Electric conductivities of molten salts of sodium fluoride-barium chloride-aluminum fluoride system and sodium fluoride-barium fluoride-aluminum fluoride system

Abstract

The specific electric conductivities of ternary moten salts of NaF-BaCl2-AlF3 and NaF-BaF2-AlF3 systems for electrolytic refining of aluminum were measured and were reported in the previous paper.The results were discussed and the following conclusions were drawn.(1) The specific electric conductivites of the binary NaF-BaCl2 molten salts were calculated by Taniuchi's modified formula, which is the modification of Markov's formula. The calculated values corresponded with the measured values very well.Then, the specific electric conductivities of the binary NaF-BaF2 molten salts over the whole range of composition were calculated by the above formula.(2) The measured values of the conductivities of the ternary molten salts of NaF-BaCl2-AlF3 and NaF-BaF-AlF3 systems were very different from the values expected from each binary molten salts composing the ternary systems; the former were very lower than the latter.The final conclusion was as follows: These ternary molten salts are not simple ionic melts, but are composed of several complex ions in molten state. It would be the reason of the fact that the measured values of specific electric conductivities of the ternary molten salts were very lower than the values expected from those of each binary molten salts composing the ternary systems.