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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