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Dear all,
I have some questions concerning the refinement of
the gppd data and would appreciate your advice:
1) The patterns show some kind of texture(up and
down on the error curve), but the sample is powder(although maybe the granules
are large) and should be isotropic. All banks show this characteristic texture
behavior.
2) For different banks, the sign of error for the
same (hkl) gradually reverse, and it's hard to refine.
3) If UISO factors are let free, the refinement
will go bad, even if they are constrained.
4) For one series of sample, the peaks are really
sharp, the error sign is always like -/+/-, the positive error is very big and
sharp.
5) There are some small peaks, which may be due to
martensitic transformation. But they are really small, i don't know to what
degree i should trust these data. Somebody said maybe that's due to
contamination. If it is martensitic trans., how can i set a proper model to
refine the data?
Sincerely,
Ling Yang
PhD student in Dr. Wang's group 701 Scarboro Rd Oak Ridge, TN 37830 Tel: 865 574 0337 Fax: 865 241 5177 |
