The Rietveld-QPA doesn’t require RIR, as the peak intensities of phases are calculated from the structure models. What do you mean under “doing Rietveld” and ”structural files” in your case?
******************************************************* Leonid A. Solovyov Institute of Chemistry and Chemical Technology 660036, Akademgorodok 50/24, Krasnoyarsk, Russia http://sites.google.com/site/solovyovleonid ******************************************************* ----- Original Message ----- From: "Chrysochoou, Maria" <mchry...@engr.uconn.edu> To: "rietveld_l@ill.fr" <rietveld_l@ill.fr> Cc: Sent: Wednesday, April 2, 2014 4:21 PM Subject: Reference Intensity Ratio of clay minerals Hello, I am wondering why the RIR of clay minerals such as vermiculite and montmorillonite is so high in the structural files (e.g. around 22-28). I am not a crystallographer, but I have noticed that high RIRs are usually associated with dense structures and heavy elements and neither is the case with clays. And for example, kaolinite and illite have much lower RIRs, 1 and 0.5, even though the structures are not that much different. This results in very very low concentrations when doing Rietveld, even though there is substantial intensity associated with vermiculite and it does not make intuitive sense to me. I would appreciate any insight into this question. Thank you, Maria Chrysochoou Associate Professor Department of Civil and Environmental Engineering University of Connecticut ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 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/ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
