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[sdpd] Fullprof2k Problem




Dear colleagues:
    I'm use FullProf2k to refine the structure of SrLaBi3Ti4O15. When 
I use Whole Pattern Decomposition (profile matching) to withdraw the 
paramtere of profile, the parameter "Shape1" is larger than one when 
I use the model of Pseudo-Voigt (Npr=5), although the R value is 
lower than 10%. Then I use these parameters to do Rietveld 
refinement, the R value is very large. So could you please tell me 
what mean that the "Shape1" is larger than one? And how to overcome 
this problem?
ps: I dont know how to use Pearson VII function (Npr=6), the program 
alway said that "Pearson VII M-value unacceptable!"
Thank you!

Sincerely
X.Q. Liu





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