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The isothermal section of the Ni-Mn-Sb ternary system at 773K was investigated and constructed by X-ray diffraction(XRD),scanning electron microscopy(SEM),energy dispersion spectroscopy(EDS),and electron probe microanalysis(EPMA)techniques.The existence of 7 binary compounds NiMn,Mn2Sb,MnSb,NiSb2,NiSb,Ni5Sb2,Ni3Sb and 2 ternary compounds Ni2MnSb and NiMnSb was confirmed.The four binary compounds Ni3Sb(Cu3Ti-type structure,space group Pmmn),Ni5Sb2(Ni5Sb2-type structure,space group I2),NiSb2(FeS2-type structure,space group Pnnm)and Mn2Sb(Cu2Sb-type structure,space group P4/nmm)in the sub-binary systems Ni-Sb and Mn-Sb are stoichiometric compounds,the homogeneity ranges of which are negligible.While the five single phase regions in the Ni-Mn binary system and the binary compounds MnSb and NiSb show a more or less homogeneity ranges formed by replacement of Mn and Sb for Ni.The Huesler compound μ(Ni2MnSb)has L21-type ordered structure with space group Fm-3m,a =0.6017 nm.,and the crystal structure for the half-Huesler compound κ(NiMnSb)is C1btype(F-43m)with a =0.5961 nm.The homogeneity ranges of the two ternary compounds μ and κ at 773K were determined.