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Related Experiment Videos

Convergent beam diffraction studies of interfaces, defects, and multilayers.

D Cherns1, A R Preston

  • 1H.H. Wills Physics Laboratory, University of Bristol, England.

Journal of Electron Microscopy Technique
|October 1, 1989
PubMed
Summary
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Large Angle Convergent Beam Electron Diffraction (LACBED) effectively analyzes crystal defects, dislocations, and multilayers. This technique precisely measures strains and composition profiles in various structures, simplifying defect analysis.

Area of Science:

  • Materials Science
  • Solid-State Physics
  • Crystallography

Background:

  • Crystal defects, bicrystals, and multilayers significantly influence material properties.
  • Accurate characterization of these structures is crucial for materials development.
  • Existing techniques may have limitations in resolving fine details or quantitative analysis.

Purpose of the Study:

  • To demonstrate the application of Convergent Beam Electron Diffraction (CBED) and Large Angle Convergent Beam Electron Diffraction (LACBED) techniques.
  • To highlight LACBED's capability in quantifying crystal defect parameters.
  • To showcase LACBED's utility in analyzing bicrystals and multilayers.

Main Methods:

  • Utilizing Convergent Beam Electron Diffraction (CBED) for crystallographic analysis.

Related Experiment Videos

  • Employing Large Angle Convergent Beam Electron Diffraction (LACBED) for detailed structural investigation.
  • Applying a simple kinematic approach for result interpretation.

    • Main Results:

    • LACBED enables determination of Burgers vectors for dislocations and displacements at stacking faults.
    • Plan-view LACBED provides rocking curves for selected reflections in bicrystals and multilayers.
    • Layer strains are measurable to approximately 0.1%, and composition profiles are derivable for periodic and aperiodic structures.

    Conclusions:

    • LACBED is a powerful technique for quantitative analysis of crystal defects, including dislocations and stacking faults.
    • LACBED facilitates precise strain and composition measurements in bicrystals and multilayers.
    • The kinematic approach offers a straightforward method for interpreting LACBED data.