| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Accelerated Qualification of Nuclear Materials Integrating Experiments, Modeling, and Theories
|
| Presentation Title |
Probing Anharmonicity Effects at Elevated Temperatures in Ceramic Nuclear Fuels and Surrogates using Raman Spectroscopy |
| Author(s) |
Amey Rajendra Khanolkar, Saqeeb Adnan, David Hurley, Marat Khafizov |
| On-Site Speaker (Planned) |
Amey Rajendra Khanolkar |
| Abstract Scope |
Given that thermophysical properties such as thermal conductivity and heat capacity are dictated by lattice vibrations (phonons) in ceramic nuclear fuels, understanding anharmonic interactions of phonons at elevated temperature is crucial for developing accurate predictive tools for fuel behavior at operating temperatures. Raman spectroscopy is a facile means toward studying anharmonic phonon-phonon interactions via changes in the position and linewidth of zone-centered optical phonons with temperature. To this end, we investigate the anharmonic behavior of the first-order Raman-active mode in two nuclear fuels (uranium dioxide and thorium dioxide) and a fuel surrogate (cerium dioxide) from room temperature to 1000°C. By examining the temperature-induced changes of the vibrational properties of these fuels/surrogates, the contribution of volume expansion and anharmonic inter-mode coupling to the Raman frequency shift and line width in these systems are reported. This methodology can also benchmark calculations of phonon dispersion relationships and phonon linewidths from first principles. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Nuclear Materials, Ceramics |