摘要
本文对作者十几年来利用高分辨电子显微学研究几种金属的初期氧化(硫化)产物的结构的成果做了概要的介绍。文中首先以分析Cu_4O为例,简要地说明了作者建立的轻原子成像法的原理。接着介绍了作者运用此法对Cu、Ni的初期氧化和Ag的初期硫化产物的研究。在对Cu_(64)O的分析中指出,利用动力散射效应实现对这种含氧量极低的初期产物中氧原子像的观测,不是在晶体的薄区域,而是在晶膜相对较厚的区域。在对Cu_4O_(0.75)的分析中指出,人们有可能不仅利用氧原子像点的几何分布,而且有可能利用像点的强弱来分析氧原子串的线密度,并推断氧原子是处于面心立方点阵的八面体空洞还是处于四面体空洞。
This paper provides a summary of the studies of a series of suboxides and subsulfides of several metals which have been carried out in the past ten more years using high resolution electron microscopy. First using Cu_4O as an example, the principle of so-called "light atom imaging method"established by the present authors is introduced. Based on this method, a series of determinations of the structures of the suboxides of Cu and Ni and subsulfide of Ag which are formed in the initial stage of oxidation and sulfidation are described. It is specially in-dicated in the study of Cu_(64)O that the observation of the oxygen atoms in such a suboxide which contains very low oxygen was realized in a thicker crystal rather than a thinner one. It is also specially indicated in the study of Cu_4O_(0.75) that there exists a possibility to apply not only the geometrical distribution of oxygen in the images but also their intensities to obtain the information concerning the line-density of oxygen in the oxygen-atomic chains and to infer that the oxygen atoms are situated at the tetrahedral or octahedral sites of the face-centred cubic lat-tice.
出处
《电子显微学报》
CAS
CSCD
1996年第2期151-164,共14页
Journal of Chinese Electron Microscopy Society
基金
国家自然科学基金
关键词
电子散射
动力学效应
电子显微术
dynamic electron diffraction light-atom imaging method nonstoicheiometrie oxides and sulphides
