引言(1)历史背景和目的：此处微小晶体指尺寸小于1μm,不宜用X射线单晶体衍射分析方法测定结构的晶体。电子晶体学是借助电子射线与晶体的相互作用研究晶体结构的科学。20世纪70年代初期报道了能直接观测晶体中原子团的高分辨电子显微 Introduction (1) Historical Background and Purpose: Here tiny crystals refer to the size of less than 1μm, it is not appropriate to use X-ray single crystal diffraction analysis to determine the structure of the crystal. Electron crystallography is the science of studying crystal structure by means of the interaction of electron rays and crystals. The early 1970s reported high-resolution electron microscopy that directly observed the atomic groups in the crystal