Title: Thermodynamic determination and assessment of the CsF-ThF4 system
Authors: VOZAROVA NIKOLETASMITH ANNACOLLE JEAN-YVESRAISON PHILIPPEBOUEXIERE DANIELKONINGS RUDYBENES ONDREJ
Citation: JOURNAL OF CHEMICAL THERMODYNAMICS vol. 114 p. 71-82
Publisher: ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
Publication Year: 2017
JRC N°: JRC106794
ISSN: 0021-9614
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC106794
DOI: 10.1016/j.jct.2017.05.008
Type: Articles in periodicals and books
Abstract: In this study we present a comprehensive thermodynamic description of the binary CsF-ThF4 system. The phase equilibria of several intermediate compositions in this system have been determined using the DSC technique combined with a post-analysis using powder X-ray diffraction. Considering all the novel experimental data, a thermodynamic model for the CsF-ThF4 system has been developed for the first time using the Calphad approach. The present model reproduces very well the measurements performed. Knudsen effusion mass spectrometry (KEMS) has further been used to investigate the vapour pressure over the molten CsF-ThF4 salt and to determine the thermodynamic activities of CsF and ThF4 in the liquid solution. As part of this study, the vaporization of pure CsF was examined and the results were compared with the literature showing a good agreement. Next, the vapour pressure of CsF-ThF4 in the liquid solution was investigated by measuring three samples with compositions X ThF4 = (0.4, 0.6, 0.8) mol/mol. A strong negative deviation from Raoult’s law was observed for both species, more evident in case of CsF, and a good agreement with the predictions of our thermodynamic model was found. This article is a pre-requisite for the assessment of the ternary LiF-CsF-ThF4 system.
JRC Directorate:Nuclear Safety and Security

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