Geometry determination and refinement in the rotation electron diffraction technique

Area of Science:

• Materials Science
• Crystallography
• Electron Microscopy

Background:

• Accurate diffraction geometry is essential for quantitative analysis in electron diffraction.
• Determining parameters like beam direction and tilt is critical for precise calculations.
• Existing methods may require refinement for advanced applications.

Purpose of the Study:

• To determine and refine diffraction geometry parameters for Rotation Electron Diffraction (RED).
• To enable accurate calculation of excitation errors for Laue zones.
• To enhance the precision of structural parameter determination, particularly thermal factors.

Main Methods:

• Determination and refinement of rotation axis, incident electron beam direction, and beam tilt path.
• Utilizing Kikuchi lines from higher order Laue zones (HOLZ) for refinement.
• Comparison of experimental data with simulated results for validation.

Main Results:

• Precise determination and refinement of RED diffraction geometry parameters achieved.
• Excellent agreement between calculated and simulated results for a CoP3 crystal.
• Established methodology for incorporating refined excitation errors into theoretical and experimental analyses.

Conclusions:

• The developed methodology is indispensable for dynamical calculations in RED.
• Enhanced accuracy in structural parameter clarification, including thermal factors, is enabled.
• This work is vital for evaluating material properties, especially in thermoelectrics.