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Section II: Phase Diagram Evaluations

Er-Fe-Mn (Erbium-Iron-Manganese) V. Raghavan

Recently, [2009Liu] determined an isothermal section for this ternary system at 500 °C. There are no ternary compounds. The solubility of the third component in the Fe-Er and Er-Mn binary phases is extensive (except in Fe3Er).

Binary Systems The Er-Fe phase diagram [Massalski2] depicts the following compounds: Fe17Er2 (Ni17Th2-type hexagonal), Fe23Er6 (D8a, Mn23Th6-type cubic), Fe3Er (Be3Nb-type rhombohedral) and Fe2Er (C15, MgCu2-type cubic). The Er-Mn phase diagram [Massalski2] has the following intermediate phases: ErMn12 (D2b, ThMn12-type tetragonal), Er6Mn23 (D8a, Mn23Th6-type cubic) and ErMn2 (C14, MgZn2-type hexagonal). There are no intermediate phases in the Fe-Mn system.

Ternary Isothermal Section With starting metals of 99.9% Er, 99.9% Fe and 99.8% Mn, [2009Liu] arc-melted 256 alloys under Ar atm. The alloys were given a final anneal at 500 °C for 7 days and quenched in liquid nitrogen. The phase equilibria were mainly studied with x-ray powder diffraction. The isothermal section at 500 °C constructed by [2009Liu] is shown in Fig. 1. There are no ternary compounds in the system. The isostructural compounds Er6Mn23 and Fe23Er6 form a continuous solid solution. The solubility of Fe in ErMn12 and ErMn2 phases is up to 69 and 13 at.% respectively. The solubility of Mn in Fe2Er and Fe17Er2 is up to 47 and 28 at.% respectively. Reference 2009Liu: J. Liu, K. Su, X. Li, X. Wang, X. Yang, M. Tang, and C. Li, Phase Relationships in the Er-Fe-Mn Ternary System at 773 K, J. Alloys Compd., 2009, 474, p 113-117

Fig. 1 Er-Fe-Mn isothermal section at 500 °C [2009Liu]

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Journal of Phase Equilibria and Diffusion Vol. 31 No. 2 2010