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Related Concept Videos

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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.
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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.
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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.
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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 Comparison of Gases, Liquids, and Solids02:26

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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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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.
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Spontaneous solid-solid interface melting driven by concentration gradient.

Yiying Zhu1, Hao Wang1, Mo Li2

  • 1Guangdong Provincial Key Laboratory of Micro/Nano Optomechatronics Engineering, College of Mechatronics and Control Engineering, Shenzhen University, Shenzhen 518060, People's Republic of China.

The Journal of Chemical Physics
|August 24, 2019
PubMed
Summary
This summary is machine-generated.

We discovered spontaneous interface melting in heterogeneous materials below their melting points. This phenomenon, driven by atomic disorder and concentration gradients, alters material behavior and melting transitions.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Physical Chemistry

Background:

  • Heterogeneous material interfaces are common in modern applications.
  • Interfacial gradients in atomic structure and concentration significantly impact material properties.
  • Understanding interface behavior is crucial for designing advanced materials.

Purpose of the Study:

  • To investigate the melting behavior at the interface of crystalline metals and amorphous solids.
  • To determine the factors influencing interfacial melting below equilibrium temperatures.
  • To analyze the nature of the melting transition at material interfaces.

Main Methods:

  • Formation of interfaces between crystalline metals and amorphous solids.
  • In-situ observation of interfacial transformations.
  • Analysis of atomic structures and concentration profiles across the interface.
  • Thermodynamic and kinetic analysis of the melting process.

Main Results:

  • Spontaneous melting observed at the interface below the equilibrium melting temperatures of constituent materials.
  • Melting transition can be continuous, lacking first-order transition features.
  • Interfacial melting is attributed to random atomic disordering and concentration gradients.
  • Disordering results from interdiffusion of elements/impurities into the crystalline phase.

Conclusions:

  • Interfacial melting in heterogeneous systems can occur under unique conditions.
  • Atomic disordering and concentration gradients fundamentally alter melting behavior.
  • This finding offers new insights into phase transitions at material interfaces.
  • Potential implications for designing materials with tailored interfacial properties.