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Related Concept Videos

Metallic Solids02:37

Metallic Solids

18.4K
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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Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

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The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
Types of Unit Cells
Imagine taking a large number of identical...
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Types of Semiconductors01:20

Types of Semiconductors

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Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
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Ionic Crystal Structures02:42

Ionic Crystal Structures

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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
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Theoretical Calculation and Experimental Verification for Dislocation Reduction in Germanium Epitaxial Layers with Semicylindrical Voids on Silicon
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Topological line defects in hexagonal SiC monolayer.

Wallace P Morais1, Guilherme J Inacio1, Rodrigo G Amorim2

  • 1Departamento de Física, Universidade Federal do Espírito Santo, Vitória-ES, 29075-910, Brazil.

Physical Chemistry Chemical Physics : PCCP
|December 1, 2023
PubMed
Summary
This summary is machine-generated.

Defect engineering in 2D silicon carbide (SiC) reveals stable line defects that alter electronic properties and enhance hydrogen adsorption, opening doors for new applications.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Computational Chemistry

Background:

  • Two-dimensional (2D) materials offer tunable properties through defect engineering.
  • Recent synthesis of 2D silicon carbide (SiC) necessitates understanding defect impacts.
  • Extended Line Defects (ELDs) are crucial structural features in 2D materials.

Purpose of the Study:

  • Investigate the structural, electronic, and reactivity properties of ELDs in hexagonal SiC.
  • Characterize different types of interstitial atom pair ELDs (SiSi-, SiC-, CC-ELD).
  • Explore the influence of ELDs on SiC's electronic band structure and chemical reactivity.

Main Methods:

  • Density Functional Theory (DFT) for structural and electronic analysis.
  • Born-Oppenheimer Molecular Dynamics (MD) for stability assessment.
  • Kinetic Monte-Carlo (KMC) simulations for reactivity studies.
  • Simulated Scanning Tunneling Microscopy (STM) for defect identification.

Main Results:

  • Formation of all studied ELD systems is endothermic; CC-ELD exhibits highest stability at 300 K.
  • Simulated STM successfully identified and distinguished between SiSi-, SiC-, and CC-ELDs.
  • ELDs introduce mid-gap states, altering the electronic band structure from pristine SiC's direct band gap (2.48 eV).
  • ELD regions show significantly enhanced reactivity towards hydrogen adsorption.

Conclusions:

  • Defect engineering via ELDs in hexagonal SiC offers a route to tune material properties.
  • The identified ELDs impact electronic structure and surface reactivity.
  • Findings support potential applications of defect-engineered 2D SiC in catalysis, optoelectronics, and surface science.