What does a grain boundary look like? How to see it? Any good references on this topic?

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Tekkouk Nazih

I don't understand exactly your question? give me more details, please

Tianfu Li

Is there any research that focus on characterizing the grain boundary? Maybe by TEM or Scattering methods? What do we understand about the grain boundary? Like what is the thickness of the boundary? Is the density different? How do we know about this?