Direct observation of oxygen atoms in rutile titanium dioxide by spherical aberration corrected high-resolution transmission electron microscopy
Direct observation of oxygen atoms in rutile titanium dioxide by spherical aberration corrected high-resolution transmission electron microscopy
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DOI：
10.1088/0957-4484/17/15/056
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发表时间：
2006-08
期刊：
影响因子：
3.5
通讯作者：
Kenta Yoshida;T. Kawai;T. Nambara;S. Tanemura;K. Saitoh;N. Tanaka
中科院分区：
文献类型：
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作者：
Kenta Yoshida;T. Kawai;T. Nambara;S. Tanemura;K. Saitoh;N. Tanaka
我们已经开发了一种球差校正透射电子显微镜（Cs校正TEM）技术，使我们能够获得更清晰的图像在真实的空间比以往任何时候都。我们将这种技术应用于氧化钛，其中氧等轻元素由于其截面小和电子损伤而难以使用TEM观察。在本研究中，我们成功地观察到在金红石型TiO 2的氧原子。此外，这种对氧原子的直接观察使我们能够研究由氧空位引起的Magnéli结构（TinO2n−1）。这些空位引起钛和氧原子的原子弛豫。弛豫原子形成了金红石型二氧化钛相的特征剪切结构。Magnéli结构（TinO2n−1）的这种剪切结构以0.119 nm的空间分辨率可视化。同时，获得了缺陷结构的选区衍射（SAD）图。在金红石[110]斑点内显示了额外的斑点。我们制作了剪切结构的结构模型，并使用多切片模拟来模拟衍射图案和图像。模拟衍射图案中的附加斑点精确地重建了实验数据。我们还考虑了使用球差校正的透射电子显微镜的局部结构的实空间分析的可能性。
We have developed a spherical aberration corrected transmission electron microscopy (Cs-corrected TEM) technique that allows us to obtain clearer images in real space than ever before. We applied this technique to titanium oxide, in which light elements such as oxygen are difficult to observe using TEM because of its small cross section and electronic damage. In the present study, we successfully observed oxygen atoms in rutile TiO2. In addition, this direct observation of oxygen atoms enabled us to study the Magnéli structure (TinO2n−1), which is caused by oxygen vacancies. These vacancies caused an atomic relaxation of the titanium and oxygen atoms. The relaxed atoms formed a characteristic shear structure of rutile titanium dioxide phase. This shear structure of the Magnéli structure (TinO2n−1) was visualized with a spatial resolution of 0.119 nm. At the same time, the selected area diffraction (SAD) pattern of the defect structure was obtained. Additional spots were shown inside the rutile [110] spot. We made structural models of the shear structure and simulated the diffraction pattern and images using a multi-slice simulation. Additional spots in the simulated diffraction patterns accurately reconstructed the experimental data. We also considered the possibility of the real-space analysis of local structures using spherical aberration corrected transmission electron microscopy.