X-ray Diffraction (XRD)






Basic Theory: Instrument Design
Instrument Design for Analysis of Powders

Let’s reexamine the simple description of Bragg’s law.  In the example shown below, diffraction is only being measured from the horizontal planes of a crystal as function of 2q. For a complete analysis of a material, the diffraction from all the possible lattice planes should be examined.

1.  Based on this above statement what do you think are important considerations in the instrumental design for XRD analysis?

2.  In Powder XRD analysis, the assumption is that all orientations are present in the sample and interact with the X-ray source simultaneously.  What effect does this have on the collection of the diffraction pattern?


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Celeste Morris, Bradley Sieve and Heather Bullen, Department of Chemistry, Northern Kentucky University, Highland Heights, KY 41099