Phase relationships in the Pr–Fe–Sb system at 773K

Abstract: The isothermal section of the phase diagram of the Pr–Fe–Sb ternary system at 773K has been investigated mainly by X-ray powder diffraction with the aid of metallographic analysis. Four ternary compounds Fe4PrSb12, FePrSb2, Fe13Pr6Sb and FePrSb3 have been confirmed and a new ternary compound PrFe2Sb2 was found in this system at 773K. 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 44at.% Sb to 46at.% Sb. The solubilities for the other single-phase regions were not observed. The structure type for PrFe2Sb2 is Ga2S3-type (sp. gr. Cc (no. 9), a =0.60719nm, b =0.60867nm, c =1.33051nm, β=103.1°). [Copyright &y& Elsevier]