Dear Alberto,
>From my experience, negative Biso or Boverall values may indicate that
microabsorption effect was ignored. You may attempt to refine Cp and
tau. Example is follow:
__________________________________________________________________
9 !Number of refined parameters
!
! Zero Code Sycos Code Sysin Code Lambda Code MORE ->Patt# 1
-0.0362 11.00 0.00000 0.00 0.00000 0.00 0.000000 0.00 1
!
! Microabsorption coefficients for Pattern# 1
! P0 Cod_P0 Cp Cod_Cp Tau Cod_Tau
0.0000 0.00 1.8553 0.00 0.0423 0.00
____________________________________________________________________
Cheers,
Vyacheslav
__________________________________________________________________
Wednesday, November 24, 2004, 12:24:14, you wrote:
AM> Dear all,
AM> I've got a problem with the Rietveld refinements of synchrotron data.
AM> I'm using Fullprof and the problem is that the overall B, and then also
AM> some of the isotropic displacement parameters, fall down to negative
AM> values. I'm not very experienced in the treatment of synchrotron data and
AM> may be I put some errouneous input in the PCR file, but I cannot understand
AM> what.
AM> Thanks in advance for your helpful suggestions, best regards
AM> Alberto Martinelli
--
Best regards,
Vyacheslav mailto:[EMAIL PROTECTED]
