Nature and structure of sub-nanometer defects in metal oxides by complex electron spectro-microscopy

该项目旨在开发一种用于探索固体电子结构的复杂电子光谱仪TEM，并将其应用于表征金属氧化物和陶瓷材料中由几个到几百个原子组成的缺陷尘埃。结果，我们取得了以下成就：1.仪器开发1.1用于阴极射线发光检测的新型TEM样品保持器的开发1.2掠入射结构的波长色散X射线分析光谱仪的开发1.3 TEM中的空心锥照明系统的设备2.电子光谱学的新分析方法的开发2.1扩展能量损失精细结构的高级分析（反向蒙特卡罗分析，时间分辨测量，小波变换介绍）2.2涨落电子显微术提取无序结构的中程有序2.3第一性原理对边缘结构附近能量损失的理论模拟量子化学计算2.4纳米压痕和有限元相结合的方法的发展，用于测量辐照下陶瓷的力学性能3.应用3.1检测非常小的缺陷簇和杂质氧缺陷复合物的结构分析3.2表征气体离子辐照诱导的陶瓷表面气泡3.3氢化纳米结构石墨中的氢分析3.4分析汽车尾气净化催化剂中助剂陶瓷电子结构的研究

This project aims to develop a complex electron spectroscope TEM for exploring the electronic structures of solids and to apply it to characterize defect dusters consisting of a few to hundreds atoms in metal oxides and ceramic materials. As results we obtained the following achievements :1.Instrumental development1.1 Development of a new TEM specimen holder for detecting cathodoluminescence1.2 Development of wavelength dispersive x-ray analysis spectrometer with grazing incidence configuraion1.3 Equipment with hollow-cone illumination system in TEM2.Development of new analytsis methods for electron spectroscopy2.1 Advanced analysis of extended energy loss fine structure (Reverse Monte Carlo analysis, time-resolved measurements, introduction of wavelet transformation)2.2 Extraction of medium range order of disordered structures by fluctuation electron microscopy2.3 Theoretical simulations of energy loss near edge structure by first principle quantum chemistry calculations2.4 Development of combined method of nanoindentation and finite element method for measuring mechanical properties of ceramics under irradiation3.Applications3.1 Detection of very small defect clusters and structural analysis of impurity oxygen defect complex3.2 Characterization of gas ion irradiation induced blisters on ceramics surfaces3.3 Analysis of hydrogen in hydrogenated nanostructured graphite3.4 Analysis of electronic structures of promoter ceramic in catalysis for purifying automotive gas emission