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Self-consistent atom probe tomography reconstructions utilizing electron microscopy.

David R Diercks1, Brian P Gorman1

  • 1Department of Metallurgical and Materials Engineering, Colorado School of Mines, 1500 Illinois St., Golden, CO 80401, USA.

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Summary
This summary is machine-generated.

Atom probe tomography (APT) spatial accuracy is crucial. This study uses transmission electron microscopy (TEM) to validate APT reconstructions, revealing a power law relationship between compression factor and detection efficiency for accurate material analysis.

Keywords:
Atom probe tomographyDetection efficiencyImage compression factorReconstructionTransmission electron microscopy

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Analytical Chemistry

Background:

  • Atom probe tomography (APT) is vital for analyzing nanometer-scale compositional variations in materials.
  • The spatial accuracy of APT reconstructions directly impacts the validity of scientific conclusions.
  • Transmission electron microscopy (TEM) offers complementary imaging capabilities.

Purpose of the Study:

  • To investigate the use of pre- and post-analysis TEM images to enhance APT reconstruction accuracy.
  • To explore the consistency between input parameters and output reconstructions in APT.
  • To identify relationships governing reconstruction accuracy in APT.

Main Methods:

  • Utilizing transmission electron microscopy (TEM) images alongside atom probe tomography (APT) data.
  • Examining various material samples to assess reconstruction consistency.
  • Analyzing the correlation between input reconstruction parameters (e.g., image compression factor, detection efficiency) and output spatial accuracy.

Main Results:

  • Demonstrated the possibility of achieving APT reconstructions perfectly consistent with input parameters and known values.
  • Identified a universal power law relationship between image compression factor and detection efficiency across different materials.
  • Showcased that unconstrained compression factor or detection efficiency leads to a range of accurate reconstructions, but constraining one determines the other.

Conclusions:

  • TEM-constrained APT analysis improves the reliability of nanometer-scale compositional measurements.
  • The discovered power law provides a critical constraint for optimizing APT reconstruction protocols.
  • Independent assessment of either compression factor or detection efficiency allows for accurate determination of the other, enhancing APT data interpretation.