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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...
Nuclear Transmutation03:20

Nuclear Transmutation

Nuclear transmutation is the conversion of one nuclide into another. It can occur by the radioactive decay of a nucleus, or the reaction of a nucleus with another particle. The first manmade nucleus was produced in Ernest Rutherford’s laboratory in 1919 by a transmutation reaction, the bombardment of one type of nuclei with other nuclei or with neutrons. Rutherford bombarded nitrogen-14 atoms with high-speed α particles from a natural radioactive isotope of radium and observed protons being...
Valence Bond Theory02:42

Valence Bond Theory

Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
Electron Configuration of Multielectron Atoms03:26

Electron Configuration of Multielectron Atoms

The alkali metal sodium (atomic number 11) has one more electron than the neon atom. This electron must go into the lowest-energy subshell available, the 3s orbital, giving a 1s22s22p63s1 configuration. The electrons occupying the outermost shell orbital(s) (highest value of n) are called valence electrons, and those occupying the inner shell orbitals are called core electrons. Since the core electron shells correspond to noble gas electron configurations, we can abbreviate electron...
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:
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...

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相关实验视频

Updated: Jun 19, 2026

U2O5 Film Preparation via UO2 Deposition by Direct Current Sputtering and Successive Oxidation and Reduction with Atomic Oxygen and Atomic Hydrogen
12:05

U2O5 Film Preparation via UO2 Deposition by Direct Current Sputtering and Successive Oxidation and Reduction with Atomic Oxygen and Atomic Hydrogen

Published on: February 21, 2019

Cs(2)K(UO)(2)Si(4)O(12):是一种混合价值的 (IV,V) 酸盐.

Cheng-Shiuan Lee1, Sue-Lein Wang, Kwang-Hwa Lii

  • 1Department of Chemistry, National Tsing Hua University, Hsinchu, Taiwan, ROC.

Journal of the American Chemical Society
|October 8, 2009
PubMed
概括

科学家们利用高温,高压水热方法合成了第一个混合价值酸盐. 这种新型材料具有和-氧多面体的独特3D框架.

科学领域:

  • 材料科学 材料科学 材料科学
  • 无机化学 无机化学
  • 地质化学 地质化学

背景情况:

  • 混合价值化合物具有独特的电子和磁性特性.
  • 酸在核废物管理和地球化学方面具有重要意义.
  • 以前在热水条件下混合价值酸盐的合成是有限的.

研究的目的:

  • 合成和表征第一个混合价值 ((IV,V) 酸盐.
  • 为了阐明这种新型化合物的晶体结构和结合.
  • 为了确认合成材料中的价值状态.

主要方法:

  • 高温,高压的热水合成.
  • 单晶X射线衍射用于结构确定.
  • X射线光电子光谱 (XPS) 和X射线吸收近边缘结构 (XANES) 用于价值状态分析.

主要成果:

  • 成功合成了一种新的混合价值 ((IV,V) 酸盐.
  • 一个3D框架结构的确定,该结构由共享角的U(IV,V) O(6) 八面体组成,由Si(4) O(12) 环相互连接.
  • XPS和XANES光谱证实了 (IV) 和 (V) 氧化状态的共存.

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Activating Molecules, Ions, and Solid Particles with Acoustic Cavitation
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Activating Molecules, Ions, and Solid Particles with Acoustic Cavitation

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Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride
04:51

Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride

Published on: July 8, 2021

相关实验视频

Last Updated: Jun 19, 2026

U2O5 Film Preparation via UO2 Deposition by Direct Current Sputtering and Successive Oxidation and Reduction with Atomic Oxygen and Atomic Hydrogen
12:05

U2O5 Film Preparation via UO2 Deposition by Direct Current Sputtering and Successive Oxidation and Reduction with Atomic Oxygen and Atomic Hydrogen

Published on: February 21, 2019

Activating Molecules, Ions, and Solid Particles with Acoustic Cavitation
14:22

Activating Molecules, Ions, and Solid Particles with Acoustic Cavitation

Published on: April 11, 2014

Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride
04:51

Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride

Published on: July 8, 2021

结论:

  • 该研究报告说,首次合成了混合价值酸.
  • 独特的3D框架结构为协调化学提供了洞察力.
  • 这种材料可能对理解地质环境和核材料中的行为产生影响.