Phase relationships in the Er–Fe–Mn ternary system at 773 K

In order to determine the existence of phases and relationships in the Er–Fe–Mn system at 773 K, we have carried out this work mainly by X-ray powder diffraction with the aid of differential thermal analysis and have obtained the conclusions below. The existence of seven binary compounds ErFe2, ErFe3, Er6Fe23, Er2Fe17, ErMn12, Er6Mn23, ErMn2 and one intermediate solid solution γ(Fe·Mn) have been confirmed in this system. Er6Fe23 and Er6Mn23 form continuous solid solution Er6 (Fe23−X MnX) (0 ≤ X ≤ 23). At 773 K, the maximum solid solubility of Fe in αMn, ErMn12, ErMn2 phases and Mn in ErFe2, Er2Fe17, αFe phases are about 31, 69, 13 at% Fe and 47, 28, 8 at% Mn, respectively. The homogeneity range of γ(Fe·Mn) phase extended from about 34 at% Mn to 52 at% Mn. The maximum solid solubility of Er in γ(Fe·Mn) phase is about 2 at% Er. The isothermal section consists of ten single-phase regions, sixteen two-phase regions and seven three-phase regions. No ternary compounds were observed at 773 K in this system.