Abstract
The isothermal section of the phase diagram of the Pr–Fe–Sb ternary system at 773 K has been investigated mainly by X-ray powder diffraction with the aid of metallographic analysis. Four ternary compounds Fe 4PrSb 12, FePrSb 2, Fe 13Pr 6Sb and FePrSb 3 have been confirmed and a new ternary compound PrFe 2Sb 2 was found in this system at 773 K. The isothermal section consists of 16 single-phase regions, 33 two-phase regions and 19 three-phase regions. The homogeneity range of ɛ (FeSb) phase extended from about 44 at.% Sb to 46 at.% Sb. The solubilities for the other single-phase regions were not observed. The structure type for PrFe 2Sb 2 is Ga 2S 3-type (sp. gr. Cc (no. 9), a = 0.60719 nm, b = 0.60867 nm, c = 1.33051 nm, β=103.1°).
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