Thermodynamic Investigations of the KF-CsI, NaI-KI, and MgCl2-SrCl2 2 Pseudo-binary Systems

While molten salt systems have been studied extensively in the past, modern experimental techniques provide an opportunity to refine and validate previous thermodynamic data with improved accuracy. This study investigates three pseudo-binary salt systems relevant to molten salt reactor applications: KF–CsI, NaI–KI, and MgCl2–SrCl2. Differential Scanning Calorimetry (DSC) was employed to generate new experimental data for the MgCl2–SrCl2 system while reassessing previous thermodynamic models for KF–CsI and NaI–KI. The thermodynamic assessments were developed using the CALPHAD method, integrating experimentally derived phase transition data with the Modified Quasi-Chemical Model in the Quadruplet Approximation (MQMQA) thermodynamic model for implementation in the Joint Research Centre Molten Salt Database (JRCMSD). The results confirmed previously reported KF–CsI data, revealed discrepancies in the liquidus curve of NaI–KI compared to prior studies, and indicated the need for further investigation into the MgCl2–SrCl2 system.

SCURO Nikolas;  COLLINS Morgan;  BENES Ondrej;  SKLENKA Jan;  PIRO Markus; 

2026-02-18

SPRINGER

JRC141508

1543-1940 (online),   

https://link.springer.com/article/10.1007/s11661-025-07774-9,    https://publications.jrc.ec.europa.eu/repository/handle/JRC141508,   

10.1007/s11661-025-07774-9 (online),