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GL11-S2 Physical and chemical properties of molten salts Jacques Fouletier and Jean-Claude Poignet Molten salts can be suitable to handling very reactive elements, for various processes such as preparation, partitioning, chemical or electrochemical reprocessing : for example, Na, Li, Ca, Al, F2 are prepared by molten salts electrolysis on the industrial scale. Furthermore, reactions in such highly concentrated ionic media are very fast. General features concerning properties of molten salts (temperature domains of possible use, thermal, chemical or electrochemical stability) are given and commented. Focusing on molten halides, which are most appropriate to various applications in nuclear energy, a survey of physical parameters such as density, vapour pressure, transport properties (diffusion, viscosity, electrical conductivity), is given. Chemical properties (acido-basicity, particular role of oxide ions and of water, complexation) are commented and methods for preparation and purification of molten halides are briefly described. Electrochemical properties (standard potential scales) are presented. Finally, electrochemical methods usable in molten salts for analysis or processing are briefly described.
