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

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...

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Hauptverfasser: Beilmann, Markus (VerfasserIn) , Beneš, O. (VerfasserIn) , Konings, R. J. M. (VerfasserIn) , Fanghänel, Thomas (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 2013
In: The journal of chemical thermodynamics
Year: 2012, Jahrgang: 57, Pages: 22-31
ISSN:1096-3626
DOI:10.1016/j.jct.2012.08.001
Online-Zugang:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1016/j.jct.2012.08.001
Verlag, lizenzpflichtig, Volltext: http://www.sciencedirect.com/science/article/pii/S002196141200300X
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Verfasserangaben:M. Beilmann, O. Beneš, R.J.M. Konings, Th. Fanghänel

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520 |a 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. 
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