Thermodynamic assessment of the (LiF+UF3) and (NaF+UF3) systems

• Verfasst von: Beilmann, Markus [VerfasserIn]
• Verfasst von: Beneš, O. [VerfasserIn]
• Verfasst von: Konings, R. J. M. [VerfasserIn]
• Verfasst von: Fanghänel, Thomas [VerfasserIn]
• Titel: Thermodynamic assessment of the (LiF+UF3) and (NaF+UF3) systems
• Verf.angabe: M. Beilmann, O. Beneš, R.J.M. Konings, Th. Fanghänel
• Jahr: 2013
• Jahr des Originals: 2012
• Umfang: 10 S.
• Fussnoten: Im Titel ist die Zahl 3 tiefgestellt ; Gesehen am 20.11.2020 ; First published: 14 August 2012
• Titel Quelle: Enthalten in: The journal of chemical thermodynamics
• Ort Quelle: London : Academic Press, 1969
• Jahr Quelle: 2013
• Band/Heft Quelle: 57(2013), Seite 22-31
• ISSN Quelle: 1096-3626
• DOI: doi:10.1016/j.jct.2012.08.001
• Datenträger: Online-Ressource
• Sprache: eng
• Sach-SW: DSC
• Sach-SW: Fluoride salt
• Sach-SW: Phase diagram
• Sach-SW: Thermodynamic modelling
• K10plus-PPN: 1740223764

Abstract

In this article new thermodynamic descriptions of the (LiF+UF3) and the (NaF+UF3) systems based on new calorimetric data are presented. The experimental investigations were carried out using differential scanning calorimetry (DSC) to obtain phase transition temperatures between (0 and 60)mol% of UF3. On the basis of these measurements a thermodynamic assessment of the (LixU1-x)F3-2x and (NaxU1-x)F3-2x liquid solutions, using the quasi-chemical model was achieved. UF3 undergoes a disproportionation at higher temperatures to UF4 and U metal which had a significant impact on the transition temperatures in the (LiF+UF3) system. For this reason the influence of the presence of up to 15mol% of UF4 in this system was calculated and compared to the experimental results. The final thermodynamic description was corrected for the pure binary system.