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相关概念视频

Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

48.8K
Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions. 
48.8K
Ionic Radii03:10

Ionic Radii

33.3K
Ionic radius is the measure used to describe the size of an ion. A cation always has fewer electrons and the same number of protons as the parent atom; it is smaller than the atom from which it is derived. For example, the covalent radius of an aluminum atom (1s22s22p63s23p1) is 118 pm, whereas the ionic radius of an Al3+ (1s22s22p6) is 68 pm. As electrons are removed from the outer valence shell, the remaining core electrons occupying smaller shells experience a greater effective nuclear...
33.3K
Ionic Bonds00:42

Ionic Bonds

128.9K
Overview
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
Opposing Charges Hold Ions Together in Ionic Compounds
Ionic bonds are reversible electrostatic interactions between ions...
128.9K
Molecular and Ionic Solids02:54

Molecular and Ionic Solids

19.9K
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...
19.9K
Solubility of Ionic Compounds02:55

Solubility of Ionic Compounds

68.0K
Solubility is the measure of the maximum amount of solute that can be dissolved in a given quantity of solvent at a given temperature and pressure. Solubility is usually measured in molarity (M) or moles per liter (mol/L). A compound is termed soluble if it dissolves in water.
68.0K
Ionic Crystal Structures02:42

Ionic Crystal Structures

16.8K
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...
16.8K

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相关实验视频

Updated: Jan 20, 2026

Electron Transfer from Metals to Nonmetals and Ionic Bonding
02:48

Electron Transfer from Metals to Nonmetals and Ionic Bonding

48.8K

在TiNb2O7中进行离子和电子导电

Kent J Griffith1, Ieuan D Seymour1,2, Michael A Hope1

  • 1Department of Chemistry , University of Cambridge , Cambridge CB2 1EW , United Kingdom.

Journal of the American Chemical Society
|September 6, 2019
PubMed
概括
此摘要是机器生成的。

氧化物 (TiNb2O7) 在化后显著增加电子导电性,使高速离子能量储存成为可能. 在特定区域的扩散速度很快,但在高度下受到阻碍.

更多相关视频

Ionic Radii: Periodic Trend and Ionic Radii of Isoelectronic Ions
03:10

Ionic Radii: Periodic Trend and Ionic Radii of Isoelectronic Ions

33.3K
Ionic Bonds and Electrolytes
00:42

Ionic Bonds and Electrolytes

128.9K

相关实验视频

Last Updated: Jan 20, 2026

Electron Transfer from Metals to Nonmetals and Ionic Bonding
02:48

Electron Transfer from Metals to Nonmetals and Ionic Bonding

48.8K
Ionic Radii: Periodic Trend and Ionic Radii of Isoelectronic Ions
03:10

Ionic Radii: Periodic Trend and Ionic Radii of Isoelectronic Ions

33.3K
Ionic Bonds and Electrolytes
00:42

Ionic Bonds and Electrolytes

128.9K

科学领域:

  • 材料科学
  • 电化学
  • 固态化学

背景情况:

  • 氧化物 (TiNb2O7) 是一个Wadsley-Roth相,具有高速离子能量储存的潜力.
  • 对于TiNb2O7中的插入机制和离子导电的基本理解是有限的.

研究的目的:

  • 通过结合实验和计算方法阐明散装TiNb2O7的固有特性.
  • 了解TiNb2O7中的插入机制和离子导电路.

主要方法:

  • 使用实验技术 (例如NMR光谱) 来研究电子和离子导电性.
  • 用密度功能理论 (DFT) 的计算来建模扩散途径和能量障碍.
  • 对实验和计算数据的综合分析提供了对材料属性的洞察.

主要成果:

  • 电子导电性在化时增加了七个数量级,电子表现出局部化和非局部化的特征.
  • 的扩散速度很快,单氧化区域的激活障碍很低 (Li<=3TiNb2O7),D_Li=10^-11 m^2 s^-1在525-650K.
  • 离子扩散是异构的,与跨道相比,沿道的障碍明显较低;在多反射区 (Li>3TiNb2O7) 中,移动性受到阻碍.

结论:

  • 插入导致TiNb2O7的n型自我和高速导,但在高化时,离子运动最终受到阻碍.
  • 与其他和土金属离子相比,TiNb2O7结构特别适合+流动性.
  • 了解这些特性对于优化TiNb2O7作为离子电池的高性能电极材料至关重要.