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相关概念视频

Ionic Crystal Structures02:42

Ionic Crystal Structures

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...
Lewis Structures of Molecular Compounds and Polyatomic Ions02:54

Lewis Structures of Molecular Compounds and Polyatomic Ions

To draw Lewis structures for complicated molecules and molecular ions, it is helpful to follow a step-by-step procedure as outlined:
Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

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.
Trends in Lattice Energy: Ion Size and Charge02:54

Trends in Lattice Energy: Ion Size and Charge

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:
Exceptions to the Octet Rule02:55

Exceptions to the Octet Rule

Many covalent molecules have central atoms that do not have eight electrons in their Lewis structures. These molecules fall into three categories:
Predicting Molecular Geometry02:27

Predicting Molecular Geometry

VSEPR Theory for Determination of Electron Pair Geometries

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Molten-Salt Synthesis of Complex Metal Oxide Nanoparticles
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Published on: October 27, 2018

2FeSiO4 的结构

Shin-ichi Nishimura1, Shogo Hayase, Ryoji Kanno

  • 1Department of Electronic Chemistry, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, 4259 Nagatsuta, Yokohama, 226-8502, Japan.

Journal of the American Chemical Society
|September 16, 2008
PubMed
概括

研究人员确定了铁酸盐的晶体结构,这是一个有希望的阴极材料,用于更绿色的离子电池. 这种新的结构比以前的模型更大,起源于调制的四面体,推进了电池技术.

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:

  • 离子电池对于可持续的未来至关重要.
  • 铁酸盐 (LIS) 是一个有前途的阴极材料,由于元素的丰富性和多电子反应的潜力.
  • 作为LIS的关键成分Li2FeSiO4的晶体结构以前仍未确定.

研究的目的:

  • 为了阐明Li2FeSiO4.4的晶体结构.
  • 了解LIS阴极材料电化学性能的结构基础.

主要方法:

  • 高分辨率的同步龙X射线衍射.
  • 电子衍射实验. 电子衍射的实验.

主要成果:

  • 成功确定了Li2FeSiO4的晶体结构.
  • 确定的结构呈现出一个超级格子,其尺寸是以前基于β-Li3PO4的模型的两倍.
  • 超级网格的起源被确定为协调四面体的周期调制.

结论:

  • 确定的晶体结构为铁酸盐材料提供了基本的见解.
  • 这种结构理解对于优化下一代离子电池中LIS阴极性能至关重要.

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The Synthesis of [Sn10(Si(SiMe3)3)4]2- Using a Metastable Sn(I) Halide Solution Synthesized via a Co-condensation Technique

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  • 这些发现为开发先进的电池技术为更绿色的社会铺平了道路.