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Section II: Phase Diagram Evaluations

Dy-Fe-Sb (Dysprosium-Iron-Antimony) V. Raghavan

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

Binary Systems The Dy-Fe phase diagram [Massalski2] has four line compounds: Fe17Dy2 (Ni2Th17-type hexagonal), Fe23Dy6 (D8a, 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), bDy4Sb3, aDy4Sb3 (D73, Th3P4-type cubic), bDySb, and aDySb (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 (s) 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.

References 2007Zen: L. Zeng, P. Qin, H. Qin, and J. Zhang, Crystal Structure and Magnetic Properties of the Compound FeDy6Sb2, Mater. Lett., 2007, 61(1), p 300-303 2008Liu: J. Liu, B. Zong, X. Yang, X. Cui, K. Su, X. Wang, and J. Li, The Isothermal Section of the Dy-Fe-Sb Ternary System at 773 K, J. Alloys Compd., 2008, 468, p 103-106

Fig. 1 Dy-Fe-Sb isothermal section at 500 °C [2008Liu]

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Journal of Phase Equilibria and Diffusion Vol. 30 No. 4 2009