Study On The 773K Isothermal Section Of The Nd-Fe-Sb Ternary System And On The Cystal Structure Of Compounds FeDy₆Sb₂, NdFeSb₃

Phase relations in the Nd-Fe-Sb ternary system at 773K have been investigated in this work. Moreover, the crystal structures of FeDy₆Sb₂ and NdFeSb₃ have also been studied. The main contents were related as follows:1. The isothermal section of Nd-Fe-Sb ternary system at 773KPhase relations in the Nd-Fe-Sb ternary system at 773K have been investigated by means of powder X-ray diffraction technique, diffirrential thermal analysis. Nine binary compounds have been confirmed through our study: A(Nd₂Fe₁₇), B(Nd₅Fe₁₇). C(Nd₂Sb) D(Nd₅Sb₃,) E(Nd₄Sb₃) F(NdSb), G(NdSb₂) H(FeSb₂) , I(FeSb); Three ternary compound J(Nd₆Fe₁₃Sb), K(NdFe_1-xSb₂) and L(NdFe₄Sb₁₂) were confirmed. At the meantime, we found the FeSb had a solid soluble region. The solid solubility of of Fe in FeSb which was determined by the varying of lattice parameters is about 2.3 at.%. Two new ternary compounds M(NdFeSb₃) N (-NdFe_2.5Sb₂) were found. According to the results of experiment, we constructed the phase diagram of Nd-Fe-Sb ternary system at 773K. It consists of 17 single-phase regions, 36 two-phase regions and 20 three-phase regions.