Why PXRD of a material get broaden by reducing particle size, is there any change in crystallinity of the material?

06 June 2016 1 9K Report

powder xrd peak intensity

It is due to the relaxation in Bragg's condition for finite crystals. For the diffraction peaks to be a delta function, the crystal should be perfect and infinite. For finite crystals, destructive interference does not take place for angles differing slightly from the Bragg's angle, leading to a finite intensity on both sides on Bragg's angle to broaden the peaks.

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