Question

What is the difference between crystallite size, grain size, and particle size?​

Answer 1

Answer:

Grain size usually refers to the average diameter of the individual crystal orientations found in poly-crystalline materials. ... Particle size refers to (again generally) the average diameter of a discrete piece of material, rather than a region in a material with a distinct crystal orientation.

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Answer 2

Crystallite size is the smallest - most likely single crystal in powder form. The crystallite size commonly determined by XRD. Grain is either a single crystalline or polycrystalline material, and is present either in bulk or thin film form. ... Therefore, particle is under no circumstances smaller than crystallite size.