Dear Apu, As the 2nd peak seems to be broader than the 1st one, the broadening is most probably due to the stacking faults, typical for the close-packed metals. The asymmetry and complexity of the broadening might also suggest the presence of crystallites with different degree of faulting (and/or size). Among DDM ( http://sites.google.com/site/ddmsuite ) examples there is a model for Cu ( \DDM195d\EXAMPLES\Defects\Cu.ddm ), accounting for the influence of faults on both peak broadening and intensities. It may also be applicable to Ni, but in this particular case a two-phase model might be necessary to allow for the presence of different crystalline fractions.
Best regards, Leonid ******************************************************* Leonid A. Solovyov Institute of Chemistry and Chemical Technology 660036, Akademgorodok 50/24, Krasnoyarsk, Russia http://sites.google.com/site/solovyovleonid ******************************************************* ________________________________ From: Apu Sarkar <apusar...@gmail.com> To: "rietveld_l@ill.fr" <rietveld_l@ill.fr> Sent: Monday, June 15, 2015 12:59 PM Subject: Peak assymtery not able to fit Hi, I am working on a nanocrystalline Nickel sample. I am not able to fit the peaks to get FWHM and Integral Breadth. Please see the attached images. Fig. 1 shows the profile and a zoomed view of a peak. Tail part of the peak is broader. Fig. 2 shows the winplotr fit. It is not matching the max intensity. Please give you suggestions to get a better fit for this kind of XRD peak. Thanks Apu ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 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/ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
