The reason may be in the absorption (as noted by Alan Hewat) for capillary samples or in the surface roughness effect for flat samples.
*******************************************************Leonid A. Solovyov Institute of Chemistry and Chemical Technology 660036, Akademgorodok 50/24, Krasnoyarsk, Russia http://sites.google.com/site/solovyovleonid ******************************************************* ________________________________ From: Rachid Abkar <rachid.ab...@gmail.com> To: rietveld_l@ill.fr Sent: Sunday, November 2, 2014 1:08 AM Subject: isotropic displacement parameter The Biso isotropic displacement parameter of each element in my refinement using fullprof is over 3 and negative ? but my refinement looks good and Rwp is only 9 could anybody give me some advice Thanks sincerely ABKAR RACHID ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Please do NOT attach files to the whole list <alan.he...@neutronoptics.com> Send commands to <lists...@ill.fr> eg: HELP as the subject with no body text The Rietveld_L list archive is on http://www.mail-archive.com/rietveld_l@ill.fr/ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Please do NOT attach files to the whole list <alan.he...@neutronoptics.com> Send commands to <lists...@ill.fr> eg: HELP as the subject with no body text The Rietveld_L list archive is on http://www.mail-archive.com/rietveld_l@ill.fr/ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
