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Transmission scanning electron microscopy: Defect observations and image simulations.

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New scanning electron microscope (SEM) capabilities using a scanning transmission electron microscopy (STEM) detector enable clearer defect characterization. This technique, transmission scanning electron microscopy (TSEM), reduces interference, improving imaging of dislocations and stacking faults.

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Area of Science:

  • Materials Science
  • Electron Microscopy
  • Solid State Physics

Background:

  • Conventional transmission electron microscopy (TEM) faces limitations in defect characterization due to interference effects.
  • Scanning electron microscopy (SEM) offers potential for advanced materials analysis.
  • Strontium titanate, nickel-base superalloys, and cobalt-base materials are critical in various industrial applications.

Purpose of the Study:

  • To evaluate the defect characterization capabilities of a field emission gun scanning electron microscope (FEG-SEM) equipped with a scanning transmission electron microscopy (STEM) detector.
  • To compare imaging modes and performance against conventional transmission electron microscopy (CTEM).
  • To explore the advantages of transmission scanning electron microscopy (TSEM) for analyzing crystalline materials.

Main Methods:

  • Utilized a FEG-SEM with a STEM detector for parallel imaging with TEM.
  • Investigated stacking faults and dislocations in strontium titanate, a nickel-base superalloy, and a cobalt-base material.
  • Simulated defect images using a scattering matrix formulation for the TSEM configuration.

Main Results:

  • TSEM imaging, utilizing a convergent probe, significantly reduces interference effects like thickness fringes and bending contours compared to CTEM.
  • Individual defects are imaged clearly in high dislocation density regions.
  • Demonstrated comparable and advantageous defect imaging capabilities to TEM, with reduced interference.

Conclusions:

  • The FEG-SEM with a STEM detector, operating in TSEM mode, provides enhanced capabilities for defect characterization.
  • TSEM offers significant advantages for high-throughput and dynamic in-situ characterization of materials.
  • This technique improves clarity in imaging defects, even in complex microstructures.