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Meeting 2021 TMS Annual Meeting & Exhibition
Symposium Thermal Property Characterization, Modeling, and Theory in Extreme Environments
Presentation Title Thermal Conductivity Degradation from Irradiation-induced Microstructural Defects in Single Crystal Thorium Dioxide
Author(s) Amey Rajendra Khanolkar, Zilong Hua, Cody Andrew Dennett, Marat Khafizov, Tiankai Yao, Kaustubh Bawane, Lingfeng He, J. Matthew Mann, Anter El-Azab, Jian Gan, David Hurley
On-Site Speaker (Planned) Amey Rajendra Khanolkar
Abstract Scope A fundamental understanding of radiation effects on thermal transport is critical for the development of advanced nuclear fuels. In this talk, ion irradiation is used to seed atomic-to-nanoscale defects of controllable size and density in single crystal thorium dioxide (ThO2). The influence of these microstructural defects on the thermal properties of ThO2 is explored. Lattice defects are characterized using optical spectroscopy and transmission electron microscopy. Mesoscale measurements of thermal transport properties within the damaged region are performed using a laser-based modulated thermoreflectance technique. Measurements as a function of dose and temperature are analyzed using the classical Klemens-Callaway approach, to determine the impact of point and extended defect types on the thermal properties of ThO2. These results will provide further insight into the role of irradiation-induced defects in limiting phonon-mediated thermal transport in ceramics, and enable validation of model predictions based on the Boltzmann transport formalism
Proceedings Inclusion? Planned:


First-principles Modeling of High Temperature Irradiation Resistant Thermocouple (HTIR-TC) Performance and Oxidation
A Thermodynamically-consistent Model for Heat Transport in Heterogeneous Solids
An Experimentally Validated Mesoscale Model for the Effective Thermal Conductivity of U-Zr Fuels
Atmosphere Controlled Thermogravimetric Analysis as a Tool to Screen, Test and Qualify Advanced Fuels under Extreme Conditions
Defect Density and Annealing Kinetics Estimation Using Thermal Diffusivity Measurements from Transient Grating Spectroscopy
Energy Balance Investigation of Close-coupled Optimized-pressure Gas Atomization Pour-tube Design Geometry to Prevent Melt Freeze-off
Mesoscale Modeling of the Effective Thermal Conductivity of a UO2-Mo Composite Nuclear Fuel
Multiphysics Mesoscale Modeling of Ablative Thermal Protection Systems
Non-magnetic Kondo Effect in Eelta-UZr2
Performance of UO2 Reactor Fuel with High Thermal Conductivity Additives
Phase-dictated Thermal Conductivity Response in Carbon Systems Exposed to Ion Irradiation
Phonon Transport in ThO2 from Neutron Scattering and First-principles Computation
Theory of Non-equilibrium Thermal Transport at High Temperatures from First-principles
Thermal and Mechanical Properties of Hafnon (HfSiO4), Theory and Experiments
Thermal Behaviors of Correlated Insulators ThO2 and SmB6
Thermal Conductivity and Heat Transport Processes of Ion Irradiated and Laser Heated Solids
Thermal Conductivity Degradation from Irradiation-induced Microstructural Defects in Single Crystal Thorium Dioxide
Thermal Gradient Effect on the Transport Properties of Helium and Intrinsic Defects in Tungsten
Thermal Stability of Metallic Multilayers with TripleJjunctions
Thermal Transport Behavior of U-50Zr at the Mesoscale: Before and After Irradiation
Thermal Transport in Irradiated ThO2: A Combined Experimental and Phonon Level Investigation
Ultra-high Lattice Thermal Conductivity and the Effect of Pressure in Superhard Hexagonal BC2N

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