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Videos de Conceptos Relacionados

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....
21.1K
Structures of Solids02:22

Structures of Solids

19.8K
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...
19.8K
Ionic Crystal Structures02:42

Ionic Crystal Structures

19.0K
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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Structural Isomerism02:34

Structural Isomerism

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Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
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Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

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Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
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Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

13.4K
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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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

Published on: June 7, 2018

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Orden Estructural de Medio Alcance en Arsénico Amorfo

Yuanbin Liu1, Yuxing Zhou1, Richard Ademuwagun1

  • 1Inorganic Chemistry Laboratory, Department of Chemistry, University of Oxford, Oxford OX1 3QR, U.K.

Journal of the American Chemical Society
|February 26, 2026
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores revelaron el orden de medio alcance (MRO) en arsénico amorfo (a-As) utilizando simulaciones atomísticas aprendidas por máquinas. El estudio aclara el MRO

Palabras clave:
arsénico amorfoorden de medio alcancesimulaciones de aprendizaje automáticoestructura atómicafósforo amorfo

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Área de la Ciencia:

  • Ciencia de Materiales
  • Física de la Materia Condensada
  • Química Computacional

Sus antecedentes:

  • El orden de medio alcance (MRO) es crucial en materiales amorfos pero poco comprendido.
  • Es esencial comprender el MRO en sistemas elementales amorfos como el arsénico (a-As).

Objetivo del estudio:

  • Elucidar el origen y la naturaleza del MRO en arsénico amorfo (a-As).
  • Comparar las características estructurales de a-As con el fósforo amorfo (a-P).
  • Investigar el comportamiento estructural dependiente de la presión de a-As y a-P.

Principales métodos:

  • Simulaciones atomísticas avanzadas que utilizan potenciales aprendidos por máquinas.
  • Flujos de trabajo automatizados para derivar potenciales aprendidos por máquinas.
  • Comparación del factor de estructura simulado con datos experimentales para a-As.

Principales resultados:

  • Las simulaciones reproducen con precisión el factor de estructura experimental de a-As, incluido el pico de difracción agudo inicial (FSDP).
  • El arsénico amorfo exhibe una distribución de ángulos diedros más uniforme que el fósforo amorfo, consistente con una red aleatoria continua.
  • El FSDP en a-As está relacionado con el tamaño y la distribución de los vacíos dentro de la red amorfa.

Conclusiones:

  • El estudio proporciona información fundamental sobre el MRO en arsénico amorfo.
  • Los hallazgos resaltan la utilidad del aprendizaje automático automatizado para simulaciones atomísticas.
  • La estructura del arsénico amorfo se describe mejor como una red aleatoria continua de coordinación triple.