About this Abstract |
| Meeting |
2027 TMS Annual Meeting & Exhibition
|
| Symposium
|
Materials and Chemistry for Molten Salt Systems
|
| Presentation Title |
Thermodynamic modeling of samarium fission products in FLiNaK (LiF–NaF–KF) |
| Author(s) |
Jack A. Wilson, Emma L. Baker, Lianna M. Eaton, Annabelle Husek, Aiswarya Padinhare Manissery, Clara M. Dixon, Yunping Zhoujin, Silu Huang, Rongying Jin, Theodore M. Besmann |
| On-Site Speaker (Planned) |
Jack A. Wilson |
| Abstract Scope |
Understanding and modeling behavior of fission products in molten salt reactor (MSR) environments is critical to advancing MSR technology.
This study presents a thermodynamic assessment of samarium-containing systems within the prototypical FLiNaK salt (LiF–NaF–KF). Differential scanning calorimetry was used to clarify phase equilibria in chemical systems LiF–SmF<sub>3</sub>, NaF–SmF<sub>3</sub>, and KF–SmF<sub>3</sub>, and relaxation calorimetry was used to pin key thermochemical properties, including entropy and heat capacity, for relevant intermediate compounds NaSmF<sub>4</sub>, KSmF<sub>4</sub>, and K<sub>2</sub>SmF<sub>5</sub>. Enthalpy of mixing for each pseudo-binary system was estimated through a correlative method based on the ionic size difference parameter.
The result of the present work is a set of self-consistent Gibbs free energy functions within the CALPHAD framework, which describe chemical interactions of SmF<sub>3</sub> in molten FLiNaK environments. The resulting optimized thermodynamic models are slated for inclusion into the Molten Salt Database – Thermochemical (MSD-TC), a compendium of thermodynamic models for molten salts. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Nuclear Materials, Modeling and Simulation, High-Temperature Materials |