Preparation Of Oxide Crystal By Chemical Vapor Reaction

In this paper, ZnO crystals were synthesized by hydrolysis method at high temperature and the effects of various chemical vapor conditions (temperature and substrate) on the size, shape and quality of ZnO crystal were studied. It was found that the high quality ZnO crystals could be synthesized on the SiC and Al₂O₃ substrates, and the best condition of temperature was from 500 to 550℃. ZnO film was obtained on the ZnO and Al₂O₃ substrates, but the crystal quality needed to be improved. The spiral epitaxy of ZnO crystal on the ZnO(0001) substrate could be observed clearly. Furthermore, the optical capability of SnO₂ and Fe₂O₃ films were studied.Moreover, Zn_1-xCo_xO crystals were synthesized by chemical vapor transport technique at 970℃. Different Co doped Zn_1-xCo_xO crystals were obtained by changing the content of Co₂O₃ in the raw material. It was found that Zn_1-xCo_xO crystals show the hexagonal feature of ZnO wurtzites, and the morphology of the crystal varied with the concentration of Co doped in Zn_1-xCo_xO.