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Related Experiment Videos

Quantitative Energy-filtering Transmission Electron Microscopy in Materials Science.

Grogger1, Hofer, Warbichler

  • 1Research Institute for Electron Microscopy, Graz University of Technology, Steyrergasse 17, A-8010 Graz, Austria

Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada
|April 1, 2000
PubMed
Summary

Energy-filtered transmission electron microscopy (EFTEM) provides high-resolution elemental mapping for materials science. This technique detects secondary phases, quantifies elemental concentrations, and maps chemical bonding states, aiding in material characterization.

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Physics

Background:

  • Energy-filtered transmission electron microscopy (EFTEM) offers high lateral resolution elemental distribution imaging.
  • Short acquisition times make EFTEM suitable for rapid material analysis.

Purpose of the Study:

  • To present typical materials science problems solvable with EFTEM.
  • To demonstrate EFTEM's capabilities in elemental distribution, quantification, and chemical bonding state analysis.

Main Methods:

  • Jump ratio imaging under rocking beam illumination for secondary phase detection.
  • Conversion of elemental maps to concentration maps using partial ionization cross-sections (k-factors).
  • Electron energy-loss near edge fine structure (ELNES) mapping for chemical bonding state differentiation.

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Main Results:

  • Secondary phases in steel were detected using jump ratio images.
  • Quantitative chemical phase maps were generated from atomic ratio maps correlated via scatter diagrams.
  • Diamond and non-diamond carbon were distinguished in coated materials using ELNES mapping of the C-K edge.

Conclusions:

  • EFTEM is a versatile tool for detailed materials characterization.
  • Advanced EFTEM techniques enable precise elemental quantification and chemical state analysis.
  • ELNES mapping is effective for distinguishing different allotropes of elements like carbon.