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Related Concept Videos

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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Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction01:22

Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction

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The radical dimerization of ketones or aldehydes gives vicinal diols through a pinacol coupling reaction. However, the behavior of titanium metals used for the reaction as a source of electrons is unusual. When the reaction is carried out in the presence of titanium, diols can be isolated at low temperatures. Else titanium further reacts with diols, forming alkenes through the McMurry reaction.
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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.
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Valence Bond Theory02:42

Valence Bond Theory

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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...
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Properties of Organometallic Compounds01:23

Properties of Organometallic Compounds

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Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.
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Structural Isomerism02:34

Structural Isomerism

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Isomerism in Complexes
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Related Experiment Video

Updated: Nov 19, 2025

Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model
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Metallic Diluted Dimerization in VO2 Tweeds.

Felip Sandiumenge1, Laura Rodríguez2, Miguel Pruneda2

  • 1Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus de la UAB, Bellaterra, Catalonia, 08193, Spain.

Advanced Materials (Deerfield Beach, Fla.)
|January 27, 2021
PubMed
Summary
This summary is machine-generated.

Vanadium dioxide exhibits nanoscale tweed structures below its metal-insulator transition. This atomic-scale structural complexity, previously hidden, reveals new insights into vanadium dioxide

Keywords:
VO2intermediate phasesmetal-insulator transitionsthin filmstweed textures

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Solid-State Chemistry

Background:

  • Vanadium dioxide (VO2) is a key material for its metal-insulator transition (MIT).
  • Phase separation textures in VO2 have complicated the understanding of its MIT.
  • Atomic-scale details of coexisting phases in VO2 remain largely unknown.

Purpose of the Study:

  • To investigate the atomic-scale structure and phases within VO2 during its MIT.
  • To resolve the nature of nanoscale phase separation in VO2.
  • To elucidate the structural mechanisms underlying the VO2 metal-insulator transition.

Main Methods:

  • Atomic resolution imaging and spectroscopy.
  • Density functional theory (DFT) calculations.
  • High-resolution electron microscopy and spectroscopy.

Main Results:

  • Discovery of ferroelastic tweed structures at approximately 5 nm length scales in VO2.
  • Identification of a novel monoclinic phase, woven by semi-dimerized vanadium chains, within the pretransitional tweed.
  • DFT calculations confirm this monoclinic phase acts as a structural bridge between metallic and insulating states.

Conclusions:

  • Atomic-scale structural intermixing and phase coexistence are fundamental to VO2's MIT.
  • The identified nanoscale tweed structures provide a new multiscale perspective for interpreting VO2 behavior.
  • Understanding these atomic-scale features is crucial for advancing VO2-based device applications.