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Related Concept Videos

Metallic Solids02:37

Metallic Solids

18.2K
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....
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Trends in Lattice Energy: Ion Size and Charge02:54

Trends in Lattice Energy: Ion Size and Charge

23.7K
An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
23.7K
Ionic Crystal Structures02:42

Ionic Crystal Structures

14.1K
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...
14.1K
Qualitative Analysis03:46

Qualitative Analysis

21.5K
For solutions containing mixtures of different cations, the identity of each cation can be determined by qualitative analysis. This technique involves a series of selective precipitations with different chemical reagents, each reaction producing a characteristic precipitate for a specific group of cations. Metal ions within a group are further separated by varying the pH, heating the mixture to redissolve a precipitate, or adding other reagents to form complex ions.
For instance, group IV...
21.5K
Molecular and Ionic Solids02:54

Molecular and Ionic Solids

16.9K
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...
16.9K
Structures of Solids02:22

Structures of Solids

14.0K
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...
14.0K

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Updated: Jun 3, 2025

Facile Preparation of Ultrafine Aluminum Hydroxide Particles with or without Mesoporous MCM-41 in Ambient Environments
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Liquid Structure of Magnesium Aluminates.

Viviana Cristiglio1, Irina Pozdnyakova2, Aleksei Bytchkov3

  • 1Institut Laue-Langevin, 38042 Grenoble Cedex 9, France.

Materials (Basel, Switzerland)
|January 8, 2025
PubMed
Summary
This summary is machine-generated.

This study investigated the liquid structure of magnesium aluminates using aerodynamic levitation and diffraction techniques. Results reveal consistent local structures and coordination numbers across various compositions, differing from solid-state models.

Keywords:
PDF analysisaerodynamic levitationmagnesium aluminatesmeltspair distribution functionstructurestructure factor

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • High-Temperature Chemistry

Background:

  • Magnesium aluminates are crucial refractory materials in glass and glass-ceramic technologies.
  • Fabrication typically involves high-temperature molten phases, but liquid-state data is scarce due to measurement challenges.
  • Understanding liquid structure is vital for optimizing material properties and processing.

Purpose of the Study:

  • To investigate the short-range structural order of liquid magnesium aluminates.
  • To determine local structures, coordination numbers, and interatomic distances in the liquid state.
  • To assess the applicability of solid-state structural models to liquid magnesium aluminates.

Main Methods:

  • Aerodynamic levitation with CO2 laser heating for sample containment and melting.
  • X-ray and neutron diffraction for structural analysis.
  • Calculation of structure factors and pair distribution functions.

Main Results:

  • Detailed information on short-range structural order was obtained for liquid magnesium aluminates (x = 0.33, 0.5, 0.75).
  • Local structures showed similarity across compositions, with average coordination numbers n¯AlO∼4.5 and n¯MgO∼5.1.
  • Interatomic distances were determined as rAlO=1.76-1.78 Å and rMgO=1.93-1.95 Å, consistent with simulations.

Conclusions:

  • The local structure of liquid magnesium aluminates is relatively uniform across the studied compositions.
  • For the spinel endmember (x = 0.5), coordination numbers suggest the solid-state inversion coefficient is not directly applicable to the liquid state.
  • The findings provide crucial insights into the structure-property relationships of molten refractory oxides.