Electrotransport of Sodium in Liquid Potassium Metal

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Abstract
The electromigration of 22Na has been studied in liquid Na-K of two compositions, about 1% and 11% Na. For the low Na alloy the effective charge number Z∗exp (of tracer motion relative to container) ranges from about − 12 at the m.p. to − 5.5 at 300°C, and for 11% Na from − 3.5 at the m.p. to − 2.5 at 150°C. The migration velocity, obtained by a method free from convective disturbances, is found to be by an order of magnitude higher than that quoted in one earlier investigation, and by some 50% higher than another set of data. Theoretical arguments, connecting Z∗exp with the resistivity increment per impurity atom, are well borne out by the present results, and also predict the change of sign observed at higher Na concentrations.

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