| About this Abstract |
| Meeting |
MS&T22: Materials Science & Technology
|
| Symposium
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Advanced Characterization of Materials for Nuclear, Radiation, and Extreme Environments III
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| Presentation Title |
Probing Short-Range Order in Disordered Crystalline Materials for Extreme Environments
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| Author(s) |
Eric O'Quinn, Devon Drey, William Cureton, Gianguido Baldinozzi, Maik Lang |
| On-Site Speaker (Planned) |
Eric O'Quinn |
| Abstract Scope |
Structurally disordered crystalline materials are used in a variety of energy technologies from solid oxide fuel cells to nuclear fuels and waste forms. Here, we present selected examples of synergistic experimental and modeling approaches that reveal short-range order in oxide materials that appear disordered over longer length scales. Our research strategy focuses on state-of-the-art neutron total scattering experiments with the world’s most intense pulsed neutron beam, the Spallation Neutron Source (ONRL); neutrons scatter intensely from oxygen permitting analysis of anion sublattice behavior and total scattering yields pair distribution function (short-range) data. Results are presented for total scattering experiments with combined first principles and Reverse Monte Carlo modeling that revealed the short-range oxygen clustering in the nuclear fuel UO2+x. Another example illustrates the analysis of unexpected short-range order in disordered AB2O4 spinel and disordered A2B2O7 pyrochlore oxides, proposed for use in lithium battery applications, actinide transmutation matrices, and nuclear waste forms. |