SAED, Selected Area Electron Diffraction Pattern: A Single Vs. Poly-crystalline Material

How to interpret Selected Area Electron Diffraction (SAED) graphs and HR-TEM/SAED graphs in your research paper or thesis?
SAED gives information whether your material is mono-crystalline, poly- crystalline or amorphous.
It gives the following information about the materials (Nanostructured Materials)
i. TEM is basically a nano size characterization tool.
ii. Shape and particle size (morphology, crystallite size, grain size, particle size, lattice information, plane indices, dislocations, and diffraction patterns)
iii. Grain boundaries

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X-Ray diffraction analyses would tell you whether the material is single-crystalline or poly-crystalline. In fact, in single-crystalline material, only one peak would be present. The peak intensity of the peaks also varies from powdered sample if texture is present. Similarly, in TEM analyses, if the beam covers multiple grains, which we usually observe during the diffraction of nanocrystalline material, we get spots from different grains and it may form rings.

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