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The solubility of silica in fluoride–chloride electrolytes for use in the electrolysis of solar-grade silicon was studied. The visual method was used for the investigation. Liquidus temperatures were investigated by thermal analysis. The silica solubility rises with KF content and temperature. The densities of the compositions with high silica solubility were determined.

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The heat capacities of molten salts are very important for their practical use. Experimental investigation of this property is challenging because of the high temperatures involved and the corrosive nature of these materials. It is preferable to combine experimental investigations with empirical relationships, which allows for the evaluation of the heat capacity of molten salt mixtures. The isobaric molar heat capacities of all molten alkali and alkaline-earth halides were found to be constant for each group of salts. The value depends on the number of atoms in the salt, and the molar heat capacity per atom is constant for all molten halide salts with the exception of the lithium halides. The molar heat capacities of molten halides do not change when the anions are changed.