The Isothermal Section Of The Er-Fe-Mn Ternary System At 773K

The isothermal section of the Er-Fe-Mn ternary system at 773K has been investigated mainly by X-ray powder diffraction with the aid of differential thermal analysis. The existence of seven binary compounds ErFe2, ErFe3, Er₆Fe₂₃, Er₆Mn₂₃, Er₂Fe₁₇, ErMn₁₂, ErMn₂ and one intermediate solid solution y (Fe-Mn) were conformed in this system. Er₆Fe₂₃ and Er₆Mn₂₃ form continuous solid solution Er₆ (Fe-Mn)₂₃. At 773 K, the maximum solid solubility of Fe inαMn, ErMn₁₂, ErMn₂ phases and Mn in ErFe₂, Er₂Fe₁₇, aFe phases are about 31, 69, 13 at% Fe and 47, 28, 8 at% Mn, respectively. The homogeneity range of the intermediate solid solutiony (Fe-Mn) extended from about 34 at.% Mn to 52 at.% Mn. the maximum solid solubility of Er in the intermediate solid solutionγ(Fe-Mn) is about 2 at.%Er. No ternary compounds were observed at 773 K in this system. The section consists of ten single-phase regions, sixteen two-phase regions and seven three-phase regions.The ten single-phase regions are:A (Er),B (ErFe₂),C (ErFe₃),D(Er₆e₂₃·Er₆Mn₂₃,E (Er₂Fe₁₇),F (Fe),G(γFe),H (Mn),I (ErMn₁₂) and J(ErMn₂).The sixteen two-phase regions are : A+B,B+C,C+D,D+E,E+F,F+G,G+H,H+I,I+D,D+J,J+A,B+D,B+J,E+I,E+G and G+I.The seven three-phase regions are : A+B+J,B+C+D,B+D+J,D+E+I,E+F+G,E+G+I and G+H+I.