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Atom Probe Tomography: a Local Probe for Chemical Bonds in Solids.

Oana Cojocaru-Mirédin1,2, Yuan Yu1, Jan Köttgen1

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Advanced Materials (Deerfield Beach, Fla.)
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Atom probe tomography can now quantify chemical bonds in solids. By analyzing bond rupture events, this technique distinguishes metallic, covalent, and metavalent bonds, enabling new material design.

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atom probe tomographybond breakingchalcogenidesfield penetration depthmetavalent bondingprobability of multiple events

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Area of Science:

  • Materials Science
  • Surface Science
  • Analytical Chemistry

Background:

  • Atom probe tomography (APT) is a powerful technique for elemental analysis of solids at atomic resolution.
  • Understanding chemical bonding is crucial for materials science and engineering.
  • Current methods for characterizing chemical bonds at the nanoscale are limited.

Purpose of the Study:

  • To review and discuss the potential of atom probe tomography for probing chemical bonds.
  • To demonstrate the ability of APT to distinguish different types of chemical bonds based on bond rupture mechanisms.
  • To introduce a new approach, bonding probe tomography (BPT), for nanoscale bond quantification.

Main Methods:

  • Review of laser-assisted field evaporation processes in APT.
  • Analysis of the probability of molecular ions (PMI) and probability of multiple events (PME) during field evaporation.
  • Correlation of PME and PMI values with different bond types (metallic, covalent, metavalent).

Main Results:

  • Distinct PME and PMI values were identified for solids with metallic, covalent, and metavalent bonds.
  • APT can differentiate between these bond types based on their characteristic bond rupture signatures.
  • The study provides a quantitative method for assessing bonds in solids at the nanometer scale.

Conclusions:

  • Atom probe tomography offers a novel capability for characterizing and quantifying chemical bonds in solids.
  • The findings enable a deeper understanding of material properties and facilitate the design of advanced materials.
  • The proposed bonding probe tomography (BPT) approach opens new avenues in nanoscale materials characterization.