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

Researchers should cite this work as follows:

• Duane Douglas Johnson; Omar N Sobh (2008), "Illinois MATSE 280 Introduction to Engineering Materials, Lecture 3 Part 4: Structures via Diffusion," http://nanohub.org/resources/5492.

  BibTex | EndNote

1. course lecture
2. diffusion
3. Illinois
4. material properties
5. materials
6. material science
7. nanobio applications