Using the phase diagram of Figure 4.8: 

(a) State how you would attempt to prepare a solid polycrystalline sample of ZrW₂O₈. 

(b) State how you would attempt to grow single crystals of ZrW₂O₈.

Figure 4.8

temperature (C) 1400 1300 1200 1100 1000 900 0.0 ZrO ZrO ss tet ZrO2 ss tet + Liquid ZrO2 ss tet 2 ss tet + ZrW08 ZrO2 ss mon + ZrW Og ZrO 2 ss mon ZrW08 0.2 Liquid ZrO ss mon + WO3 0.6 0.4 mole fraction WO3 Liquid WO3 + Liquid ZrW08 + WO3 0.8 1.0 WO3