Kreller, Matthew Janish |
On-Site Speaker (Planned) |
Benjamin Kyle Derby |
Abstract Scope |
The unique structural arrangement of cations in lanthanide pyrochlores make them interesting candidates for actinide waste disposal and ion conduction-based devices. Understanding the physical mechanisms of cation transport in these systems is important to tuning their physical properties for functional use. In this work, we interface two pyrochlores, Gd2Ti2O7, which amorphizes easily, and Gd2Zr2O7, which is radiation-tolerant, by growing a bilayer structure. Irradiating this interface using Cu4+ heavy ions at 12 MeV energy to 0.2 - 0.8 dpa induced cation intermixing across the interface. The degree of cation intermixing at the interface was measured using analytical electron microscopy, namely energy-dispersive X-ray spectroscopy. By also analyzing superlattice reflection intensities as measured by four-dimensional scanning transmission electron microscopy across the interface, the cation disorder in each pyrochlore layer was determined. This technique may offer the potential to link strain in the material to cation disorder in these pyrochlore materials. |
Proceedings Inclusion? |
Planned: |
Keywords |
Thin Films and Interfaces, Nuclear Materials, Characterization |