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Videos de Conceptos Relacionados

Types of Chemical Bonds02:37

Types of Chemical Bonds

Chemical bonding theories were pioneered by American chemist Gilbert N. Lewis. He developed a model called the Lewis model to explain the type and formation of different bonds. Chemical bonding is central to chemistry; it explains how atoms or ions bond together to form molecules. It explains why some bonds are strong and others are weak, or why one carbon bonds with two oxygens and not three; why water is H2O and not H4O.
Trends in Lattice Energy: Ion Size and Charge02:54

Trends in Lattice Energy: Ion Size and Charge

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:
Molecular and Ionic Solids02:54

Molecular and Ionic Solids

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...
Metallic Solids02:37

Metallic Solids

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. Many...
Gauss's Law in Dielectrics01:17

Gauss's Law in Dielectrics

Consider a polar dielectric placed in an external field. In such a dielectric, opposite charges on adjacent dipoles neutralize each other, such that the net charge within the dielectric is zero. When a polar dielectric is inserted in between the capacitor plates, an electric field is generated due to the presence of net charges near the edge of the dielectric and the metal plates interface. Since the external electrical field merely aligns the dipoles, the dielectric as a whole is neutral. An...
Ferromagnetism01:31

Ferromagnetism

Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...

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Video Experimental Relacionado

Updated: Jul 9, 2026

Determination of Thermodynamic Properties of Alkaline Earth-liquid Metal Alloys Using the Electromotive Force Technique
12:02

Determination of Thermodynamic Properties of Alkaline Earth-liquid Metal Alloys Using the Electromotive Force Technique

Published on: November 3, 2017

Comportamiento del electrolito sólido de NaMgF3: Implicaciones geofísicas.

M O'keeffe, J O Bovin

    Science (New York, N.Y.)
    |November 2, 1979
    PubMed
    Resumen
    Este resumen es generado por máquina.

    El fluoruro de sodio y magnesio (NaMgF3) se convierte en un electrolito sólido conductor a altas temperaturas. Esto sugiere que la Tierra es la Tierra.

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    Área de la Ciencia:

    • Química del estado sólido.
    • La geofísica es la geofísica.
    • Ciencia de los materiales ciencia de los materiales.

    Sus antecedentes:

    • Comprender las propiedades eléctricas de los minerales del manto es crucial para interpretar los datos geofísicos.
    • Estudios anteriores se han centrado en la conductividad electrónica, pero la conductividad iónica puede ser significativa.

    Objetivo del estudio:

    • Investigar la conductividad iónica en estado sólido de NaMgF3 como modelo para MgSiO3 en condiciones del manto inferior.
    • Para predecir el mecanismo de transporte de carga dominante en el manto inferior de la Tierra.

    Principales métodos:

    • Mediciones de conductividad dependientes de la temperatura de NaMgF3.3.
    • Extrapolación del comportamiento de NaMgF3 al isostructual MgSiO3 bajo condiciones de alta presión y alta temperatura.

    Principales resultados:

    • NaMgF3 exhibe una transición suave a una fase de electrolito sólido altamente conductor con el aumento de la temperatura.
    • La conductividad alcanza 130 S/m justo por debajo del punto de fusión.

    Conclusiones:

    • Se espera que el compuesto isostructural MgSiO3 exhiba un comportamiento similar de conductividad iónica en condiciones del manto inferior.
    • Se predice que la conductividad iónica es el mecanismo dominante en el manto inferior de la Tierra, no la conductividad electrónica.