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Related Concept Videos

Metallic Solids02:37

Metallic Solids

16.3K
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...
16.3K
Ionic Crystal Structures02:42

Ionic Crystal Structures

17.8K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
17.8K
Phase Transitions: Melting and Freezing02:39

Phase Transitions: Melting and Freezing

11.6K
Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
11.6K
Structures of Solids02:22

Structures of Solids

17.6K
Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
17.6K
Imperfections in Crystal Structure: Non-Stoichiometric Defects01:29

Imperfections in Crystal Structure: Non-Stoichiometric Defects

109
Non-stoichiometric defects refer to a type of defect in the crystal structure of a compound where the ratio of its constituent elements deviates from the ideal stoichiometric ratio. There are two main types of non-stoichiometric defects: metal excess defects and metal deficiency defects.Metal excess defects occur when there is a slight surplus of metal ions than what is required by the stoichiometric ratio of the compound. For example, heating a sodium chloride crystal in sodium vapor results...
109
Molecular and Ionic Solids02:54

Molecular and Ionic Solids

16.4K
Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
16.4K

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Related Experiment Video

Updated: Apr 23, 2026

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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Intermetallic crystal structures as foams. Beyond Frank-Kasper.

Charlotte Bonneau1, Michael O'Keeffe

  • 1Glencroft , Guildford, Surrey, U.K.

Inorganic Chemistry
|September 24, 2014
PubMed
Summary

Intermetallic structures can be visualized using dual tilings, revealing atom coordination and bonding through polyhedral foams. This method offers a simultaneous view of atomic coordination in complex crystal structures.

Area of Science:

  • Materials Science
  • Crystallography
  • Chemistry

Background:

  • Many intermetallic structures exhibit atomic and bond arrangements that partition space into tetrahedral tilings.
  • Frank-Kasper phases are a notable example of such tetrahedral tilings in intermetallic compounds.

Purpose of the Study:

  • To explore the utility of dual tilings for representing intermetallic crystal structures.
  • To demonstrate how dual polyhedral foams can visualize atomic coordination and bonding.

Main Methods:

  • Describing intermetallic structures using their dual tilings, which form polyhedral foams.
  • Correlating the number of faces on dual polyhedra with atom coordination numbers.
  • Mapping face sharing in dual polyhedra to atomic bonds in the direct structure.

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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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Main Results:

  • Dual tilings provide a topological foam representation of intermetallic structures.
  • The number of faces on dual polyhedra directly corresponds to atom coordination numbers.
  • Face sharing between adjacent dual polyhedra represents atomic bonds.

Conclusions:

  • Dual tilings offer an alternative and insightful depiction of intermetallic crystal structures.
  • This visualization method allows for simultaneous observation of coordination for all atoms within the structure.