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

The liquid phases of the LiF–BeF2–ThF4–UF4 binary subsystems have been assessed using a quasi-chemical model with general polynomial description. By extrapolating the optimized Gibbs energy terms from the binaries, the ternary subsystems were calculated, which form the boundaries of the quaternary system. A good agreement with experimental data on the ternary systems was obtained.