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Emission Spectroscopic Boundary Layer Investigation during Ablative Material Testing in Plasmatron
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Anomalous twin boundaries in two dimensional materials.

A P Rooney1,2, Z Li1,2, W Zhao3,4

  • 1School of Materials, University of Manchester, Manchester, M13 9PL, UK.

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|September 7, 2018
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Summary
This summary is machine-generated.

Twin boundary defects in graphite are not atomically sharp as previously thought. New imaging and calculations reveal complex, long-range bending due to van der Waals bonding, impacting other layered materials.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Twin boundary defects are common in crystalline materials under stress.
  • Graphite has been a model system for studying twinning, with assumed atomically sharp interfaces.

Purpose of the Study:

  • To investigate the atomic structure of twin boundaries in graphite.
  • To determine the role of bonding in the nature of these interfaces.
  • To explore the implications for other van der Waals materials.

Main Methods:

  • High-resolution annular dark-field scanning transmission electron microscopy (HAADF-STEM) for atomic imaging.
  • Density functional theory (DFT) calculations to model interface energetics and structure.

Main Results:

  • Graphitic twin boundaries exhibit complex, long-range bending, not atomically sharp interfaces.
  • Van der Waals bonding is key to this non-ideal interface structure.
  • Similar complex boundaries are observed in other van der Waals materials.

Conclusions:

  • The traditional model of sharp twin boundaries in graphite is inaccurate.
  • Van der Waals interactions fundamentally alter interface structures in layered materials.
  • These findings have implications for understanding microstructure, defects, and properties in a range of 2D and layered materials.