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関連する概念動画

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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関連する実験動画

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

TiNb2O7でイオンおよび電子伝導

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
まとめ
この要約は機械生成です。

チタン・ニオビウム酸化物 (TiNb2O7) は,リチウム化時に電子伝導性が著しく増加し,リチウムイオンエネルギー貯蔵の高速化を可能にします. リチウムの拡散は特定の地域では迅速ですが,高いリチウム濃度で妨げられます.

さらに関連する動画

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

関連する実験動画

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

科学分野:

  • 材料科学
  • 電気化学
  • 固体化学

背景:

  • チタン・ニオビウム酸化物 (TiNb2O7) は,高速度のリチウムイオンエネルギー貯蔵の可能性のあるワズリー・ロス相である.
  • TiNb2O7におけるリチウム挿入メカニズムとイオン伝導に関する基本的な理解は限られている.

研究 の 目的:

  • 実験的および計算的アプローチを組み合わせて,大量TiNb2O7の固有特性を解明する.
  • TiNb2O7のリチウム挿入機構とイオン伝導経路を理解する.

主な方法:

  • 電子とイオン伝導性を研究するために実験的技術 (例えば,NMRスペクトロスコーピー) が使用された.
  • 密度関数理論 (DFT) の計算を使用して,リチウム拡散経路とエネルギーバリアをモデル化しました.
  • 実験データと計算データを組み合わせることで 材料の特性についての洞察が得られました

主要な成果:

  • 電子伝導性はリチア化時に7度増加し,電子は局所化と非局所化の両方を表した.
  • リチウムの拡散は,単一のリドックス領域 (Li<=3TiNb2O7) の低活性化バリアで,D_Li = 10^-11 m^2 s^-1で525-650Kです.
  • イオン拡散はアニソトロピックであり,トンネルに沿ってブロックを越えるよりも著しく低い障壁がある.モビリティはマルチレドックス領域 (Li>3TiNb2O7) で妨げられる.

結論:

  • リチウムの挿入は,TiNb2O7のn型自己ドーピングと高速伝導につながりますが,イオン運動は最終的に高いリチウム化で妨げられます.
  • TiNb2O7の構造は,他のアルカリおよびアルカリ土金属イオンと比較して,Li+の移動性に特に適しています.
  • これらの特性を理解することは,リチウムイオン電池の高性能電極材料としてTiNb2O7を最適化するために不可欠です.