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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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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.
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Distinct interfacial structures between grains.

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  • 1Aiiso Yufeng Li Family Department of Chemical and Nano Engineering, University of California San Diego, La Jolla, CA, USA.

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|October 24, 2024
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Summary
This summary is machine-generated.

Adsorption transitions at grain boundaries create unique structures not found in bulk crystals. This phenomenon reveals novel material science possibilities at the nanoscale.

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Area of Science:

  • Materials Science
  • Crystallography
  • Surface Science

Background:

  • Grain boundaries are interfaces between crystals in a polycrystal.
  • Bulk crystals have well-defined atomic structures.
  • Understanding phenomena at grain boundaries is crucial for material properties.

Purpose of the Study:

  • To investigate adsorption transitions at grain boundaries.
  • To identify and characterize resulting structures.
  • To compare these structures with those in bulk crystals.

Main Methods:

  • Simulations of adsorption processes.
  • Analysis of atomic structures at interfaces.
  • Comparison with theoretical models of bulk crystal structures.

Main Results:

  • Adsorption transitions induce unique structural configurations at grain boundaries.
  • These configurations are not permitted by the symmetry rules of bulk crystals.
  • The study identifies specific examples of these forbidden structures.

Conclusions:

  • Grain boundary adsorption can lead to emergent structures.
  • These structures offer new avenues for materials design.
  • The findings challenge traditional crystallographic constraints.