Thermodynamic Assessment of the AF–CrF3 (A = Li, Na, K) and CrF2–CrF3 Systems

Dumaire, T.; Konings, R.; Smith, A.L.

doi:10.3390/thermo1020014

Thermodynamic Assessment of the AF–CrF3 (A = Li, Na, K) and CrF2–CrF3 Systems

Title

Thermodynamic Assessment of the AF–CrF3 (A = Li, Na, K) and CrF2–CrF3 Systems

Author

Dumaire, T. (TU Delft RST/Reactor Physics and Nuclear Materials)
Konings, R. (TU Delft RST/Reactor Physics and Nuclear Materials; Joint Research Centre (JRC))
Smith, A.L. (TU Delft RST/Reactor Physics and Nuclear Materials)

Date

2021

Abstract

Understanding the corrosion mechanisms and the effect of corrosion products on the basic properties of the salt (e.g., melting point, heat capacity) is fundamental for the safety assessment and durability of molten salt reactor technology. This work focused on the thermodynamic assessment of the CrF2−CrF3 system and the binary systems of chromium trifluoride CrF3 with alkali fluorides (LiF, NaF, KF) using the CALPHAD (computer coupling of phase diagrams and thermochemistry) method. In this work, the modified quasi-chemical model in the quadruplet approximation was used to develop new thermodynamic modelling assessments of the binary solutions, which are highly relevant in assessing the corrosion process in molten salt reactors. The agreement between these assessments and the phase equilibrium data available in the literature is generally good. The excess properties (mixing enthalpies, entropies and Gibbs energies) calculated in this work are consistent with the expected behaviour of decreasing enthalpy and Gibbs energy of mixing with the increasing ionic radius of the alkali cations.

Subject

Molten Salt Reactor
corrosion
Chromium fluoride
CALPHAD
FLiNaK

To reference this document use:

http://resolver.tudelft.nl/uuid:cba80ec1-d9fe-4bd4-974e-629b6ac8c491

DOI

https://doi.org/10.3390/thermo1020014

ISSN

2673-7264

Source

Thermo, 1 (2), 205-219

Part of collection

Institutional Repository