CALPHAD: Phase diagram of the system LiF---NaF---K2NbF7

The phase diagram of the ternary system LiF---NaF---K2NbF7, was determined using the thermal analysis method. Subsequent coupled analysis of the thermodynamic and phase diagram data were carried out to calculate the thermodynamically consistent phase diagrams. All of the three binary subsystems of our studied ternary system are simple eutectic ones. Because of the fact that all of them were already investigated and measured, this work deals with recalculation of the binary subsystems and investigation of the ternary system LiF---NaF---K2NbF7. The calculated coordinates of the ternary eutectic point is: 16 mole% LiF, 31 mole% NaF, 53 mole% K2NbF2; t = 585 °C. The probable inaccuracy in the calculated ternary phase diagram is 4.3 °C.