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Videos de Conceptos Relacionados

Ferromagnetism01:31

Ferromagnetism

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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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Molecular and Ionic Solids02:54

Molecular and Ionic Solids

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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...
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Diamagnetism01:26

Diamagnetism

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Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
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Two-Dimensional (2D) NMR: Overview01:12

Two-Dimensional (2D) NMR: Overview

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The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
The first step is the preparation period, during which nucleus A is excited with a radiofrequency pulse....
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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
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Properties of Organometallic Compounds01:23

Properties of Organometallic Compounds

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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.
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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
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Multiferoicos orgánicos e inorgánicos bidimensionales a temperatura ambiente

Yali Yang1,2, Junyi Ji1,2, Junsheng Feng3

  • 1Key Laboratory of Computational Physical Sciences (Ministry of Education), Institute of Computational Physical Sciences, and Department of Physics, Fudan University, Shanghai 200433, China.

Journal of the American Chemical Society
|August 4, 2022
PubMed
Resumen

Los investigadores diseñaron un material multiferroico a temperatura ambiente mediante la comprensión del acoplamiento magnético en sistemas orgánicos-inorgánicos 2D. Este avance permite el desarrollo de dispositivos electrónicos de próxima generación.

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Área de la Ciencia:

  • Ciencias de los materiales
  • Física de la materia condensada
  • Química del estado sólido

Sus antecedentes:

  • Los multiferroicos orgánicos e inorgánicos son la clave para la electrónica avanzada.
  • Los materiales existentes a menudo tienen bajas temperaturas de Curie magnéticas, lo que limita las aplicaciones prácticas.

Objetivo del estudio:

  • Para aclarar el mecanismo de acoplamiento magnético en materiales orgánicos-inorgánicos 2D.
  • Para diseñar un material multiferroico a temperatura ambiente.

Principales métodos:

  • Los cálculos de los primeros principios.
  • Los Hamiltonianos son el modelo efectivo.
  • Análisis del acoplamiento magnético mediado por órbitales moleculares.

Principales resultados:

  • Acoplamiento magnético mediado por órbitales moleculares identificados en 2D Cr{\displaystyle \pyz } 2.
  • Se determinó la influencia del estado de valencia molecular en el acoplamiento magnético.
  • Diseñado un multiferroico a temperatura ambiente, Cr{\displaystyle \mathrm {cr{\mathrm {h}}-fpyz} 2 , mediante la inducción de la ferroelectricidad.

Conclusiones:

  • Reveló el origen fundamental del acoplamiento magnético en sistemas orgánico-inorgánicos 2D.
  • Proporcionó una estrategia de diseño racional para materiales multiferroicos a temperatura ambiente.
  • Abrió el camino para la próxima generación de dispositivos electrónicos.