About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
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High-Entropy Materials: Solid Solutions, Intermetallics, Ceramics, Functional Materials and Beyond VI
|
| Presentation Title |
Structural Evolution of Compositionally Complex Pyrochlore Oxides under Swift Heavy Ion Irradiation |
| Author(s) |
Kenneth Sanders, George Adamson, Cale Overstreet, Eric O'Quinn, Tao Liang, Haixuan Xu, Pascal Simon, Jesse Smith, Joerg Neuefeind, Joshua Safin, Katharine Page, David Sprouster, Maik Lang |
| On-Site Speaker (Planned) |
Kenneth Sanders |
| Abstract Scope |
Compositionally complex ceramics with multiple cations offer desirable properties that arise from increased configurational entropy. Recent studies have focused on exploring their performance in harsh environments (e.g., intense irradiation, extreme pressures, high temperatures) for potential applications such as advanced thermal barrier coatings or nuclear waste forms. Highly energetic heavy ions from the GSI Helmholtz Centre were used to irradiate a range of compositionally complex pyrochlore oxides to test their resistance to amorphization at high fluences. Structural evolution after irradiation with 946 MeV Au ions was examined using synchrotron-based X-ray characterization at the Advanced Photon Source and National Synchrotron Light Source-II, neutron total scattering at the Spallation Neutron Source, and Raman spectroscopy. The amorphization behavior of the compositionally complex pyrochlores was comparable to that of conventional endmembers, exhibiting a similar short-range ordering within the non-crystalline phase. Trends in radiation response were linked to cation variance and cation antisite defect energy. |