Electron Diffraction for various materials

  1. Load the TEM sample
  2. Capture the appropriate pattern from the certain portion of the bright field image.
  3. Observe the symmetry of crystal from various orientations. Note that you will have to index the zone axis later. Here you can only capture the diffraction patterns.
  4. Ensure that a single crystal is in view, otherwise overlapping diffraction patterns will be obtained.
  5. For a poly-crystalline material (usually nanocrystalline) will elicit a ring pattern. As the crystals are aligned in all the directions, the orientation correlation (or estimation of zone axis) will not be possible.
  6. For an amorphous material only a halo around the central beam is obtained as there is no symmetry available for diffraction.