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The 450℃ isothermal section of the Zn-Fe-Nb ternary system with an emphasis on the Zn-rich corner was experimentally determined by means of optical microscopy,SEM-EDS analysis and X-ray diffraction.A true ternary phase T has been identified.This phase is in equilibrium with ε,μ,NbZn7,NbZn3,δ,ζand ηphase in the system.The solubility of Nb in all Fe-Zn intermetallic compounds is negligible.