About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Materials and Chemistry for Molten Salt Systems
|
Presentation Title |
Diffusion Dynamics of Molten FLiNaK Quantified with Quasi-elastic Neutron Scattering |
Author(s) |
Brent J. Heuser, Golam Rakib, Yang Zhang, Shao-Chun Lee |
On-Site Speaker (Planned) |
Brent J. Heuser |
Abstract Scope |
The Cold Neutron Chopper Spectrometer at the Spallation Neutron Source was used to measure the incoherent quasi-elastic neutron scattering response of molten FLiNaK, a potential coolant and fuel for molten salt reactors. The element weighted self diffusion coefficient was measured by fitting the 3 meV QENS broadening as a function of temperature from 500 C to 800 C. Enriched Li-7 was used to reduce the strong absorption from Li-6. We determine the activation energy associated with self diffusion from the temperature dependence of the diffusivity, Ea=0.46 eV. Discussion will focus on the comparison of our measured diffusivities and advanced computations of the same system. In addition the effect of Ce dopant on the system dynamics will be presented. Finally, the effect of Ce on the melting temperature and specific heat will be presented. |
Proceedings Inclusion? |
Planned: |
Keywords |
Nuclear Materials, |