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Electrical Conductivity01:13

Electrical Conductivity

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In perfect conductors, the electric field inside is always zero due to the abundance of free electrons, which nullify any field by flowing. As a result, any residual charge resides on the surface.
In a practical conductor, an applied electric field may be sustained, causing a flow of electrons, which produce a current. The differential form of the current, the current density, is related to the electric field.
More generally, it is related to the force per unit charge, which involves the...
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Valence Bond Theory02:42

Valence Bond Theory

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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
8.6K
Molecular and Ionic Solids02:54

Molecular and Ionic Solids

17.2K
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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Colors and Magnetism

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Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
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Theory of Metallic Conduction01:17

Theory of Metallic Conduction

1.3K
The conduction of free electrons inside a conductor is best described by quantum mechanics. However, a classical model makes predictions close to the results of quantum mechanics. It is called the theory of metallic conduction.
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
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¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

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A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied...
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Tuning Oxide Properties by Oxygen Vacancy Control During Growth and Annealing
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在多组分 ABO4型氧化物中的质子导电性.

Ashraf A A Elameen1,2, Arkadiusz Dawczak2, Tadeusz Miruszewski2

  • 1Department of Chemical and Physical Sciences, University of L'Aquila, L'Aquila, Italy.

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PubMed
概括
此摘要是机器生成的。

氧化物中的配置影响质子导电性. 在LaNbO4氧化物中引入更多的元素增强了质子传输,五元素组成显示了最高的导电性.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 固态化学 固态化学
  • 电化学 电化学 电化学

背景情况:

  • 氧化物中的质子导电性对于能源应用至关重要.
  • 配置是影响材料中离子运输的潜在因素.
  • 了解材料组成和质子导电性之间的关系对于开发先进的陶电解质至关重要.

研究的目的:

  • 为了研究配置对复杂氧化物中质子导电性的影响.
  • 为了合成和表征新的多元替代A位氧化物.
  • 在不同的大气和温度条件下评估这些材料的质子传输特性.

主要方法:

  • 合成了三种新型A位置换的ANbO4氧化物,其元素复杂度越来越高 (5,6和7元素).
  • 合成材料的表征使用技术来确认单相形成 (单临床费尔古索尼特结构).
  • 在干燥和潮湿的大气中测量电导率,温度范围为600-800°C,以确定质子导率.

主要成果:

  • 所有合成的样本都保持了同质的单相单临床费尔古索尼特结构.
  • 在所有样本中观察到质子导电性,干燥和潮湿大气之间的导电性差异证明了这一点.
  • 具有五个元素 (La1/5 Nd1/5 Sm1/5 Gd1/5 Eu1/5NbO4) 的样本表现出最高的质子导电性,在潮湿的大气中在800°C时达到大约3.0 × 10^-6 S cm^-1.

结论:

  • 通过ANbO4氧化物中的多元素替代增加配置,可以积极影响质子导电性.
  • 合成的复杂氧化物显示出适度的质子导电性,这表明进一步优化的潜力.
  • 这项研究强调了构成障碍在设计质子导电陶材料中的重要性.