Thanks.
I am not refining U,V, W, X &/or Y. These parameters are fixed and were
obtained by refining a standard, following the tutorial.
Thanks, these comments are very valuable.
Angeles
l 11/02/2021 a las 16:47, Toby, Brian H. escribió:
Hi Angeles,
GSAS-II limits the size value to 10 microns. That size produces no observable
broadening even with the highest resolution powder diffraction data. If your
value refines to this limit, then your refinement is not showing size
broadening with the instrument parameters you are using.
If you are refining instrument parameters (U,V, W, X &/or Y) and the size
parameter: don’t! You can only fit one set or the other.
If you are not refining U,V, W, X &/or Y, how did you get these values? Are
they reasonable? If they produce peaks that are too wide, then size will refine to
be large (and microstrain small) to avoid adding even more broadening.
If you have reasonable instrument parameters and are refining both size and
microstrain, then this can be an indication that all sample broadening is in
the form of microstrain and you should fix the size at any large value and not
refine it.
Brian
On Feb 11, 2021, at 9:13 AM, M. Angeles Gomez de la Torre via GSAS-II
<gsas-ii@aps.anl.gov> wrote:
Dear all,
I am using GSAS II to do quantitative phase analysis.
When refinining size, with isotopric domain size model and LGmix =1.0,
sometimes in some phases the value converged to 10 and it is fixed.
What that this mean?
Thanks in advance
Angeles
--
Dr. M. Ángeles Gómez de la Torre
Profesora Titular de Universidad
Dpt. Química Inorgánica, Cristalografía y Mineralogía
Facultad de Ciencias, Universidad de Málaga
Campus de Teatinos 29010 Málaga
Telf: +34 952131877
Fax: +34 952131870 / +34 952132000
https://sites.google.com/view/angelesgdelatorre/
https://sites.google.com/view/cementscience-uma/home
Skype: angelesgt
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--
Dr. M. Ángeles Gómez de la Torre
Profesora Titular de Universidad
Dpt. Química Inorgánica, Cristalografía y Mineralogía
Facultad de Ciencias, Universidad de Málaga
Campus de Teatinos 29010 Málaga
Telf: +34 952131877
Fax: +34 952131870 / +34 952132000
https://sites.google.com/view/angelesgdelatorre/
https://sites.google.com/view/cementscience-uma/home
Skype: angelesgt
_______________________________________________
GSAS-II mailing list
GSAS-II@aps.anl.gov
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