Thermal properties of LiF-BeF2 and LiF-BeF2-UF4 systems as applied to molten salt reactor technologies

Thermal Properties of Li2BeF4 near Melting Point

“…On heating, only the solidus line was observed at 730 K, which is in good agreement with literature data [6]. The first peak on cooling corresponds to the melting point of the eutectic composition 45LiF-55BeF2 (T = 651 K [4]). The second peak at 620.3 K corresponds to the phase transition to a solid state.…”

“…The thermal diffusivity values of Li2BeF4 shown in Figure 1 were obtained under cooling mode, in which a gradual change in diffusivity was observed at the temperature interval 653-731 K. This corresponds to the undercooling conditions at cooling of sample [4]. The sample under these conditions consists of solid and liquid phases, which is reflected in the resulting diffusivity.…”

“…Li 2 BeF 4 is also known for some unusual behavior at the phase transition. The undercooling phenomenon is attributed to this composition [4]. While Li 2 BeF 4 transitions to a molten state at 458 • C under heating, the freezing process takes place at the temperature interval 458-380 • C under certain conditions.…”

Compositional transferability of deep potential in molten LiF–BeF2 and LaF3 mixtures: prediction of density, viscosity, and local structure

“…and the values are listed in Table 2. The % D declines as the LaF 3 concentration increases, and the linear relationship is as follows, % D(10 À6 cm 2 s À1 ) = 10.79 À 0.59c La (4) The fitted index R 2 of % D and c La is good, about 0.98, meaning that the eqn (4) can be used to predict the weighted diffusion coefficient of molten Flibe + LaF 3 with any LaF 3 composition.…”

“…According to the last NVT configuration, the positions of Li or Be are manually exchanged with La to overcome the possible dynamic energy barriers while enriching sampling configurations. These new configurations are named by the number of Li (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12) and Be (1-6), which are simulated by repeating the above NPT-NVT process, respectively.…”