Dear Kotaro, The microstructure-related peak broadening always increase with 2Theta (and decrease with d). In your case, I suspect, the increase of FWHM with d might be due to an instrumental contribution, as the general trend looks similar to that of the CeO2 standard.
Best regards, Leonid ******************************************************* Leonid A. Solovyov Institute of Chemistry and Chemical Technology 660036, Akademgorodok 50/24, Krasnoyarsk, Russia http://sites.google.com/site/solovyovleonid ******************************************************* ----- Original Message ----- From: Kotaro SAITO <kotaro.sa...@kek.jp> To: Radovan Cerny <radovan.ce...@unige.ch>; l_solov...@yahoo.com Cc: "Rietveld_l@ill.fr" <Rietveld_l@ill.fr> Sent: Tuesday, August 4, 2015 4:54 PM Subject: Re: Selective peak broadening - interpretation and handling in FullProf Dear Radovan and Leonid, Thanks for your comments. Both papers are very interesting and seem to contain good hints for my case. Now I am confusing when I compare peak width vs. 2th in constant wave profiles and peak width vs. d in TOF. When I plot FWHM/d vs. d, FWHM/d of all-odd peaks increases with increasing d. (Note these FWHM are obtained with multiple peak fitting with simple Gaussian.) In other words, peak broadening is large for small hkl peaks. Here is the plot. (not an attachment file!) https://www.dropbox.com/s/uzm0fv3q8ljoq5o/Layout0.pdf?dl=0 On the other hand, for example Fig.3 in Leonid’s paper (http://dx.doi.org/10.1107/S002188980000114X), peak broadening is larger for large 2th, which means large hkl peaks. If the peak broadening in my TOF data has a similar origin as two papers which Radovan and Leonid showed, is it acceptable to have such different hkl dependence between TOF and 2th data? Or do I miss some basic points about diffraction? Best regards, Kotaro //================//================// Kotaro SAITO High Energy Accelerator Research Organization Institute of Materials Structure Science 1-1 Oho, Tsukuba, Ibaraki, 305-0801, Japan //================//================//
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 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/ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
