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On a évalué les propriétés thermodynamiques des phases liquides ternaires en faisant appel à la théorie des solutions ioniques conformales. On a calculé les diagrammes de phase et les propriétés thermodynamiques de 5 systèmes ternaires additifs de sels fondus et de 9 systèmes ternaires réciproques de sels fondus contenant des ions Li +, Na +, ,OH − ces calculs ont été effectués à partir des propriétés thermodynamiques de leurs sous-systèmes binaires que l'on a obtenues antérieurement par un évaluation critique des données thermodynamiques et des diagrammes de phase de ces systèmes binaires. A critical assessment of error limits on all the calculated ternary diagrams is made, and suggestions as to which composition regions merit further experimental study are given. The thermodynamic approach permits experimental data to be critically assessed in the light of thermodynamic principles and accepted solution models. In this way, ternary phase diagram measurements can be smoothed and the isotherms drawn in a thermodynamically correct way. If, in addition, some reliable ternary phase diagram measurements are available, these can be used to obtain small ternary correction terms. It is found that a ternary phase diagram can generally be calculated in this way with a maximum error about twice that of the maximum error in the binary phase diagrams upon which the calculations are based. The ternary phase diagrams are then calculated from these thermodynamic properties by means of computer programs designed for the purpose. Thermodynamic properties of ternary liquid phases are estimated from the binary properties by means of the Conformal Ionic Solution Theory. Phase diagrams and thermodynamic properties of five additive molten salt ternary systems and nine reciprocal molten salt ternary systems containing the ions Li +, Na +,, OH − are calculated from the thermodynamic properties of their binary subsystems which were obtained previously by a critical assessment of the thermodynamic data and the phase diagrams in these binary systems.