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相关概念视频

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...
Metallic Solids02:37

Metallic Solids

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. Many...
Semiconductors01:22

Semiconductors

There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The semiconductor's...
Colors and Magnetism03:02

Colors and Magnetism

Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
Schottky Barrier Diode01:27

Schottky Barrier Diode

Schottky barrier diodes are specialized semiconductor devices characterized by their unique construction. This construction involves combining a metal layer with a moderately doped n-type semiconductor material. This combination leads to the formation of a Schottky barrier, a pivotal element that defines the diode's operational characteristics. The core functionality of Schottky barrier diodes is their capacity to allow current to flow in only one direction due to their distinctive...

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Probing C84-embedded Si Substrate Using Scanning Probe Microscopy and Molecular Dynamics
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变态稳定Cd4Sb3:一种具有半导体性质的复杂结构的金属间化合物.

Andreas Tengå1, Sven Lidin, Jean-Philippe Belieres

  • 1Inorganic Chemistry, Stockholm University, SE-10691 Stockholm, Sweden.

Journal of the American Chemical Society
|November 14, 2008
PubMed
概括
此摘要是机器生成的。

合成和特征化了转基稳定的金属间化合物- (Cd4Sb3),揭示了其狭间半导体特性和异常低的导热性. 这种材料表现出可逆的秩序-混乱过渡,并在更高的温度下分解.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 固态化学 固态化学
  • 凝聚物质物理学 凝聚物质物理学

背景情况:

  • 二元金属间化合物- (Cd4Sb3) 是一个转移稳定的相.
  • 了解其结构和电子特性对于潜在的热电应用至关重要.

研究的目的:

  • 为了合成和表征转移稳定的Cd4Sb3化合物.
  • 研究其结构性,热性和电子性质,包括相位转换和热电行为.

主要方法:

  • 固体测量Cd-Sb融被灭,以获得多晶金条.
  • 使用 (Bi) 或锡 (Sn) 流来生长毫米大小的晶体.
  • 使用X射线衍射来确定晶体结构和相位过渡.
  • 在一个温度范围内进行电电阻和热功率测量.
  • 测量热导率以评估传热特性.

主要成果:

  • Cd4Sb3 结晶成一个单临床结构 (空间组 Pn),其公式单位是 Cd13Sb10.
  • 一个可逆的秩序-混乱过渡发生在373K,混乱的阶段是rhombohedral.
  • 该化合物表现出狭间半导体行为,具有独特的电阻的温度依赖性.
  • 观察到低热导率,低于1W/mK,高于130K,与无形材料相比.
  • 用Sn杂的流体培养样本显示显著增加了热力和电阻力.

结论:

  • Cd4Sb3是一种结构复杂的可变性金属间化合物,由于其低导热性,具有有前途的热电特性.
  • 观察到的秩序-混乱过渡和半导体特性需要进一步研究热电器件应用.
  • 像锡这样的补充剂对热电性能的影响突出了材料优化潜力.