文档介绍：电子显微分析
授课教师:章晓中教授
办公室:东主楼(11区)一楼电镜实验室
Tel: 62773999
e-mail: ******@tsinghua.
清华大学精品课
教学手段
双语教学:
讲课:英文
作业、实验、考试用中文
使用多媒体和板书
教学内容课后会放在清华大学“网络学堂”上
无英文教材,有英文ppt课件和自编中文教材
推荐参考书
Why learn this course?
Question?
If we have a materials with position and we want to know its structure , phase position, what microstructural analysis technique shall we use ?
A
B
Methods of microstructure analysis
The monly used microstructure analysis methods in materials science and engineering
optical microscopy
X-ray diffraction
electron microscopy
microstructural analysis
Optical Microscopy
Advantage:
observe surface morphology
Easy to operate
Result interpretation is straightforward
Disadvantage:
Low resolution (m)
Can not position analysis and phase analysis
microstructural analysis
X-ray diffraction
Advantage:
phase analysis
High accuracy
Give position
Disadvantage:
Can not “see” image
Can not do “localized” analysis
microstructural analysis
Electron microscopy
Advantage:
High resolution:
TEM (<1Å), SEM (4Å)
Do image observation (BF, DF, HREM), structure analysis (SAD, CBED), composition analysis (EDS) and electronic structure analysis (EELS) on one instrument (TEM)
Can do analysis in very small volume (~nm3)
microstructural analysis
Electron microscopy
Disadvantage:
only give localized information
very expensive (US$:-1million)
interpretation is not straightforward
operation plex
Specimen preparation is difficult
Why learn electron microscopy
The properties of materials are mainly determined by its microstructure. By controlling the microstructure of the materials, one can make a material with the required properties.
To achieve such goal, one should first “know” the microstructure of the materials.
Electron microscopy is a method to analyses the microstructure of the materials, especially for nanomaterials and nanotechnology
Topics of this lecture
Comparison of electron microscopy with other microstructure analysis techniques
Briefly introduc