Electrode potential studies of liquid-solid equilibrium in Na sub 3 Bi-saturated Na-Bi melts

Liquid binary Na-Bi alloys have been studied extensively because of the interest in possible uses as electrochemically active couples in regenerative electrochemical cells, in high-energy batteries, and as potential heat-transfer media in nuclear reaction processes. However, no experimental thermodynamic data for liquid-solid equilibrium in liquid Na-Bi alloys saturated with solid Na sub 3 Bi have been reported in the literature. The aim of the present work was to investigate experimentally the equilibrium between Na-Bi melts and solid Na sub 3 Bi by the emf method in the range 638-973K. Measurements were made for the two-phase alloys using solid-state galvanic cells.