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Characterization of Ultra-fine Grained and Nanocrystalline Materials Using Transmission Kikuchi Diffraction
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Identification of Kikuchi lines in electron diffraction patterns collected in small-angle geometry.

Zbigniew Mitura1, Grzegorz Szwachta2, Łukasz Kokosza1

  • 1Faculty of Metals Engineering and Industrial Computer Science, AGH University of Krakow, al. Mickiewicza 30, 30-059 Krakow, Poland.

Acta Crystallographica. Section A, Foundations and Advances
|November 30, 2023
PubMed
Summary

Digital image processing significantly enhances the visibility of Kikuchi features in reflection high-energy electron diffraction (RHEED) patterns. This method aids in analyzing surface structures by revealing previously obscured Kikuchi effects.

Keywords:
Kikuchi patternsRHEEDdigital imagesnanostructured materialsperovskitesreflection high-energy electron diffraction

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Area of Science:

  • Materials Science
  • Surface Science
  • Crystallography

Background:

  • Reflection high-energy electron diffraction (RHEED) is a surface-sensitive technique used for analyzing crystal structures.
  • Kikuchi features in RHEED patterns, arising from incoherent electron scattering, typically remain hidden within the background intensity.
  • These features, caused by thermal vibrations, contain valuable information about near-surface atomic arrangements.

Purpose of the Study:

  • To demonstrate that digital image processing can substantially improve the visibility of Kikuchi features in RHEED patterns.
  • To present a method for enhancing the analysis of surface structures using RHEED.
  • To propose and discuss a simplified analytical approach for describing filtered Kikuchi patterns.

Main Methods:

  • Application of digital image processing software to filter raw RHEED patterns.
  • Collection of RHEED data for strontium titanate (SrTiO3) with mixed surface termination at various incident electron beam azimuths.
  • Development of a simplified analytical model for filtered Kikuchi patterns.

Main Results:

  • Kikuchi features become clearly visible after applying digital filtering techniques to RHEED patterns.
  • Enhanced Kikuchi patterns were demonstrated for SrTiO3 with mixed surface termination.
  • The study shows examples of both raw and processed RHEED patterns for thin films.

Conclusions:

  • Digital image processing is an effective method for enhancing the visibility of Kikuchi features in RHEED.
  • This technique allows for easier recognition and analysis of Kikuchi effects, providing valuable surface structural information.
  • The proposed analytical approach aids in the theoretical understanding of filtered Kikuchi patterns.