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Related Concept Videos

Metallic Solids02:37

Metallic Solids

18.3K
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....
18.3K
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

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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...
26.2K
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,...
1.3K
Valence Bond Theory02:42

Valence Bond Theory

8.5K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
8.5K
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

479
In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
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Related Experiment Video

Updated: Jun 13, 2025

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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Interplay between disorder and electronic correlations in compositionally complex alloys.

David Redka1,2, Saleem Ayaz Khan1, Edoardo Martino3

  • 1New Technologies Research Center, University of West Bohemia, Plzen, Czech Republic.

Nature Communications
|September 12, 2024
PubMed
Summary
This summary is machine-generated.

This study explores electronic correlations in high-entropy alloys like CrMnFeCoNi. Many-body effects significantly impact electronic properties, influencing material development.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Solid State Chemistry

Background:

  • Compositionally complex alloys, including high-entropy alloys, possess unique transport properties.
  • The influence of chemical disorder and electronic correlations on their electronic structure is not well understood.

Purpose of the Study:

  • Investigate the interplay between chemical disorder and electronic correlations in the CrMnFeCoNi alloy.
  • Elucidate the impact of these interactions on the material's electronic structure and properties.

Main Methods:

  • Employed resonant and valence band photoemission spectroscopy.
  • Conducted electrical resistivity and optical conductivity measurements.
  • Utilized density functional theory and dynamical mean-field theory calculations.

Main Results:

  • Identified signatures of electronic correlations and many-body effects, especially away from the Fermi level.
  • Found that electronic transport is primarily governed by disorder and short-range order at low temperatures.
  • Observed that optical conductivity and high-temperature transport are affected by quasiparticle lifetimes.

Conclusions:

  • Electronic correlations play a significant role in the properties of complex alloys.
  • Disorder and many-body effects are crucial for understanding these materials.
  • Findings aid in designing advanced materials with tunable electronic characteristics.