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首页> 外文会议>Proceedings vol.2003-29; Epitaxial Growth of Functional Oxides Symposium and Electrochemical Society Meeting; 20031012-17; Orlando,FL(US) >CRYSTAL CHEMISTRY OF EPITAXIAL ZnO ON (111) MgAl_2O_4 PRODUCED BY HYDROTHERMAL SYNTHESIS
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CRYSTAL CHEMISTRY OF EPITAXIAL ZnO ON (111) MgAl_2O_4 PRODUCED BY HYDROTHERMAL SYNTHESIS

机译：水热合成（111）MgAl_2O_4上表观ZnO的晶体化学

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摘要

ZnO powders and epitaxial thin films were synthesized hydrothermally in aqueous solutions of zinc nitrate and ammonia at 150℃. Powder yield and particle size varied with changes in pH. Epitaxial films were synthesized at a pH of 10.9. The films grew with a c-axis (0001) orientation on (111) MgAl_2O_4 substrates, with an in-plane orientation of MgAl_2O_4[112] ‖ ZnO[1120]. The in-plane orientation relation corresponds to a 30° rotation of the close packed oxygen directions of the two structures. A crystal chemistry model explains how this rotation converts Mg and Al sites in the spinel structure to T_+ tetrahedral sites for ZnO epitaxy. The rotation also produces two fold oxygen sites at the interface that can accommodate H~+ ions, which provide charge balance. This unique interface facilitates the growth of epitaxial ZnO on the (111) spinel with a lattice mismatch reduction from 13.6% to -1.6%.
机译：在150℃的硝酸锌和氨水的水溶液中水热合成ZnO粉末和外延薄膜。粉末的产量和粒径随pH的变化而变化。在10.9的pH下合成外延膜。膜以c轴（0001）取向在（111）MgAl_2O_4衬底上生长，并且面内取向为MgAl_2O_4 [112]‖ZnO [1120]。面内取向关系对应于两个结构的紧密堆积的氧方向的30°旋转。晶体化学模型解释了这种旋转如何将尖晶石结构中的Mg和Al位点转换为ZnO外延的T_ +四面体位点。旋转还会在界面处产生两倍的氧位，可以容纳H +离子，从而提供电荷平衡。这种独特的界面有助于（111）尖晶石上外延ZnO的生长，晶格失配从13.6％降低到-1.6％。

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