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Related Concept Videos

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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Structures of Solids02:22

Structures of Solids

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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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Molecular and Ionic Solids02:54

Molecular and Ionic Solids

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Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
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Network Covalent Solids02:18

Network Covalent Solids

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Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
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Molecular Comparison of Gases, Liquids, and Solids02:26

Molecular Comparison of Gases, Liquids, and Solids

54.0K
Particles in a solid are tightly packed together (fixed shape) and often arranged in a regular pattern; in a liquid, they are close together with no regular arrangement (no fixed shape); in a gas, they are far apart with no regular arrangement (no fixed shape). Particles in a solid vibrate about fixed positions (cannot flow) and do not generally move in relation to one another; in a liquid, they move past each other (can flow) but remain in essentially constant contact; in a gas, they move...
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Energy Bands in Solids01:01

Energy Bands in Solids

1.9K
Isolated atoms have discrete energy levels that are well described by the Bohr model. And, it quantifies the energy of an electron in a hydrogen atom as En. Higher quantum numbers 'n' yield less negative, closer electron energy levels.
 Band Formation:
When atoms are brought close together, as in a solid, these discrete energy levels begin to split due to the overlap of electron orbitals from adjacent atoms. This split occurs because of the Pauli exclusion principle, which states...
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Characterization of Thermal Transport in One-dimensional Solid Materials
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Effect of light atoms on thermal transport across solid-solid interfaces.

Ruiyang Li1, Kiarash Gordiz2, Asegun Henry2

  • 1Department of Aerospace and Mechanical Engineering, University of Notre Dame, Notre Dame, Indiana 46556, USA. elee18@nd.edu tluo@nd.edu.

Physical Chemistry Chemical Physics : PCCP
|July 30, 2019
PubMed
Summary
This summary is machine-generated.

Introducing light atoms into SiC/GaN interfaces can significantly boost thermal transport. This study shows doping can increase thermal boundary conductance (TBC) by up to 50%, enhancing heat dissipation in electronic devices.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Efficient thermal transport across solid interfaces is critical for advanced power electronics.
  • Understanding interfacial thermal resistance is key to managing heat in microelectronic devices.

Purpose of the Study:

  • To investigate the impact of light atom doping on thermal transport across SiC/GaN interfaces.
  • To explore how varying doping concentrations, masses, and depths of light atoms influence thermal boundary conductance (TBC).

Main Methods:

  • Non-equilibrium molecular dynamics (NEMD) simulations were employed.
  • The study analyzed various light atom doping configurations (substitutional and interstitial).
  • Spectral analysis was used to understand phonon behavior at the interface.

Main Results:

  • Doping SiC/GaN interfaces with light atoms, such as boron, increased TBC by up to 50%.
  • Both substitutional and interstitial light atom doping led to enhanced TBC.
  • Stronger coupling of mid- and high-frequency phonons was identified as the mechanism for improved TBC.

Conclusions:

  • Light atom doping offers a promising strategy to enhance thermal boundary conductance in solid interfaces.
  • The findings suggest a practical method for improving heat dissipation in materials relevant to power electronics.
  • Light atoms can be incorporated during material growth to optimize thermal performance.