About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Neutron and X-ray Scattering in Materials Science
|
| Presentation Title |
Pyrochlore as Potential Nuclear Waste Form – Structure-property Insights from Scattering Experiments |
| Author(s) |
Sarah C. Finkeldei, Maik Lang, Gordon Thorogood |
| On-Site Speaker (Planned) |
Sarah C. Finkeldei |
| Abstract Scope |
Pyrochlore oxides (A2B2O7, with B = Zr, Ti) are considered as potential nuclear waste forms. The immobilization of radionuclides, e.g. Pu, can lead to non-stoichiometric pyrochlores that can undergo order-disorder phase transformations into defect fluorite structures due to the chemical substitutions as well as response to self-irradiation. Synchrotron X-ray scattering was utilized to gain insights into the structural response of radionuclide immobilization. X-ray diffraction data enable insights into the long-range structure, which was complemented by short-range order analysis via pair distribution functions. Self-irradiation was mimicked by Helium irradiation of zirconate and titanate pyrochlores. The different irradiation response of these two potential waste forms was analyzed by a combination of X-ray and neutron diffraction as well as transmission electron microscopy and electron backscattering diffraction. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Nuclear Materials, Phase Transformations |