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Related Concept Videos

Unit Cells01:18

Unit Cells

85
A crystal's internal structure is an orderly array of atoms, ions, or molecules, and the details of this array significantly influence the solid's properties. In a crystal, periodically repeating 'structural motifs' - which could be atoms, molecules, or groups thereof - create a 'space lattice.' This is essentially a three-dimensional, infinite array of points, each surrounded by its neighbors in an identical way, forming the basic structure of the crystal.A 'unit cell' is a theoretical...
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Ionic Crystal Structures02:42

Ionic Crystal Structures

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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...
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Recrystallization: Solid–Solution Equilibria01:10

Recrystallization: Solid–Solution Equilibria

4.7K
Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
4.7K
Crystal Growth: Principles of Crystallization01:25

Crystal Growth: Principles of Crystallization

6.0K
Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
Initiating crystallization involves manipulating the concentration of the solute and the temperature of the solution. Since crystal growth occurs when the ratio of concentration and solubility of the solute in the solvent...
6.0K
Metallic Solids02:37

Metallic Solids

21.5K
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....
21.5K
Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

87
Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...
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Mesocrystals - Properties and Applications.

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    This summary is machine-generated.

    Mesocrystals, nanostructured materials of oriented nanoparticles, offer unique properties for advanced applications. Their distinct structure enhances performance in areas like catalysis, electronics, and structural materials.

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    Area of Science:

    • Materials Science
    • Nanotechnology
    • Solid-State Chemistry

    Background:

    • Mesocrystals represent a novel class of nanostructured solid materials.
    • They are typically composed of crystallographically aligned nanoparticles.
    • Understanding their structure-property relationships is crucial for material innovation.

    Purpose of the Study:

    • To summarize the structural characteristics of mesocrystals.
    • To review the physical and physicochemical properties arising from their unique architecture.
    • To highlight the diverse potential applications of mesocrystals in various technological fields.

    Main Methods:

    • Literature review and synthesis of existing research on mesocrystals.
    • Analysis of structural features and their correlation with material properties.
    • Compilation of reported applications and performance data.

    Main Results:

    • Mesocrystals exhibit unique structural arrangements due to oriented nanoparticle assembly.
    • These structures impart distinct physical and chemical properties.
    • A wide range of applications are identified, leveraging these properties.

    Conclusions:

    • Mesocrystals are promising materials with significant potential across multiple disciplines.
    • Their unique nanostructure is key to enhanced material performance.
    • Further research and development could lead to breakthroughs in catalysis, electronics, and structural materials.