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首页> 外文期刊>Crystal growth & design >A rhombic dodecahedral honeycomb structure with cation vacancy ordering in a γ-Ga_2O_3 crystal
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A rhombic dodecahedral honeycomb structure with cation vacancy ordering in a γ-Ga_2O_3 crystal

机译：γ-Ga_2O_3晶体中阳离子空位有序的菱形十二面体蜂窝结构

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摘要

The crystal structure of a γ-Ga_2O_3 layer grown epitaxially on an MgO substrate by a vapor phase transport method was investigated by transmission electron microscopy, electron diffraction, and scanning transmission electron microscopy with aberration correctors. Some forbidden reflections were excited in electron diffraction patterns by double reflection from the vicinity of the substrate interface. Phase boundaries are observed in atomic column images using high-angle annular dark field images. A structure model is proposed to explain the experimental results. Cation vacancy ordering is introduced in the structure model to distort the γ-Ga _2O_3 crystal lattice along one axis and reduce the lattice mismatch with the substrate. Some grains are formed and alter the directions to reduce the distortion for the other axis. The grains are stacked with {110} phase boundaries and form a rhombic dodecahedral honeycomb. The rhombic dodecahedral honeycomb structure model with cation vacancy ordering is stabilized by the lattice mismatch between the γ-Ga_2O _3 crystal and the MgO substrate, and it disappears at a depth of 170 nm from the interface.
机译：通过透射电子显微镜，电子衍射和带有像差校正器的扫描透射电子显微镜研究了通过气相传输方法在MgO衬底上外延生长的γ-Ga_2O_3层的晶体结构。通过从基板界面附近的双反射，在电子衍射图案中激发了一些禁止反射。使用大角度环形暗场图像可在原子列图像中观察到相界。提出了一个结构模型来解释实验结果。在结构模型中引入了阳离子空位排序，以沿一个轴扭曲γ-Ga_2O_3晶格，并减少了与衬底的晶格失配。一些晶粒形成并改变方向以减小另一轴的变形。晶粒以{110}相界堆叠，并形成菱形十二面体蜂窝。阳离子空位有序的菱形十二面体蜂窝结构模型通过γ-Ga_2O_3晶体和MgO衬底之间的晶格失配而得以稳定，并且在距界面170 nm处消失。

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