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相关概念视频

Hybridization of Atomic Orbitals I03:24

Hybridization of Atomic Orbitals I

The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
Lewis Acids and Bases02:16

Lewis Acids and Bases

This lesson delves into Lewis acids and bases in the context of the octet rule for electron-deficient compounds. Here, the concept is discussed, emphasizing the group 13 elements like boron or aluminium. Since group 13 elements possess three valence electrons, they form trivalent compounds with a sextet of electrons and a vacant orbital for the central atom. Consequently, these electron-deficient compounds accept electrons from other species to complete their octet in a chemical reaction. They...

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相关实验视频

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Synthesis and Microdiffraction at Extreme Pressures and Temperatures
07:26

Synthesis and Microdiffraction at Extreme Pressures and Temperatures

Published on: October 7, 2013

在高压下预测的-化合物.

Feng Peng1, Maosheng Miao, Hui Wang

  • 1State Key Laboratory of Superhard Materials, Jilin University, Changchun, People's Republic of China.

Journal of the American Chemical Society
|October 24, 2012
PubMed
概括

高压会诱导具有独特结合性的新玻化结构. 随着含量增加,-键从板块转变为链条和孤立离子.

科学领域:

  • 材料科学 材料科学 材料科学
  • 固态化学 固态化学
  • 计算化学的计算化学

背景情况:

  • 高压显著影响轻元素中的化学结合.
  • 在极端条件下预测新型材料结构具有挑战性.

研究的目的:

  • 研究压力下的-系统的相位稳定性和结构演变.
  • 确定新的石化玻化物及其结构特征.

主要方法:

  • 使用了采用粒子优化算法的无偏结构搜索.
  • 执行密度函数理论计算以评估相位稳定性.

主要成果:

  • 发现了四种新的静态度玻化物:Li(3) B(2),Li(2) B,Li(4) B和Li(6) B.
  • 观察到了-结合的过渡,从石墨状的板块变成了齐克扎克的链,二元体和与含量增加的孤立离子.
  • 这些结构变化归因于对的电荷转移引起的离子电荷升高.

结论:

  • 高压可以合成具有异常结构的新型玻化物.
  • -结合的演变提供了关于压力下的化学结合的见解.
  • 这些发现为新材料的实验合成提供了潜力.

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