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Atom Probe Tomography Analysis of Exsolved Mineral Phases
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Interpreting atom probe data from chromium oxide scales.

Alexandre La Fontaine1, Baptiste Gault2, Andrew Breen1

  • 1School of Aerospace, Mechanical, Mechatronic Engineering, The University of Sydney, NSW 2006, Australia; Australian Centre for Microscopy and Microanalysis, The University of Sydney, NSW 2006, Australia.

Ultramicroscopy
|March 23, 2015
PubMed
Summary
This summary is machine-generated.

Picosecond-pulsed ultraviolet laser atom probe tomography (APT) effectively analyzes protective chromium oxides on stainless steel. A new "laser sensitivity factor" quantifies laser energy

Keywords:
Atom probe tomographyCorrosionField evaporationOxides

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Area of Science:

  • Materials Science
  • Surface Science
  • Analytical Chemistry

Background:

  • Thermally grown chromium oxides are crucial protective layers on stainless steel.
  • Atom probe tomography (APT) is a powerful technique for nanoscale chemical analysis.
  • Understanding APT parameters is essential for accurate material characterization.

Purpose of the Study:

  • To investigate the influence of analysis parameters on APT of chromium oxides.
  • To quantify the effect of laser energy on thermal tails and chemical composition.
  • To explore molecular ion dissociations in chromia during APT.

Main Methods:

  • Utilized picosecond-pulsed ultraviolet (UV-355 nm) laser-assisted APT.
  • Analyzed protective, thermally grown chromium oxides on stainless steel.
  • Investigated the impact of laser energy, base temperature, and pulse frequency.

Main Results:

  • Introduced a 'laser sensitivity factor' to quantify laser energy's effect on thermal tails.
  • Demonstrated the parameter's utility in comparing chromia and chromite samples.
  • Observed the influence of laser energy, base temperature, and pulse frequency on mass spectra and oxygen content.

Conclusions:

  • The 'laser sensitivity factor' provides a novel metric for APT parameter optimization.
  • Optimized APT parameters are critical for accurate analysis of chromium oxide protective layers.
  • Preliminary insights into molecular ion dissociation mechanisms in chromia were gained.