Thermodynamic evaluation of the MF–LaF3 (M=Li, Na, K, Rb, Cs) systems

Abstract In a previous paper the LiF–NaF–RbF–LaF 3 quaternary system has been described as one of the possible fuels for molten salt reactor application. In this work the LiF–KF, NaF–KF, RbF–KF, LaF 3 –KF, LiF–CsF, NaF–CsF, KF–CsF, RbF–CsF and CsF–LaF 3 binary systems are thermodynamically assessed in order to add the KF and CsF to this existing system. The modified quasi-chemical model based on the quadruplet approximation has been used for the liquid description, while for solid solutions the classical polynomial formalism has been used. Ternary systems have been calculated using the Kohler/Toop formalism and are presented in this work as well.