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Related Concept Videos

Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The semiconductor's...
Properties of Transition Metals02:58

Properties of Transition Metals

Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
Colors and Magnetism03:02

Colors and Magnetism

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 eye.
Metallic Solids02:37

Metallic Solids

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. Many...
Bonding in Metals02:32

Bonding in Metals

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”.
Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions.

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Related Experiment Video

Updated: Jul 11, 2026

Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
06:53

Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks

Published on: June 9, 2023

Localization, interactions, and the metal-insulator transition.

R C Dynes, P A Lee

    Science (New York, N.Y.)
    |January 27, 1984
    PubMed
    Summary

    Traditional theories of electronic conduction fail at low temperatures. New research highlights electron localization and interactions in disordered metals, impacting the metal-insulator transition.

    Area of Science:

    • Condensed matter physics
    • Materials science

    Background:

    • Traditional Boltzmann theory inadequately describes electronic conduction in metals at low temperatures.
    • Experimental and theoretical evidence shows a breakdown of conventional models under specific conditions.

    Purpose of the Study:

    • To investigate the limitations of current electronic conduction theories.
    • To explore the role of electron localization and electron-electron interactions in disordered systems.
    • To understand their influence on the metal-insulator transition.

    Main Methods:

    • Theoretical analysis of electron localization phenomena.
    • Investigation of electron-electron interactions in disordered media.
    • Experimental verification of predictions related to conduction properties.

    More Related Videos

    Writing and Low-Temperature Characterization of Oxide Nanostructures
    06:43

    Writing and Low-Temperature Characterization of Oxide Nanostructures

    Published on: July 18, 2014

    Fabrication of Spatially Confined Complex Oxides
    08:45

    Fabrication of Spatially Confined Complex Oxides

    Published on: July 1, 2013

    Related Experiment Videos

    Last Updated: Jul 11, 2026

    Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
    06:53

    Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks

    Published on: June 9, 2023

    Writing and Low-Temperature Characterization of Oxide Nanostructures
    06:43

    Writing and Low-Temperature Characterization of Oxide Nanostructures

    Published on: July 18, 2014

    Fabrication of Spatially Confined Complex Oxides
    08:45

    Fabrication of Spatially Confined Complex Oxides

    Published on: July 1, 2013

    Main Results:

    • Deficiencies in traditional electronic conduction theories identified.
    • Electron localization and electron-electron interactions confirmed as critical factors.
    • Experimentally verifiable predictions derived from the improved understanding.

    Conclusions:

    • A revised understanding of electronic conduction is necessary, particularly at low temperatures.
    • Electron localization and interactions significantly alter the behavior of disordered metals.
    • These effects are crucial for explaining the metal-insulator transition.