About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
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Neutron and X-ray Scattering in Materials Science
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Presentation Title |
Characterization of Heterogeneously Disordered Oxides with Total Scattering Experiments |
Author(s) |
Eric O'Quinn, Igor Gussev, Maik Lang |
On-Site Speaker (Planned) |
Eric O'Quinn |
Abstract Scope |
Oxides used in many energy technologies must operate under various extremes (e.g., irradiation and high temperature). Improving their performance or developing more robust materials require detailed understanding of induced structural changes under these conditions across all length scales. We present results from X-ray and neutron total scattering experiments, revealing that disorder is in some oxides more complex than previously thought, with atomic arrangements that exhibit a high degree of order. Disordering proceeds heterogeneously with distinct structural changes at the atomic scale and longer length scales. This behavior appears to be more general and can be understood as extension of Pauling’s rules to disordered materials, as demonstrated with data from spinel (AB2O4), weberite-type (A3BO7), and pyrochlore (A2B2O7) oxides. Disorder was induced by various means, including far-from-equilibrium processing, such as exposure to highly ionizing radiation. Our results provide an improved framework by which order-disorder transformations and associated atomic arrangements can be described. |
Proceedings Inclusion? |
Planned: |
Keywords |
Characterization, Nuclear Materials, Ceramics |