[GSAS-II] *****SPAM*****about overfitting issue

[Park Gyuchul]

Hi,

I am working on the Rietveld refinement using GSAS-ll in order to get lattice parameter and phase fraction of the phases observed. However, when I conduct the refinement, I got some peaks, calculated based on the crystal structure in the cif file, even though the peaks are not observed from the sample evaluated. I think it affects the lattice parameter and phase fraction (the intensity of these peaks is not high compared to the main peaks). I am wondering about how I can solve this "overfitting" problem. I was thinking about excluding the specific 2theta region where the peaks, appearing based on the crystal structure in the cif file, are located, but I am not sure if it is possible. I would appreciate for any help on this problem.

Thanks.

Sincerely,

Purdue University
Gyuchul Park
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