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Related Concept Videos

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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Contact Angle01:13

Contact Angle

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When a solid is dipped inside a liquid, the liquid surface becomes curved near the contact. For some solid–liquid interfaces, the liquid is pulled up along the solid, while for others, the liquid surface is convex or depressed near the solid surface. This phenomenon can be explained using the concept of cohesive and adhesive forces.
The adhesive force is the molecular force between molecules of different materials, that is, between the molecules of the solid and the liquid. The cohesive...
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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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Metallic Solids02:37

Metallic Solids

20.3K
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....
20.3K
Intermolecular Forces in Solutions02:28

Intermolecular Forces in Solutions

38.3K
The formation of a solution is an example of a spontaneous process, a process that occurs under specified conditions without energy from some external source.
When the strengths of the intermolecular forces of attraction between solute and solvent species in a solution are no different than those present in the separated components, the solution is formed with no accompanying energy change. Such a solution is called an ideal solution. A mixture of ideal gases (or gases such as helium and argon,...
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Ionic Crystal Structures02:42

Ionic Crystal Structures

16.6K
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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Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets
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Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets

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Complex Geometric Structure of a Simple Solid-Liquid Interface: GaN(0001)-Ga.

A E F de Jong1,2, V Vonk3, M Boćkowski4

  • 1Radboud University, Institute for Molecules and Materials, Heyendaalseweg 135, 6525AJ Nijmegen, Netherlands.

Physical Review Letters
|March 14, 2020
PubMed
Summary
This summary is machine-generated.

The atomic structure at the liquid gallium-gallium nitride interface reveals surface vacancies and stable layering. This interface structure, including point defects, influences physical properties and persists under high temperatures and pressures.

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Area of Science:

  • Materials Science
  • Surface Science
  • Solid-State Physics

Background:

  • Understanding solid-liquid interfaces is crucial for materials processing and device fabrication.
  • The gallium (Ga) and gallium nitride (GaN) interface is relevant for GaN-based electronics and optoelectronics.
  • Atomic-level interface structures dictate material properties and reactivity.

Purpose of the Study:

  • To determine the equilibrium atomic structure of the Ga/GaN(0001) interface.
  • To investigate the role of defects and ordering at the solid-liquid interface.
  • To assess the stability of the interface structure under varying temperature and pressure conditions.

Main Methods:

  • Utilizing advanced X-ray diffraction techniques to probe the interface structure.
  • Analyzing atomic arrangements and defect presence at the solid-liquid interface.
  • Conducting experiments under controlled high-temperature (up to 1123 K) and high-pressure (up to 32 bar N2) conditions.

Main Results:

  • Identified substrate surface vacancies as a key feature of the equilibrium interface structure.
  • Observed substrate-induced layering and preferential lateral ordering in the liquid Ga.
  • Demonstrated the stability of the observed layering up to 1123 K and 32 bar N2.
  • Found excellent agreement between Ga layer spacing and theoretical Friedel oscillation periods.

Conclusions:

  • The Ga/GaN(0001) interface is characterized by vacancies and ordered layering, significantly impacting local physical properties.
  • The discovered interface structure is robust, maintaining stability under demanding thermal and pressure conditions.
  • The findings provide fundamental insights into the atomic-scale behavior of metal-semiconductor interfaces.