Recently, the efforts in solid-state materials include developing technologies capable of producing ZnO wafers in large dimensions and good quality based device applications. High quality bulk crystals are obtained by growing from high purity the melt. However, the thermochemical properties of ZnO (high melting point and high vapor pressure) make the growth of single crystals difficult. The thermodynamic calculations show that ZnO crystals can be grown from the melt if a suitable dynamic atmosphere composition is used. The oxygen requirement with increasing the temperature can be fulfilled by adding the NO-NO 2 gases into the CO 2 atmosphere. At ZnO melting point, the oxygen partial pressure of gas mixtures containing CO 2 -NO-CO-NO 2 at Pt = 5 atm reaches to PO 2 = 0.29 atm. According to this new thermody namic result, it would be expected that ZnO crystal could be grown from the melt at lower total pressure comparing to pure CO 2 .
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