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相关概念视频

Trends in Lattice Energy: Ion Size and Charge02:54

Trends in Lattice Energy: Ion Size and Charge

24.4K
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:
24.4K
Metallic Solids02:37

Metallic Solids

19.0K
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....
19.0K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

28.0K
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...
28.0K

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相关实验视频

Updated: Sep 19, 2025

Atom Probe Tomography Studies on the CuIn,GaSe2 Grain Boundaries
09:51

Atom Probe Tomography Studies on the CuIn,GaSe2 Grain Boundaries

Published on: April 22, 2013

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高压结构和晶格动态研究α-In2Se3Se3的研究.

Shiyu Feng1,2, Baihong Sun1,2, Wenting Lu1,2

  • 1Department of Materials Science and Engineering, Guangdong Technion-Israel Institute of Technology, Shantou 515063, China.

The Journal of chemical physics
|June 18, 2025
PubMed
概括

高压将分层的化 (In2Se3) 从阿尔法相转化为1GPa左右的单临性β-prime结构. 这种β-prime阶段保持稳定至45GPa,然后过渡到新型的形阶段.

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Synthesis and Microdiffraction at Extreme Pressures and Temperatures
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Last Updated: Sep 19, 2025

Atom Probe Tomography Studies on the CuIn,GaSe2 Grain Boundaries
09:51

Atom Probe Tomography Studies on the CuIn,GaSe2 Grain Boundaries

Published on: April 22, 2013

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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:

  • 有层的化 (In2Se3) 具有独特的电子和光学特性.
  • 了解其在极端条件下的结构行为对于潜在的应用至关重要.

研究的目的:

  • 在高压下研究分层α-In2Se3的结构相变.
  • 为了确定不同In2Se3相的稳定范围,高达60+GPa.

主要方法:

  • 在现场同步子角度分散粉末X射线衍射 (XRD).
  • 拉曼光谱法 拉曼光谱法
  • 钻石天电池 (DAC) 用于高压生成.
  • 作为液态压力传递介质.

主要成果:

  • 由压力诱导的相位从α-In2Se3过渡到单临床β'-In2Se3在大约1GPa.
  • β'-In2Se3阶段稳定到45 GPa,没有证据表明过渡到之前报告的β-In2Se3阶段.
  • 在45GPa以上,In2Se3转化为一个无序的固体溶液类型的正方形结构 (第四阶段).

结论:

  • In2Se3的高压结构演变比以前理解的要复杂得多.
  • 稳定的β'-In2Se3阶段的发现和新型的正方形相 IV 提供了对分层石灰的压力依赖行为的新见解.