Crystallite XRD vs. Liquid/Amorphous/Polymer XRD

For crystalline solid, the curve of scattered intensity vs. 2θ is almost zero everywhere except at certain angles where sharp peaks occur. Here, at these particular angles, the Bragg’s law, λ = 2dsinθ satisfied, and PEAKs appeared.
Liquid, Amorphous or Polymer solids structures are characterized by an almost complete lack of periodicity and a tendency to "order" only in the sense that the atoms are tightly packed together and show a statistical preference for a particular interatomic distance; the result is an x-ray scattering curve showing nothing more than one or two broad maxima.

[@artooof]

Big thanks 😊 🙏 ☺️

[@qamarwali]

Welcome.