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Meeting MS&T23: Materials Science & Technology
Symposium Emergent Materials Under Extremes and Decisive In Situ Characterizations
Presentation Title Irradiation Induced Structural and Thermal Conductivity Changes in Nuclear Fuels
Author(s) Linu Malakkal, Amey Rajendra Khanolkar, Zilong Hua, Marat Khafizov, Chris Marianetti, David Hurley
On-Site Speaker (Planned) Linu Malakkal
Abstract Scope Radiation-induced defects and dopants are known to introduce lattice distortions that influence the thermophysical properties of nuclear fuels. A fundamental understanding of their impact on fuel performance is, therefore, critical for developing advanced ceramic fuels. This talk explores the impact of small-scale lattice defects (seeded via proton irradiation) on the optical, elastic, and thermal properties of hydrothermally grown thorium dioxide (ThO2) single crystals. Changes in optical properties of the irradiated ThO2  and single crystals are measured using ellipsometry and reflectometry, respectively. Elastic property changes arising from defect-induced distortions are probed from changes in the frequency of laser-generated surface acoustic waves and longitudinal coherent acoustic phonons, respectively. The thermal conductivity changes due to the irradiation-induced defects are measured using a modulated thermo-reflectance technique. When combined with ab initio calculations, our findings provide new insight into the impact of irradiation-induced defects on the properties of advanced fuels.


Capturing Laser Induced Dynamics of Materials via Single-Shot Ultrafast Transmission Electron Microscopy
HP-XAFS and Its Application to Topological Insulator Bi2Te3
In-situ Observations of the High Temperature Melting Behaviour of Ce-brannerite
In-situ Raman Studies on Synthesis and Oxidation of UC1-xNx
In-situ/Operando Characterization of Emerging Materials with MeV Ultrafast Electron Diffraction at SLAC National Accelerator Laboratory
In Situ Characterization and Modeling of Spent UO2 Fuel under Ion Irradiation
Irradiation Induced Structural and Thermal Conductivity Changes in Nuclear Fuels
Magnetic Scattering and Spectroscopy at High Pressures at APS and APS-U
Modulation of Structure-function Motifs in Optoelectronic Metal Halides Using High Pressure
Neutron Scattering for Studying Materials Under Extreme Conditions
Perspectives of IXS and NRS Studies in the APSU Era
Polar Magnets in High-Pressure Exotic Perovskites
Pressure-induced Non-monotonic Crossover of Steady Relaxation Dynamics in a Metallic Glass
Pressure Driving Dual-layer Superconductivity in 4Hb-TaSe2 TMD
Structural Manipulation of Ceramic Materials via Extreme Conditions
Will High-entropy Carbides Be Enabling Materials for Extreme Environments?

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