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Related Concept Videos

Metallic Solids02:37

Metallic Solids

18.4K
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....
18.4K
Properties of Organometallic Compounds01:23

Properties of Organometallic Compounds

991
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.
991
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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Coordination Compounds and Nomenclature02:54

Coordination Compounds and Nomenclature

21.3K
In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...
21.3K
Ionic Compounds: Formulas and Nomenclature03:34

Ionic Compounds: Formulas and Nomenclature

66.9K
An element composed of atoms that readily lose electrons (a metal) can react with an element composed of atoms that readily gain electrons (a nonmetal) to produce ions through complete electron transfer. The compound formed by this transfer is stabilized by the electrostatic attractions (ionic bonds) between the oppositely charged ions.
66.9K
Thermal Sigmatropic Reactions: Overview01:16

Thermal Sigmatropic Reactions: Overview

2.1K
Sigmatropic rearrangements are a class of pericyclic reactions in which a σ bond migrates from one part of a π system to another. These are intramolecular rearrangements where the total number of σ and π bonds remain unchanged.
Sigmatropic shifts are classified based on an order term [i, j ], where i and j indicate the number of atoms across which each end of the σ bond migrates. Below are examples of a [3,3] sigmatropic shift in...
2.1K

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Related Experiment Video

Updated: Jun 28, 2025

Reverse Microemulsion-mediated Synthesis of Monometallic and Bimetallic Early Transition Metal Carbide and Nitride Nanoparticles
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Reverse Microemulsion-mediated Synthesis of Monometallic and Bimetallic Early Transition Metal Carbide and Nitride Nanoparticles

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Composition templating for heterogeneous nucleation of intermetallic compounds.

Zhongping Que1, Yun Wang2, Zhongyun Fan2

  • 1Brunel Centre for Advanced Solidification Technology (BCAST), Brunel University London, Uxbridge, Middlesex, UB8 3PH, UK. Zhongping.Que@brunel.ac.uk.

Scientific Reports
|April 18, 2024
PubMed
Summary

Composition templating, not just structural, is key for refining intermetallic compounds (IMCs) in aluminum alloys. Iron atom segregation on AlB2 particles enhances heterogeneous nucleation, improving recycled alloy properties.

Keywords:
AlB2FeGrain refinementHeterogeneous nucleationInterfacial segregation

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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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Atomically Defined Templates for Epitaxial Growth of Complex Oxide Thin Films
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Atomically Defined Templates for Epitaxial Growth of Complex Oxide Thin Films
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Atomically Defined Templates for Epitaxial Growth of Complex Oxide Thin Films

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Area of Science:

  • Materials Science
  • Metallurgy
  • Casting Technology

Background:

  • Refining intermetallic compounds (IMCs) is crucial for enhancing aluminum alloy properties, especially in recycled materials.
  • Heterogeneous nucleation of IMCs is challenging due to complex atomic arrangement requirements beyond crystal structure matching.
  • Existing theories primarily focus on structural templating, overlooking compositional influences.

Purpose of the Study:

  • To investigate the role of composition templating in heterogeneous nucleation of IMCs.
  • To demonstrate how specific atomic segregation can enhance IMC nucleation.
  • To improve the refinement of IMCs in recycled aluminum alloys.

Main Methods:

  • Hypothesizing the critical role of composition templating in IMC nucleation.
  • Experimentally demonstrating iron (Fe) atom segregation on aluminum diboride (AlB2) particles.
  • Analyzing the effect of Fe-modified AlB2 on the nucleation of alpha-Al15(Fe, Mn)3Si2 in an Al-Mg-Si-Mn-Fe alloy.

Main Results:

  • Fe atom segregation on the AlB2 surface was confirmed, creating a compositionally templated nucleation site.
  • This Fe-modified AlB2 significantly enhanced the heterogeneous nucleation of alpha-Al15(Fe, Mn)3Si2.
  • A notable refinement of alpha-Al15(Fe, Mn)3Si2 particles was achieved in the studied aluminum alloy.

Conclusions:

  • Composition templating is a critical factor, alongside structural templating, for heterogeneous nucleation of IMCs.
  • Segregation of specific solute atoms (like Fe) can effectively promote IMC nucleation.
  • This approach offers a pathway to improve the microstructure and properties of recycled aluminum alloys.