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Related Concept Videos

Metallic Solids02:37

Metallic Solids

21.0K
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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Atomic Absorption Spectroscopy: Atomization Methods01:25

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Atomic Absorption Spectroscopy (AAS) atomizes samples through flame atomization or electrothermal atomization. Flame atomization typically involves a nebulizer and spray chamber assembly to combine the sample with a fuel–oxidant mixture, creating a fine aerosol mist that enters a burner. Typically, the fuel and oxidant are combined in an approximately stoichiometric ratio. However, for atoms that are easily oxidized, a fuel-rich mixture may be more advantageous. Only about 5% of the...
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Atomically Visualizing Elemental Segregation-Induced Surface Alloying and Restructuring.

Lianfeng Zou1, Jonathan Li2, Dmitri Zakharov3

  • 1Department of Mechanical Engineering & Materials Science and Engineering Program, State University of New York at Binghamton , Binghamton, New York 13902, United States.

The Journal of Physical Chemistry Letters
|December 2, 2017
PubMed
Summary
This summary is machine-generated.

Surface segregation of gold atoms in copper alloys leads to a stable, reconstructed L1₂ Cu₃Au(110) surface alloy. This unique structure is maintained by favorable copper-gold atom arrangements.

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Area of Science:

  • Materials Science
  • Surface Science
  • Solid-State Chemistry

Background:

  • Understanding surface alloy formation is crucial for catalysis and electronics.
  • Copper-gold (Cu-Au) systems exhibit complex surface phenomena.
  • Previous studies lacked in-situ atomic-level resolution of surface alloy evolution.

Purpose of the Study:

  • To investigate the atomic structure evolution during surface alloy formation in Cu(Au) solid solutions.
  • To elucidate the mechanism behind the formation of reconstructed surface alloys.
  • To determine the stability factors of the observed surface structures.

Main Methods:

  • In situ transmission electron microscopy (TEM) for real-time atomic structure observation.
  • Spatially and temporally resolved imaging of surface and subsurface regions.
  • Atomistic simulations to complement experimental findings.

Main Results:

  • Observed surface segregation of gold (Au) atoms in a Cu(Au) solid solution.
  • Identified nucleation and growth of a (2 × 1) missing-row reconstructed L1₂ Cu₃Au(110) surface alloy.
  • Demonstrated the stability of the (2 × 1) reconstruction due to favored Cu-Au diatomic configurations.

Conclusions:

  • Surface segregation drives the formation of a stable, reconstructed Cu₃Au(110) surface alloy.
  • The (2 × 1) missing-row reconstruction is a stable surface structure.
  • Favored copper-gold diatomic configurations are key to maintaining surface alloy stability.