Title: Thermodynamic investigation of the CaF2-ThF4 and the LiF-CaF2-ThF4 systems
Citation: JOURNAL OF CHEMICAL AND ENGINEERING DATA vol. 60 no. 11 p. 3166-3174
Publication Year: 2015
JRC N°: JRC94935
ISSN: 0021-9568
URI: http://pubs.acs.org/doi/10.1021/acs.jced.5b00347
DOI: 10.1021/acs.jced.5b00347
Type: Articles in periodicals and books
Abstract: In this study we present the thermodynamic description of the binary CaF2–ThF4 system and the ternary LiF–CaF2–ThF4 system. In order to describe the general shape of the phase diagram, the phase equilibria of several intermediate compositions of the CaF2–ThF4 system have been measured for the first time in the present work using the DSC technique. These results have been combined with X-ray diffraction studies for the identification of the phases in equilibrium and for the determination of the structure of the CaThF6 compound. Considering all of the novel experimental data, the CaF2–ThF4 system has been assessed for the first time using the Calphad approach. Moreover, the ternary LiF–CaF2–ThF4 phase diagram has been calculated and optimized using the experimental data obtained in this study for the ternary mixtures. The model developed reproduces very well all the measurements performed and correctly predicts the lowest eutectic temperature and composition.
JRC Directorate:Nuclear Safety and Security

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