| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
High Entropy Materials: Concentrated Solid Solutions, Intermetallics, Ceramics, Functional Materials and Beyond V
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| Presentation Title |
Swift Heavy Ion-Induced Radiation Titanate Pyrochlore Oxides and Influence of Material Complexity |
| Author(s) |
George Harold Adamson, Cale Overstreet, Eric O’Quinn, Tao Liang, Haixuan Xu, Pascal Simon, Changyong Park, Veerle Keppens, Katherine Page, Maik Lang |
| On-Site Speaker (Planned) |
George Harold Adamson |
| Abstract Scope |
Recent advances in the study of compositionally complex materials have revealed desirable properties which arise from increased configurational entropy. For potential applications such as thermal barrier coatings and nuclear waste forms, these materials must operate in harsh environments and withstand extreme conditions, including intense irradiation fields. Highly energetic ions from the GSI Helmholtz Center were used to investigate the impact of compositional complexity on the radiation resilience of pyrochlore oxides. The structural evolution of two samples with comparable cationic radii, (YbTbGdErDy)2Ti2O7 and Ho2Ti2O7, was compared after irradiation with 946 MeV Au ions based on synchrotron X-ray diffraction at the Advanced Photon Source and Raman spectroscopy. Loss of crystallinity was revealed in both samples with (YbTbGdErDy)2Ti2O7 exhibiting a higher amorphization rate with ion fluence than Ho2Ti2O7. While no disordering to a defect fluorite phase was evidenced with either pyrochlore, the local structural changes with a weberite-type atomic arrangement appear very similar. |