Thermodynamic assessment of the LiF–BeF2–ThF4–UF4 system

Thermodynamic properties and phase diagrams of fluoride salts for nuclear applications

“…As discussed by van der Meer and Konings [17] the molar volume derived from the measured density data indicate ideal behavior, suggesting that the density can be interpolated from the molar volume data for the pure components. However, the density and molar volume of liquid BeF 2 are not known well, and only at a single temperature (T ¼ 1073 K) and not at all as function of temperature.…”

“…Vallet and Braunstein [15] suggested that a miscibility gap may occur at the BeF 2 -rich side of the diagram, based on model calculations. Van der Meer et al [16,17] arrived at the same conclusion based on optimization of the phase diagram data. The assessed phase diagram from that latter study is shown in Fig.…”

“…According to the thermodynamic data obtained from [44] the vapour pressure of the LiF-ThF 4 (78-22 mol%) composition has been calculated for the temperature range between 839 K to 1473 K. The result is given in equation below: log 10 p ðPaÞ ¼ 11:902 À 12989 T ðKÞ…”

Heat-transport properties of molten fluorides: Determination from first-principles

“…Future work should focus on the prediction of these quantities for other salts like LiF-ThF 4 , for which very few experimental data is available. It is important to note that nowadays an important experimental work is aimed at the determination of structural [33][34][35][36][37][38][39] and electrochemical [40][41][42][43] properties of the molten fluorides, but only one group is involved in studies concerning their thermal properties [44][45][46](some work has also been done on the system LiF-NaF-BeF 2 in the framework of the fusion energy reactors [47]). In the future simulations will be of particular importance to complete the gaps in the necessary databases.…”

Thermodynamic evaluation of the (LiF+NaF+BeF2+PuF3) system: An actinide burner fuel

“…This idea was supported by the fact that a similar (BeF 2 + ThF 4 ) system assessed in the work by van der Meer et al [27] possesses of relatively small excess Gibbs free energy (maximum of about 1 kJ Á mol À1 at T = 1100 K as shown in figure 7 in their work). Furthermore we have calculated the (BeF 2 + MgF 2 ) system treating the liquid solution ideally and found a good agreement to the experimentally determined phase diagram as published by Roy and Osborn [28].…”