mesostructure

[alberto martinelli]

I am analyzing a nanostructured sample; its diffraction pattern shows well-formed mesostructure diffraction peaks at very low angles determined by the ordered arrangement of the nanoplatelets. I am wondering how to handle this data. I guess I cut off this low-angular region before extracting the PDF function and then compare how the PDF function changes with respect to the conversion of the total angular region (this should give information on platelets arrangment). Has anyone encountered this before?

[Simon Billinge]

Thanks for the question Alberto.  Sorry for the slow response.

You can do it either way, with or without those peaks.  When you exclude them you will get long-wavelength sine-waves in your PDF that contain information about the layer stacking in your material.

There is a pretty good description of all this here, Max's excellent review, (and in sources cited herein):

10.1021/acs.chemrev.1c00237

S

On Wed, Sep 25, 2024 at 2:51 AM alberto martinelli <alberto.m....@gmail.com> wrote:

I am analyzing a nanostructured sample; its diffraction pattern shows well-formed mesostructure diffraction peaks at very low angles determined by the ordered arrangement of the nanoplatelets. I am wondering how to handle this data. I guess I cut off this low-angular region before extracting the PDF function and then compare how the PDF function changes with respect to the conversion of the total angular region (this should give information on platelets arrangment). Has anyone encountered this before?

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Simon Billinge

Professor, 

Department of Applied Physics and Applied Mathematics

Columbia University