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Metallic Solids02:37

Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
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Updated: Aug 4, 2025

Growth and Electrostatic/chemical Properties of Metal/LaAlO3/SrTiO3 Heterostructures
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Revealing the Epitaxial Interface between Al13Fe4 and Al5Fe2 Enabling Atomic Al Interdiffusion.

Corentin Chatelier1,2, Kanika Anand1, Peter Gille3

  • 1Université de Lorraine, CNRS, Institut Jean Lamour, Campus Artem, 2 allé André Guinier, 54000 Nancy, France.

ACS Applied Materials & Interfaces
|April 5, 2023
PubMed
Summary

This study models the atomic structure of the aluminum-steel interface, crucial for coated steel performance. Findings reveal lattice mismatch and composition drive interface stability, with aluminum diffusion forming key intermetallic layers.

Keywords:
Al13Fe4Al5Fe2Al−Fe interfaceadhesiondensity functional theorysurface X-ray diffraction

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Area of Science:

  • Materials Science
  • Surface Science
  • Computational Materials Science

Background:

  • Steel is a widely manufactured material, with properties enhanced by aluminum hot-dip coating.
  • The aluminum-iron (Al∥Fe) interface contains intermetallic compounds (Al5Fe2, Al13Fe4) critical for performance.
  • Understanding the atomic structure of this interface is key to optimizing coated steel.

Purpose of the Study:

  • To develop a consistent atomic-scale model of the Al13Fe4(010)∥Al5Fe2(001) interface.
  • To identify factors governing the stability of the Al∥Fe interface.
  • To elucidate the formation mechanism of intermetallic phases at the Al∥Fe interface.

Main Methods:

  • Surface X-ray diffraction.
  • Theoretical calculations using density functional theory (DFT).
  • Molecular dynamics (MD) simulations.

Main Results:

  • A consistent atomic-scale model for the Al13Fe4(010)∥Al5Fe2(001) interface was established.
  • Epitaxial relationships were determined: [130]Al∥[010]Al and [11̅0]Al∥[100]Al.
  • Lattice mismatch and interfacial composition were identified as primary drivers of interface stability.
  • Aluminum diffusion was proposed as the mechanism for forming Al13Fe4 and Al5Fe2 phases.

Conclusions:

  • The study provides a detailed atomic-level understanding of the Al∥Fe interface structure and stability.
  • Lattice mismatch and chemical composition are critical parameters for interface engineering.
  • Aluminum diffusion plays a significant role in the formation of protective intermetallic layers during hot-dip coating.