Thermodynamic description of the Er–Fe–Sb system

Abstract

The Er–Fe, Er–Sb and Er–Fe–Sb systems were optimized by means of the CALPHAD (CALculation of PHAse Diagram) technique. The solution phases, liquid, bcc, fcc, hcp and rhom, were described by the substitutional solution model. The binary compounds, Er 2Fe 17, Er 6Fe 23, ErFe 3, ErFe 2, Er 5Sb 3, αErSb, βErSb, ErSb 2 and ternary compound Er 6FeSb 2 were treated as stoichiometric compounds. The thermodynamic description of the Fe–Sb system was taken from the literature. A self-consistent thermodynamic description of the Er–Fe–Sb system was obtained.