Regensburg 2022 – wissenschaftliches Programm
KFM 25.5: Poster
Donnerstag, 8. September 2022, 15:00–18:00, P2
Real space texture analysis using the 3D pair distribution function on a Pt thin film — •Sani Y. Harouna-Mayer1,2, ZiZhou Gong3, Martin v. Zimmermann4, Ann-Christin Dippel4, Simon J.L. Billinge2, and Dorota Koziej1,2 — 1Institute for Nanostructure and Solid-State Physics, Center for Hybrid Nanostructures (CHyN), University of Hamburg, Hamburg, Germany — 2The Hamburg Center for Ultrafast Imaging, Hamburg, Germany — 3Department of Applied Physics and Applied Mathematics, Columbia University, New York, USA — 4Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany
An approach is described for studying texture in nanostructured materials. It is demonstrated on a fiber textured polycrystalline Pt thin film. The approach uses 3D PDF methods to reconstruct the orientation distribution function (ODF) of the powder crystallites from a set of diffraction patterns taken at different tilt angles of the substrate with respect to the incident beam directly from the 3D PDF of the sample. A real space equivalent of the reciprocal space pole figure is defined in terms of interatomic vectors in the PDF and computed for various interatomic vectors in the Pt film. Further, it is shown how a valid isotropic PDF may be obtained from a weighted average over the tilt series. Finally, we describe an open source Python software package, FouriGUI, that may be used to help in studies of texture from 3D reciprocal space data, and indeed for Fourier transforming and visualizing 3D PDF data in general.