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用电子晶体学可以确定尺度在微米甚至纳米级晶体的原子结构。它所要求的晶体尺寸比X射线晶体学所需的小百万倍。确定晶体的原子结构既可通过对高分辨电子显微像作图像处理,也可直接用电子衍射数据。同时还可将高分辨电子显微像和电子衍射数据与X射线粉末衍射结合起来确定晶体结构。如果晶体的单胞很大,原子在任何方向上的投影都有重叠,确定晶体的原子结构则需要拍摄一系列不同晶带轴的电子衍射图及高分辨像,再将其综合起来重构晶体的三维静电势图,以得到晶体的原子位置。本文将概括地介绍最近十几年中电子晶体学的一些最新进展及其在无机晶体结构解析方面的一些最新应用实例。
Using electronic crystallography can determine the atomic structure of the scale in the micron or even nanoscale crystals. The size of the crystal it requires is a million times smaller than that required for x-ray crystallography. The atomic structure of a crystal can be determined either by high-resolution electron microscopy for image processing or directly by electron diffraction data. High-resolution electron microscopy and electron diffraction data can also be combined with X-ray powder diffraction to determine the crystal structure. If the crystal unit cell is large, the projection of atoms in any direction have overlapping, to determine the atomic structure of the crystal you need to shoot a series of different crystal axis of the electron diffraction pattern and high-resolution images, and then reconstruct the crystal Dimensional electrostatic potential diagram to get the crystal’s atomic position. In this article, we will introduce some recent advances in electronic crystallography and some recent application examples in inorganic crystal structure analysis.