Illinois MATSE 280 Introduction to Engineering Materials, Lecture 3 Part 4: Structures via Diffusion
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Abstract
Structures via Diffraction
Goals
- Define basic ideas of diffraction (using x-ray, electrons, or neutrons, which,
although they are particles, they can behave as waves) and show how to determine: - Crystal Structure
- Miller Index Planes and Determine the Structure
- Identify cell symmetry
Learning Objective
- Know and utilize the results of diffraction pattern to get:
- lattice constant
- allow computation of densities for close-packed structures
- Identify cell symmetry
- Specify directions and planes for crystals and be able to relate
to characterization experiments
Content
- CRYSTALS AS BUILDING BLOCKS
- POLYCRYSTALS
- SIMPLE Diffraction in Crystals and Polycrystals
- Diffraction by Planes of Atoms
- Diffraction Experiment and Signal
- Crystal Structure and Planar Distances
- Allowed (hkl) in FCC and BCC for principal scattering (n=1)
- Diffraction of Single 2D Crystal Grain
- Diffraction of Multiple Single 2D Crystal Grains (powders)
- Example from Graphite
- Example from Aluminum
- Example from QuasiCrystals
- SUMMARY
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