Graphite versus Quartz Monochromators

The powder diffraction patterns below are of yttria, Y2O3, annealed at 1200°C for several days, and measured on two different Bragg-Brentano diffractometers, both equipped with copper X-ray tubes.

The first data set was measured on a diffractometer equipped with a post-sample graphite monochromator. The splitting of the diffraction peaks due to the presence of Kα1 and Kα2 radiation is clearly illustrated.
The second data set was measured with another diffractometer equipped this time with a pre-sample quartz monochromator. The peaks due to the Kα2 radiation have vanished, but at a cost to the diffracted intensity.


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© Copyright 1997-2006.  Birkbeck College, University of London.
 
Author(s): Jeremy Karl Cockcroft
Martin Vickers