Sodium–lithium phase diagram: redetermination of the liquid immiscibility system by resistance measurement

Abstract

The sodium–lithium phase diagram has been determined over the entire composition range by a combination of resistance and thermal methods. Each method is especially effective for specific parts of the phase diagram. Two liquid phases separate below 305 ± 1 °C; this temperature is variously reported between 303 and 442 °C in the literature. The consolute composition is 63 mol % Li. The immiscibility boundary extends from 10.1 to 97.0 mol % Li at the monotectic temperature 170.75 ± 0.05 °C. A eutectic occurs at 3.0.mol % Li and 92.10 ± 0.05 °C. Positive deviation from ideality has been observed for both sodium- and lithium-rich solutions.