Abstract

Kim and Simkovich have recently published a study of transport properties in molten sodium sulphate at 1173 K. Surprisingly enough, their electrical conductivity is one order of magnitude lower than according to all other studies of the pure salt. Their result is also in conflict with the general systematics found for high-conducting melts. The possible sources of error in conductivity measurements are discussed, and so are also the concept of transport number for pure molten salts and the validity of the Nernst-Einstein relation. Their transport number experiment is reinterpreted, which has some consequences for the calculated sodium ion mobility and self diffusion coefficient.

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