I don't think that varying the step size is particularly useful. The
FWHM usually increases with angle for sure, but so does the number of
peaks per degree, so you want the finest step to stand a chance of
seeing any subtleties in the profile due to overlapping peaks. I think
it's more useful to increase the counting time to counteract the
reduction in scattering power with angle.
Andy
On 04/04/2022 11:28, francois Goutenoire wrote:
Dear Rietveld users,
I am currently looking for a reference for the strategy of collecting
XRD data on lab diffractometer.
With the help of new diffractometers we can collect the data in the
VCT (Variable Counting Time).
This last method has been studied by IC Madsen and RJ Hill (1994).
Now we can also collect the data with different step size for a long
two theta range (example : from 5 to 150 two theta) with some
different steps size depending of the FWHM evolution (example 0.013 /
0.026 and 0.039).
After the data can be easily modified to get the 0.013 step
(HighScorePlus).
Is there any good paper about this VCT -VSS (Variable Step Size)
methodology ?
Best wishes, Francois
--
*********************************************************************************************
Pr. Francois GOUTENOIRE
e-mail:francois.gouteno...@univ-lemans.fr
Tel: 02.43.83.33.54
FAX: 02.43.83.35.06
Institut des Molécules et des Matériaux du Mans
IMMM - UMR CNRS 6283
Elaboration et Caracterisation des Composés Cristalisés (E3C)
Université du Maine - Avenue Olivier Messiaen
F-72085 Le Mans Cedex 9
FRANCE
*********************************************************************************************
Formation Rietveld CNRS
https://cnrsformation.cnrs.fr/diffraction-des-rayons-x-sur-materiaux-polycristallins?axe=135
Formation EDX CNRS
https://cnrsformation.cnrs.fr/fluorescence-x-edx?axe=135
Formation SAXS et Réflectivités pour couches minces et matériaux nanostructurés.
https://cnrsformation.cnrs.fr/caracterisation-des-materiaux-nanostructures-par-diffusion-des-rayons-x?axe=135
Bibliographie
https://scholar.google.fr/citations?hl=fr&user=qC-lmN4AAAAJ&view_op=list_works&authuser=1&sortby=title
https://orcid.org/0000-0001-5339-3002
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