Subsolidus phase relationships in the system ZnO―V2O5―WO3 research on suitable flux for ZnO crystal growth

The subsolidus phase relations of the ternary system ZnO-V2O5-WO3 was investigated by means of X-ray 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 Zn4V2O9-ZnWO4 pseudo-binary system from 740 deg C to 1300 deg 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 deg C and eutectic point component was 78 mol% Zn4V2O9 and 22 mol% ZnWO4. The compounds composed of 78 mol% Zn4V2O9 and 22 mol% ZnWO4 might be suitable flux for ZnO crystal growth.