Crystal Research and Technology
Cryst. Res. Technol. 38, 429 (2003) - Abstract -

Asymmetric twinning crystals of Zinc oxide formed in a hydrothermal process

HaiYan Xu, Hao Wang , YongCai Zhang, Shu Wang, ManKang Zhu, Hui Yan

The Key Laboratory of Advanced Functional Materials of China Education Ministry, Beijing University of Technology, Beijing 100022, China

Keywords    zinc oxide, hydrothermal method, asymmetric shape

Well crystallized ZnO powders with various morphologies such as hour glass-shaped, shortened prismatic, flake-like and prismatic form have been synthesized by adopting the system of Zn(Ac)2-KOH-H2O via a hydrothermal process at 200°C for 2 h. It was found that the as-synthesized hour glass-shaped ZnO crystallites are asymmetric both in shape and stoichiometry: while the atomic ratio of O/(Zn+O) at the bigger end ranges from about 60% to 40% along the polar axis of the hour glass-shaped ZnO crystallites, the atomic ratio of O/(Zn+O) at the smaller end remains almost constant at approximately 50%.



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