>But if you refine the full data with the same model, can there really be any >fundamental difference, if in one case you simply do a Fourier transform to real >space ?
Thanks to Stefan Bruehne for providing an obvious (in retrospect :-) answer i.e. that in Rietveld refinement we throw away the non-Bragg peak data, where-as with PDF all scattering is included. He quoted an example where PDF shows a split peak in Ga(1-x)In(x)As for Ga-As and In-As distances, where Rietveld refinement always gives the average (Ga,In)As structure. Alan. Alan Hewat, ILL Grenoble, FRANCE <[EMAIL PROTECTED]> fax (33) 4.76.20.76.48 (33) 4.76.20.72.13 (.26 Mme Guillermet) http://www.ill.fr/dif/AlanHewat.htm ___________________________________________________________
