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Toward high-throughput defect density quantification: A comparison of techniques for irradiated samples.

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Summary

This study introduces an automated crystal orientation mapping (ACOM) protocol for Transmission Electron Microscopy (TEM) to efficiently identify suitable nanocrystalline (NC) grains for defect analysis, overcoming limitations of traditional imaging methods.

Keywords:
Automated crystal orientation mappingDefect densityIrradiation damageNanocrystallineTransmission electron microscopy

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Electron Microscopy

Background:

  • Transmission Electron Microscopy (TEM) is crucial for defect analysis in materials.
  • Conventional diffraction contrast techniques (bright-field, dark-field) are complex for nanocrystalline materials.
  • Nanocrystalline materials offer superior properties, necessitating effective defect investigation.

Purpose of the Study:

  • To develop and assess a protocol for identifying optimal nanocrystalline grains for TEM analysis.
  • To compare the effectiveness of automated crystal orientation mapping (ACOM) with traditional TEM imaging techniques for defect density analysis.
  • To evaluate defect densities in irradiated nanocrystalline gold (Au) using various TEM methods.

Main Methods:

  • Automated Crystal Orientation Mapping (ACOM) using NanoMegas ASTAR in TEM.
  • Conventional two-beam bright-field and weak-beam dark-field imaging.
  • Down-zone Scanning Transmission Electron Microscopy (STEM) imaging.
  • Multibeam imaging assisted by ACOM.

Main Results:

  • ACOM protocol effectively identifies optimally oriented nanocrystalline grains for quantitative analysis.
  • Comparison of defect densities across different TEM imaging techniques was performed.
  • The study assessed the practical application of various imaging methods in complex nanocrystalline microstructures.

Conclusions:

  • The ACOM-assisted multibeam imaging method offers a practical approach for defect analysis in nanocrystalline materials.
  • This protocol simplifies the identification of suitable grains, improving the efficiency of TEM defect studies.
  • The findings are essential for understanding defect morphologies in advanced nanocrystalline materials.