About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
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Symposium
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Ceramics and Ceramic-based Composites for Nuclear Fission Applications
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Presentation Title |
Thermal Conductivity Suppression in Uranium-doped Thorium Dioxide Due to Phonon Resonant Scattering |
Author(s) |
Zilong Hua, Saqeeb Adnan, Cody Dennett, Amey Khanolkar, Karl Rickert, David Turner, Timothy Prusnick, James Matt Mann, Marat Khafizov, David Hurley |
On-Site Speaker (Planned) |
Zilong Hua |
Abstract Scope |
In this work, thermal conductivities of a series of uranium-doped thorium dioxide samples are experimentally measured using a spatial domain thermoreflectance technique in the temperature range of 77K-300K, and the results are compared to the predictions of an analytical Klemens-Callaway model (KCM). With the impacts from different phonon scattering mechanisms isolated in the analytical model, we observed that phonon resonant scattering, i.e., the lattice distortion induced by the spin of paramagnetic electrons, has a stronger impact than the Rayleigh-type point defect scattering on reducing the phonon-mediated thermal conductivity in this temperature range. Moreover, the resonant scattering intensities fitted from KCM among samples with different uranium doping percentages and pure uranium dioxide show a nonlinear correlation between thermal conductivity and doping percentage. |
Proceedings Inclusion? |
Planned: |
Keywords |
Nuclear Materials, Mechanical Properties, Characterization |