An isothermal section at 500 °C for this ternary system was recently reported by [2008Liu], which depicts one ternary compound FeDy6Sb2 (τ).

Binary Systems

The Dy-Fe phase diagram [Massalski2] has four line compounds: Fe17Dy2 (Ni2Th17-type hexagonal), Fe23Dy6 (D8 a , Mn23Th6-type cubic), Fe3Dy (Be3Nb-type rhombohedral), and Fe2Dy (C15, MgCu2-type cubic). The Dy-Sb phase diagram depicts the following line compounds: Dy5Sb3 (D88, Mn5Si3-type hexagonal), βDy4Sb3, αDy4Sb3 (D73, Th3P4-type cubic), βDySb, and αDySb (NaCl-type cubic). The Fe-Sb phase diagram [Massalski2] has two intermediate phases: FeSb1-x (40-48 at.% Sb; B81, NiAs-type hexagonal) and FeSb2 (C18, marcasite-type orthorhombic).

Ternary Isothermal Section

With starting metals of 99.9% Dy, 99.9% Fe, and 99.99% Sb, [2008Liu] arc-melted under Ar atm 112 alloys, which were given a final anneal at 500 °C for 10-20 days and quenched in water. The phase equilibria were studied with x-ray powder diffraction. They found that the binary compound Dy4Sb3 is not stable at 500 °C and decomposes after prolonged annealing. The isothermal section at 500 °C constructed by [2008Liu] is shown in Fig. 1. The ternary compound FeDy6Sb2 (τ) is present. It has the Fe2P-type of hexagonal structure, with a = 0.81449 nm and c = 0.41641 nm [2007Zen]. No solubility of the third component in the binary compounds was observed.

Fig. 1
figure 1

Dy-Fe-Sb isothermal section at 500 °C [2008Liu]

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