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相关概念视频

Ionic Crystal Structures02:42

Ionic Crystal Structures

14.7K
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...
14.7K
Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

42.2K
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. 
42.2K
Formal Charges02:42

Formal Charges

33.7K
In some cases, there are seemingly more than one valid Lewis structures for molecules and polyatomic ions. The concept of formal charges can be used to help predict the most appropriate Lewis structure when more than one reasonable structure exists.
33.7K
Alkyl Halides02:45

Alkyl Halides

17.3K
Structural Properties
Alkyl halides are halogen-substituted alkanes wherein one or more hydrogen atoms of an alkane is replaced by a halogen atom such as fluorine, chlorine, bromine, or iodine. The carbon atom in an alkyl halide is bonded to the halogen atom, which is sp3-hybridized and exhibits a tetrahedral shape.
Unlike alkyl halides, compounds in which a halogen atom is bonded to an sp2 -hybridized carbon atom of a carbon-carbon double bond (C=C) are called vinyl halides. Whereas aryl...
17.3K
Trends in Lattice Energy: Ion Size and Charge02:54

Trends in Lattice Energy: Ion Size and Charge

24.2K
An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
24.2K
Predicting Molecular Geometry02:27

Predicting Molecular Geometry

35.9K
VSEPR Theory for Determination of Electron Pair Geometries
35.9K

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Updated: Sep 8, 2025

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
06:44

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding

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素替代36:洞察进化的结构,组成和离子导电性.

Zhongqi Lin1, Fuwei Wen1, Trinanjan Dey1

  • 1Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada.

The journal of physical chemistry letters
|July 7, 2025
PubMed
概括

研究了用于固态电池的Li3InCl6中的素替代. 将更换为,或减少了离子导电性,表明极化性不是关键因素.

科学领域:

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

背景情况:

  • 含的三级化物对全固态电池具有前景,因为其高离子导电性和结构性可调性.
  • 3InCl6是一种候选材料,但其性能可以通过结构修改 (如素替代) 来提高.

研究的目的:

  • 研究素替代 (F,Br,I) 对Li3InCl6.6的结构和Li+导电性的影响.
  • 为了确定Li3InCl6网格中不同素的固体溶解度极限.
  • 了解素替代,材料结构和离子运输特性之间的关系.

主要方法:

  • 合成具有不同素成分 (X = F, Br, I) 的Li3InCl6-xXx样本.
  • 使用X射线衍射 (XRD) 进行相位组成和晶体结构的表征.
  • 通过阻抗光谱测量对Li+导电性的评估.

主要成果:

  • 对的替代被观察到x ≤ 1.2.
  • 固体可溶性极限被确定为的x = 0.6和的x < 0.1.
  • 离子导电性随着X的替代水平的增加而下降,特别是当二次低导电性相形成时.

结论:

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  • 在Li3InCl6中素替代对Li+导电性产生负面影响,这与基于极化性的潜在预期相反.
  • 二次相的形成大大阻碍了离子运输.
  • 替代素 (X) 的极化性增加并不是这些材料中 Li+ 流动性的主要因素.