# Investigation of the Na–Ga Phase Diagram

## TL;DR

This study investigates the sodium-gallium phase diagram, identifying melting and decomposition temperatures of various phases.

## Contribution

The paper provides new experimental data on the Na–Ga phase diagram using HF-DSC and PXRD.

## Key findings

- Na22Ga39 melts congruently at 549(2) °C.
- A monotectic reaction occurs between Na22Ga39 and melt at 495(2) °C.
- The critical temperature of the liquid two-phase region is estimated at 523(2) °C.

## Abstract

The Na–Ga
phase diagram was reinvestigated by
heat-flux
differential scanning calorimetry (HF-DSC) and powder X-ray diffraction
(PXRD). The most sodium-rich phase, Na22Ga39, melts congruently (549(2) °C), while Na7Ga13 (545(2) °C), Na2Ga7 (501(2) °C),
and NaGa4 (495(2) °C) decompose peritectically. In
the sodium-rich region, a monotectic reaction between Na22Ga39 and melt occurs at 495(2) °C. The critical temperature
of the liquid two-phase region was estimated to 523(2) °C. The
subtle differences in the decomposition temperatures of neighboring
phases were resolved by differential thermal analysis using a mutual
sample reference method.