I. Brief introduction Several questions to ask in this course: 1. What is the objective of the course - “introduction to crystal structure and diffraction.

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Presentation transcript:

I. Brief introduction Several questions to ask in this course: 1. What is the objective of the course - “introduction to crystal structure and diffraction theory”? (a) Crystal structure (b) Diffraction theory and techniques 2. What is the atomic arrangement in a crystal? 3. What is the crystal symmetry? 4. What is the difference among reflection, refraction, and diffraction?

5. How many kinds of diffraction techniques useful for materials characterization? XRD (X-ray diffraction; bulk) --- used for bulk structure determination (in air) LEED (low energy electron diffraction; surface) --- used for surface structure determination in UHV (ultra-high vacuum) RHEED (Reflection high energy electron diffraction) --- equipped in MBE (molecular beam epitaxy, UHV, surface) TEM (Transmission electron microscope; bulk, thin) --- used for chemical and structure determination

6. What is the relationship between diffraction and image formation? --- the image of the object is contained in each diffraction spot --- diffraction focal plane and image plane

7. What are the diffraction techniques covered in the text? (a) X-ray diffraction (XRD) ---- Laue method (orientation determination) TransmissionReflection

---- Debye-Scherrer Method (crystal structure characterization) %20Detectors.pdf

---- X-ray diffractometer (structure characterization) ---- X-ray topography (microstructure characterization) Each diffraction spot enlarged is actually a topograph.

(b) Low energy electron diffraction (LEED) ---- surface structure determination LEED pattern of Si(100)2x1

(c) Reflection high energy electron diffraction (RHEED) --- used in MBE (molecular beam epitaxy) Streaky RHEED pattern of an epitaxial layer

(d) Transmission electron microscope (TEM) --- structure, morphology, and chemical determination (usually UHV, newest: liquid)