Dear all,
I would like to send you my witness related to this kind of observation.
I can assure that our Bruker D8 is clean and optimized!
In many cases of well conditioned thin film (spin coating or controlled
diffusion) material this kind of phenomenon is visible around the
highest reflection, especially when the preferred orientation is
drastically present.
So, in my opinion, Reinhard and Alan are right, and what is observed is
just like reflections broadening, asymmetry, shifting ...etc ... and can
be related to the material behavior.
Now, what is the physical (crystallographic!) property responsible of
this phenomenon? let's open the floor for a large discussion.
Habib
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