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Bonding in Metals

Bonding in Metals

Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”.

Metallic Solids

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....

Alkali Metals

Alkali Metals

Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals

Metal-Ligand Bonds

Metal-Ligand Bonds

The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...

Properties of Transition Metals

Properties of Transition Metals

Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.

Dimensional Analysis

Dimensional Analysis

Dimensional analysis, also known as the factor label method, is a versatile approach for mathematical operations. The main principle behind this approach is: the units of quantities must be subjected to the same mathematical operations as their associated numbers. This method can be applied to computations ranging from simple unit conversions to more complex and multi-step calculations involving several different quantities and their units.
Conversion Factors and Dimensional Analysis
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A Fabrication and Measurement Method for a Flexible Ferroelectric Element Based on Van Der Waals Heteroepitaxy

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Ferroeléctricos tridimensionales de perovskita sin metales

Heng-Yun Ye¹, Yuan-Yuan Tang¹, Peng-Fei Li¹

¹Jiangsu Key Laboratory for Science and Applications of Molecular Ferroelectrics, Southeast University, Nanjing 211189, P.R. China.

Science (New York, N.Y.)

|July 14, 2018

Resumen

Los investigadores descubrieron ferroeléctricos orgánicos de perovskita sin metales. Un material destacado, el triioduro de amonio MDABCO, exhibe propiedades adecuadas para la electrónica flexible y la robótica suave.

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Área de la Ciencia:

Ciencias de los materiales
Física del estado sólido
Química orgánica

Sus antecedentes:

Los ferroeléctricos de perovskita inorgánica son vitales para los dispositivos electrónicos, pero carecen de flexibilidad.
Los ferroeléctricos orgánicos ofrecen flexibilidad y un procesamiento respetuoso con el medio ambiente, pero son escasos.
El descubrimiento de nuevos ferroeléctricos orgánicos es crucial para las aplicaciones de próxima generación.

Objetivo del estudio:

Identificar y caracterizar los nuevos ferroeléctricos orgánicos de perovskita sin metales.
Explorar materiales con propiedades adecuadas para aplicaciones electrónicas flexibles y avanzadas.
Para hacer frente a la falta de ferroeléctricos orgánicos de perovskita altamente deseables.

Principales métodos:

Síntesis de compuestos orgánicos de perovskita sin metales.
Caracterización estructural mediante difracción de rayos X y otras técnicas.
Medición de las propiedades ferroeléctricas, incluida la polarización espontánea y la temperatura de transición de fase.

Principales resultados:

Se identificó una nueva familia de perovskitas orgánicas libres de metales con una estructura 3D.
El triyoduro de amonio MDABCO demostró una alta polarización espontánea (22 μC/cm2) y una temperatura de Curie (448 K).
Este material exhibe ocho direcciones de polarización distintas, ofreciendo aplicaciones versátiles.

Conclusiones:

Las perovskitas orgánicas libres de metales representan una clase prometedora de materiales para aplicaciones ferroeléctricas.
Las propiedades del triyoduro de amonio MDABCO lo hacen ideal para la electrónica flexible, la robótica blanda y los dispositivos biomédicos.
Este descubrimiento abre nuevas vías para diseñar materiales ferroeléctricos avanzados y flexibles.