本文以新合成的化合物 CsE_u I_s 晶体结构的测定为例说明:由于电子衍射图可以提供晶体二维反点阵矢量的信息,在 X 射线粉末法难以唯一确定晶体结构时,有助于此问题的解决。在得不到合适的单晶的情况下,采用 X 射线粉末法和电子衍射来确定未知晶体的结构是一可取的途径。 In this paper, the crystal structure of the newly synthesized compound CsE_u I_s is taken as an example to illustrate that since the electron diffraction pattern can provide information about the two-dimensional inverse lattice vector, it is difficult to determine the crystal structure uniquely by the X-ray powder method solve. In the absence of a suitable single crystal, the use of X-ray powder diffraction and electron diffraction to determine the structure of an unknown crystal is a desirable approach.