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相关概念视频

Valence Bond Theory02:42

Valence Bond Theory

8.5K
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...
8.5K
Molecular and Ionic Solids02:54

Molecular and Ionic Solids

17.1K
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...
17.1K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

42.4K
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
42.4K
Ionic Crystal Structures02:42

Ionic Crystal Structures

14.3K
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...
14.3K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

26.4K
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...
26.4K
Trends in Lattice Energy: Ion Size and Charge02:54

Trends in Lattice Energy: Ion Size and Charge

23.8K
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:
23.8K

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相关实验视频

Updated: Jun 25, 2025

Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model
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Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model

Published on: May 23, 2018

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二维硫化物:合成,原子结构工程和电荷密度波.

Camiel van Efferen1, Joshua Hall1, Nicolae Atodiresei2

  • 1II. Physikalisches Institut, Universität zu Köln, Zülpicher Straße 77, 50937 Köln, Germany.

ACS nano
|May 21, 2024
PubMed
概括
此摘要是机器生成的。

研究人员使用分子束表合成了新的二维硫化物材料V4S7和V5S8,使用分子束表. 这些材料具有独特的结构和充电密度波,为先进的电子应用铺平了道路.

关键词:
两维材料是二维材料.在V5S8中,V5S8是V5S8.在VS2中,VS2是VS2.原子结构工程 原子结构工程电荷密度波是指电荷密度波.层的依赖性 层的依赖性过渡金属二甲基二甲基化物

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Fabricating van der Waals Heterostructures with Precise Rotational Alignment
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Fabricating van der Waals Heterostructures with Precise Rotational Alignment

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Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations
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Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations

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相关实验视频

Last Updated: Jun 25, 2025

Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model
11:10

Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model

Published on: May 23, 2018

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Fabricating van der Waals Heterostructures with Precise Rotational Alignment
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Fabricating van der Waals Heterostructures with Precise Rotational Alignment

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Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations
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科学领域:

  • 材料科学 材料科学 材料科学
  • 凝聚物质物理学 凝聚物质物理学
  • 纳米技术纳米技术

背景情况:

  • 二维 (2D) 材料具有独特的电子和物理性能.
  • 二硫化物 (VS2) 是一个有前途的二维材料,具有潜在的应用.
  • 对2D材料中特定的固体几何学和结构的控制合成仍然具有挑战性.

研究的目的:

  • 根据VS2.2,合成和表征新的,最终薄的富含的2D材料,基于VS2.
  • 为了确定这些合成材料的原子结构.
  • 为了研究V5S8衍生结构中的电子特性,特别是电荷密度波.

主要方法:

  • 用于材料合成的分子束表 (MBE).
  • 扫描道显微镜 (STM) 和光谱 (STS) 用于结构和电子表征.
  • 用于表面分析的X射线光辐射光谱学 (XPS).
  • 密度函数理论 (DFT) 计算用于原子结构的确定.

主要成果:

  • 成功合成了固体测量单层VS2和两个富含的相 (V4S7和V5S8衍生).
  • 通过 STM 和 DFT 确定了 S 枯竭 V4S7 阶段的原子结构.
  • 描述了2x2 V介层的自相接的V5S8衍生层,并研究了它们的电荷密度波.

结论:

  • 通过调整生长参数,可以通过MBE实现特定硫化物固态度的受控合成.
  • 合成的V4S7和V5S8衍生材料呈现出不同的原子排列和电子特性.
  • 该研究为新型二维硫化物提供了原子模型,并对它们的电荷密度波现象进行了洞察.