Solid-liquid phase equilibrium in the sodium-caesium alloy system

Thermal methods were used to determine with high precision the solid-liquid phase equilibria diagram for the sodium-caesium system. The results differ greatly from those of earlier workers, especially near the eutectic composition, where differences in melting points as large as 35 K occur. Identification of the phases involved in the peritectic halt was not conclusive, but does support the proposal that the peritectic results from the formation of an Na2Cs intermetallic compound by a sluggish reaction.