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相关概念视频

Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

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

Trends in Lattice Energy: Ion Size and Charge

24.0K
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:
24.0K
Predicting Molecular Geometry02:27

Predicting Molecular Geometry

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VSEPR Theory for Determination of Electron Pair Geometries
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Metallic Solids02:37

Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
18.5K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

26.7K
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...
26.7K
Ionic Crystal Structures02:42

Ionic Crystal Structures

14.4K
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...
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Spark Plasma Sintering Apparatus Used for the Formation of Strontium Titanate Bicrystals
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在TiS2中的压力调制晶格结构演变2

Dengman Feng1, Jian Zhu1, Liang Li1

  • 1Synergetic Extreme Condition High-Pressure Science Center, State Key Laboratory of Superhard Materials, College of Physics, Jilin University, 130012, China. zhouqiang@jlu.edu.cn.

Physical chemistry chemical physics : PCCP
|September 23, 2023
PubMed
概括
此摘要是机器生成的。

研究人员开发了一种简单的化学蒸汽运输方法,用于二硫化 (TiS2). 高压拉曼光谱揭示了相位过渡,进步了对其电子拓状态和新设备潜力的理解.

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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
  • 固态化学 固态化学

背景情况:

  • 硫化 (TiS2) 是储能和热电应用的一个有前途的材料.
  • 高质量的TiS2的控制合成仍然是一个重大挑战.
  • 了解其在压力下的相位转换对于探索新型电子性质至关重要.

研究的目的:

  • 介绍TiS2.2的简单,单步化学蒸汽传输 (CVT) 合成方法.
  • 为了研究TiS2.2的压力诱导的相变.
  • 在高压下探索TiS2中的电子拓状态和物理现象.

主要方法:

  • 一步化学蒸汽传输 (CVT) 合成.
  • 高压 (HP) 拉曼光谱法.
  • 第一原则计算.第一原则计算.

主要成果:

  • 为TiS2合成建立了一个简单且广泛可访问的单步CVT方法.
  • TiS2在16.0 GPa (第一阶段到第二阶段,C2/m) 和32.4 GPa (第二阶段到第三阶段,P6̄2m) 经历相变.
  • 在韦尔半金属阶段内确定了TiS2的高压相.

结论:

  • 这项研究为TiS2.2提供了一个简化的合成途径.
  • 发现的高压相和过渡为TiS2.2的电子拓状态提供了新的见解.
  • 这项研究促进了新型电子设备的开发和对材料性质的基本理解.