| Abstract
| - The ternary systems LiF−NaF−LaF3 and LiF−NaF−CeF3 have been experimentally analyzed andthermodynamically assessed. Two models were used and compared to describe the excess Gibbs termsof the binary subsystems. One was a regular polynomial description of the excess terms, the other aquasichemical in the quadruplet approximation. In both cases, a fine agreement with the experimentaldata was achieved, after asymmetrical extrapolation from the binary to the ternary systems. The binarysystems of the related actinide system LiF−NaF−PuF3 were assessed, making use of experimental dataknown from the literature. The lanthanide systems served as a proxy for LiF−NaF−PuF3 to calculate theternary phase diagram.
- A proposed fuel for the molten salt reactor is a LiF−NaF−PuF3 eutectic mixture. LiF−NaF−MF3 (M = La, Ce) binary subsystems were thermodynamically assessed using literature and our own experimental data. A general polynomial and a quasichemical model were used and compared to extrapolate the binaries to the ternary systems. The LiF−NaF−PuF3 diagram was calculated using the lanthanide systems as a proxy.
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