The 450°C isothermal section of the ZnüFeüV ternary phase diagram has been determined experimentally using X-ray diffraction and scanning electron microscopy coupled with energy/wave dispersive spectroscopy. A new ternary compound T, containing 1.4 to 4.5 at.% V, 5.6 to 15.5 at.% Fe and 82.3 to 92.2 at.% Zn, was positively identified for the first time in this study. The existence of the rphase, together with two ZnüV compounds, VZn 3 and V 4 Zn 5 , at 450°C has been confirmed. Fe has no detectable solubility in ZnüV compounds. But it was proved that about 3.0 at.% Zn can dissolve into α-V at 450°C. Experimental results indicated that the maximum solubility of V in d, γ 1 , and γ was 0.5 at.%, 1.3 at.% and 1.8 at.% respectively, whereas that in ζ was less than 0.2 at.%.