Jens,
Your effect might be more related to strain than size broadening. You
would have to check widths at various diffraction orders in a given
direction (i.e., 111, 222, 333, etc., vs 200, 400, 600, etc. for an fcc
material). If the widths increase roughly in proportion to diffraction
orde
Hiya
all
I have a bit of a
brainache for a Monday morning.
We ran a couple of
samples on a Scintag Bragg-Brentano diffractometer and found some weak
reflections that would correspond to a doubled c-axis supercell. I
was a bit wary, so I ran it on our twin mirror D8 this weekend - and fou
> do you really have the
> resolution even on
> HRPD to see the diffuse scattering between Bragg peaks at
> high Q ?
No we don't, but this is not the main point (by the way, we don't use HRPD
for PDF, it doesn't go to sufficiently short wavelengths). The main reason
to go to high Q is to avoid
And he is modest as well :-)
I have to be modest. According to the CNRS, I am a
second-class researcher...
Armel
Can anyone indicate me how must I choice the 2theta step increment and
the total experiment time of step scan DRX pattern for having a good
rietveld refinment result.
The step increment choice depends on the instrument resolution.
Determine what is your sample minimal full width at half maximum,
Bob,
This exactly what is needed when the sample is a mixture of amorphous
and crystalline components. But what happens when the material is a
single crystalline phase with some coherent defects? Don't the defect
<-> average structure correlations start to dominate, and separating
components is
