Isothermal section of the Er-Fe-Al ternary system at 800 oC

Physico-chemical analysis techniques, including X-ray diffraction and Scanning Electron Microscope-Energy Dispersive X-ray Spectroscopy, were employed to construct the isothermal section of the Er-Fe-Al system at 800 oC. At this temperature, the phase diagram is characterized by the formation of five intermediate phases, ErFe12-xAlx with 5 ≤ x ≤ 8 (ThMn12-type), ErFe1+xAl1-x with -0.2 ≤ x ≤ 0.75 (MgZn2-type), ErFe3-xAlx with 0.5 < x ≤ 1 (DyFe2Al-type), Er2Fe17-xAlx with 4.74 ≤ x ≤ 5.7 (TbCu7-type) and Er2Fe17-xAlx with 5.7 < x ≤ 9.5 (Th2Zn17-type), seven extensions of binaries into the ternary system; ErFexAl3-x with x < 0.5 (Au3Cu-type), ErFexAl2-x with x ≤ 0.68 (MgCu2-type), Er2FexAl1-x with x ≤ 0.25 (Co2Si-type), ErFe2-xAlx with x ≤ 0.5 (MgCu2-type), ErFe3-xAlx with x ≤ 0.5 (Be3Nb-type), Er6Fe23-xAlx with x ≤ 8 (Th6Mn23-type), and Er2Fe17-xAlx with x ≤ 4.75 (Th2Ni17-type) and one intermetallic compound; the ErFe2Al10 (YbFe2Al10-type).