About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Advanced Characterization of Materials for Nuclear, Radiation, and Extreme Environments VI
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| Presentation Title |
Radiation-Induced Amorphization in WO₃ and MoO₃: Structural Response |
| Author(s) |
Katherine Parker-Repsher, Cale Overstreet, Maik Lang, Eric O'Quinn |
| On-Site Speaker (Planned) |
Katherine Parker-Repsher |
| Abstract Scope |
A major challenge in developing advanced energy systems is designing materials that remain stable under extreme conditions, such as intense radiation fields. This study investigates the structural response of orthorhombic tungsten trioxide (WO₃) and monoclinic molybdenum trioxide (MoO₃) to 1.1 GeV Au ion irradiation performed at the GSI Helmholtz Center. Post-irradiation analysis using synchrotron X-ray diffraction (Advanced Photon Source) and Raman spectroscopy reveals that both materials readily undergo amorphization. MoO₃ is less amorphization resistant compared to WO₃, which retained partial crystallinity to higher fluences. Peak fitting and deconvolution of the diffraction data enabled quantitative analysis of the amorphization process. Describing the fluence-dependent amorphous phase fractions with different track-overlap models (direct-impact versus multi-impact) suggests distinct amorphization mechanisms in both materials, potentially related to the initial crystal symmetry. This research contributes to an improved understanding of ion-matter interactions and shows that radiation effects in simple oxides can differ significantly as most compounds (e.g., ZrO2 and Ln2O3 sesquioxides) undergo an ion-beam induced crystalline-to-crystalline phase transition. |