Dear All,
I am trying to do quantitative analysis using GSAS. I have to analyze some
mixtures with a known fraction of one phase. How can I constrain in GSAS one
phase fraction (weight %) to a given value, in the meantime allowing the
remaining phase fractions to vary? 
I have unsuccessfully been trying with various starting values of the phase
fraction, then switching off the refinement flag, but in the refinement the
phase fractions always converge to the (almost) same wt % values, different
(obviously, Murphy's?!) for the known phase from the expected value. Thanks
in advance for your kind attention.         
Best Regards            Natale Perchiazzi
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               Natale Perchiazzi                           
  Dipartimento di Scienze della Terra 
       Universitą degli Studi di Pisa           
     Via S.Maria 53, I-56126 Pisa        
             tel +39 050 847269                         
             fax +39 050 40976                         
      e-mail [EMAIL PROTECTED]                
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