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The subsolidus phase relations of the ternary system ZnO-V(2)O(5)-WO(3) was investigated by means of Xray diffraction (XRD) analysis. The phase relations had been constructed. Five binary compounds, five tie lines and six three-phase regions were determined in this system. The possible component regions for ZnO single crystal flux growth were discussed. The phase diagram of Zn(4)V(2)O(9)-ZnWO(4) pseudo-binary system from 740 degrees C to 1300 degrees C was also determined through XRD and differential thermal analysis (DTA) methods. DTA results indicated this system was a eutectic system, and the eutectic temperature was 880 degrees C and eutectic point component was 78 mol% Zn(4)V(2)O(9) and 22 mol% ZnWO(4). The compounds composed of 78 mol% Zn(4)V(2)O(9) and 22 mol% ZnWO(4) might be suitable flux for ZnO crystal growth. (C) 2008 Elsevier B.V. All rights reserved.