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Related Experiment Videos

Primitive unit cell volumes obtained from unindexed convergent-beam electron diffraction patterns.

Y Le Page1, D A Downham

  • 1Institute for Environmental Chemistry, NRC, Ottawa, Canada.

Journal of Electron Microscopy Technique
|August 1, 1991
PubMed
Summary

Calculating primitive cell volume from electron diffraction patterns simplifies phase identification. This method uses high-order Laue zones and zero-order Laue zone measurements, aiding in quickly ruling out incorrect phases.

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Area of Science:

  • Crystallography
  • Materials Science
  • Electron Microscopy

Background:

  • Multiple reflections are common in electron diffraction from microcrystallites.
  • Accurate phase identification is crucial in materials science.

Purpose of the Study:

  • To develop a method for calculating primitive cell volume from a single electron diffraction pattern.
  • To simplify and accelerate phase identification using crystallographic data.

Main Methods:

  • Utilizing convergent-beam electron diffraction (CBED) patterns.
  • Measuring diameters of high-order Laue zones (HOLZ).
  • Measuring vectors and angles in the zero-order Laue zone (ZOLZ).

Main Results:

  • A single CBED pattern allows for primitive cell volume calculation.

Related Experiment Videos

  • The calculated volume serves as an objective criterion for phase identification.
  • The CELVOL computer program facilitates these calculations.

    • Conclusions:

    • Primitive cell volume calculation from CBED is an efficient method for phase identification.
    • This approach rapidly eliminates incorrect phase possibilities.
    • The CELVOL program is available for practical application.