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Related Concept Videos

Metallic Solids02:37

Metallic Solids

19.0K
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....
19.0K
Theory of Metallic Conduction01:17

Theory of Metallic Conduction

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The conduction of free electrons inside a conductor is best described by quantum mechanics. However, a classical model makes predictions close to the results of quantum mechanics. It is called the theory of metallic conduction.
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
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Bonding in Metals02:32

Bonding in Metals

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Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”. 
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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

28.0K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
28.0K
Trends in Lattice Energy: Ion Size and Charge02:54

Trends in Lattice Energy: Ion Size and Charge

24.4K
An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
24.4K
Colors and Magnetism03:02

Colors and Magnetism

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Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
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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

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Medium-range order and compositional correlation in metallic glasses.

Chae Woo Ryu1,2, Takeshi Egami2,3,4

  • 1Department of Materials Science and Engineering, Hongik University, Seoul 04066, South Korea.

The Journal of Chemical Physics
|June 16, 2025
PubMed
Summary
This summary is machine-generated.

Metallic glasses exhibit medium-range order (MRO) independent of local chemical composition. MRO in pair-distribution functions reflects atomic density fluctuations, not detailed local structure.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Computational Materials Science

Background:

  • Metallic glasses often display medium-range order (MRO), characterized by oscillations in the atomic pair-distribution function (PDF) beyond the first peak.
  • MRO is a key structural feature influencing the properties of metallic alloys.

Purpose of the Study:

  • To investigate the influence of local chemical order on the medium-range order (MRO) in binary metallic alloy glasses.
  • To understand the relationship between compositional ordering and MRO in metallic glasses.

Main Methods:

  • Utilized computational simulations to model various binary metallic alloy glasses.
  • Analyzed compositionally resolved pair-distribution functions (PDFs) and their MRO components.

Main Results:

  • Compositional ordering in metallic glasses is primarily confined to nearest-neighbor atoms.
  • Medium-range order (MRO) in metallic glasses is largely unaffected by compositional ordering.
  • A secondary MRO periodicity can emerge due to strong repulsions between specific elements.

Conclusions:

  • The MRO oscillations in the PDF are indicative of atomic density fluctuations rather than detailed local atomic structure.
  • The findings suggest that MRO in metallic glasses is a more general phenomenon related to density correlations.