What does average crystallite size mean in Scherrer method?

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Gerhard Martens

"Scherrer method (using FWHM) gives the ratio of the root-mean-fourth-

power to the root-mean-square value of the thickness"

Please see page 17 (How is Crystallite Size Defined) of the following link:

https://www.google.de/url?sa=t&rct=j&q=&esrc=s&source=web&cd=16&ved=2ahUKEwiNw_ScsubiAhUMyKQKHXmFBakQFjAPegQIARAC&url=http%3A%2F%2Fprism.mit.edu%2Fxray%2Foldsite%2FCrystalSizeAnalysis.pdf&usg=AOvVaw3Zi7yDQNgcKKZ65jtiYFoj;

but sorry, I do not know the original reference

Tapash Chandra Paul

Thanks Gerhard Martens for your answer.

V R Arun Prakash

I agree Gerhard Martens answer