The direction of electromigration in liquid Na-K alloys reverses with composition. Coefficients of electron drag have been measured in dilute alloys, where the separation is greatest, and in an alloy of composition approximating the null point. Theoretical calculations of the electron-ion interactions in these alloys, have been used to refine the Epstein-Paskin model for electromigration in liquid alloys, and to explain the observed reversal.

• Received 20 October 1969

DOI:https://doi.org/10.1103/PhysRevB.1.2442