Thermodynamic assessment of the LiF-NiF<sub>2</sub>, NaF-NiF<sub>2</sub> and KF-NiF<sub>2</sub> systems

Journal article (2018)

Authors

E. Capelli RST/Reactor Physics and Nuclear Materials - AS
Philippe E. Raison European Commission Joint Research Centre, Institute for Transuranium Elements Karlsruhe
R. Konings European Commission Joint Research Centre, Institute for Transuranium Elements Karlsruhe, RST/Reactor Physics and Nuclear Materials - AS
A.L. Smith RST/Reactor Physics and Nuclear Materials - AS
Research Group
RST/Reactor Physics and Nuclear Materials (AS) (TU Delft)
Copyright: © 2018 J.A. Ocadiz flores, E. Capelli, P. E. Raison, R. Konings, A.L. Smith
DOI
help_outline
https://doi.org/10.1016/j.jct.2018.01.023
X-ray diffraction Molten Salt Reactor CALPHAD Differential Scanning Calorimetry
More Info
expand_more

Published Date

01-06-2018

Language

English

Faculty

Applied Sciences

Department

RST/Radiation, Science and Technology

Research Group

RST/Reactor Physics and Nuclear Materials

Abstract

Using the modified quasi-chemical model in the quadruplet approximation, three new thermodynamic assessments of binary systems useful for the detailed operational design of the Molten Salt Reactor are presented: AF-NiF2 (A = Li, Na, K). These systems are particularly relevant for the study of the molten salt-structural materials interaction, as the salt containment is made of a Ni-based alloy. Using powder X-ray Diffraction (XRD) and Differential Scanning Calorimetry (DSC), new experimental data were gathered for two of these systems, LiF-NiF2 and KF-NiF2, and compared to previous experimental assessments. Our data have confirmed the formation of a (Li1-2xNix)F solid solution. The three thermodynamic models show a very good agreement with the experimental data. The melting point of NiF2 was measured for the first time to be T = (1629 ± 5) K, and the thermal expansion coefficient for Li2NiF4 was found to be α=27.6·10-6K-1 in the temperature range T = (298–773) K.