[sdpd] peak shifting

["s_ferdol" <s_ferdol...@yahoo.com>]

Dear all,

I am using FullProf to refine a silicate with apatite type of 
structure. The problem is that after the complete refinement and 
getting pretty good R factors and physically reliable values when I 
generate the final structure in PowderCell and than load the 
experimental powder X-ray pattern there is no complete matching between 
the two diffractograms. In fact there is a peak shifting and the 
experimental settings for both patterns are the same. Has somebody had 
such a problem and what could be the explanation of it.

Many thanks in advance

Stanislav






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