Powder Diffraction - Spallation Neutron Source
Powder Diffraction - Spallation Neutron Source
Powder Diffraction - Spallation Neutron Source
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CW: Variation of FWHM with Q<br />
Gaussian<br />
U, V & W are Cagliotti terms, derived<br />
as instrument response function for<br />
CW neutron diffraction. Incomplete for<br />
x-rays.<br />
P is a crystallite broadening<br />
contribution<br />
G<br />
2<br />
g<br />
= U tan<br />
W<br />
+<br />
2<br />
Q + V tan Q +<br />
P<br />
cos<br />
2<br />
Q<br />
Lorentzian<br />
X is crystallite broadening<br />
Y is strain broadening<br />
X<br />
g<br />
= + Y tan Q<br />
cosQ<br />
N.B. no instrumental broadening term<br />
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