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In powder x-ray diffraction ,as I have learnt the sample is multi-crystalline.So if x-ray is diffracted through these randomly oriented crystal grains, aren't we supposed to get a random pattern?

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    $\begingroup$ That's because no matter how you would rotate a crystal grain, it would diffract only at certain special angles. Also, welcome to Chem.SE. $\endgroup$ – Ivan Neretin Jun 21 '16 at 9:51
  • $\begingroup$ Firstly thank for your answer and warm welcome. $\endgroup$ – Titto Sunil John Jun 23 '16 at 7:35
  • $\begingroup$ Can you please describe why it is so.I am not able to visualise it. $\endgroup$ – Titto Sunil John Jun 23 '16 at 7:42
  • $\begingroup$ Check out this site for an exhaustive explanation of powder diffraction:- pd.chem.ucl.ac.uk/pdnn/powintro/powdiff.htm $\endgroup$ – m3wolf Jan 12 '17 at 7:11

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