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関連する概念動画

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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Updated: Jun 28, 2026

Probing C84-embedded Si Substrate Using Scanning Probe Microscopy and Molecular Dynamics
13:58

Probing C84-embedded Si Substrate Using Scanning Probe Microscopy and Molecular Dynamics

Published on: September 28, 2016

メタスタブルCd4Sb3:半導体特性を持つ複雑な構造のインターメタリック化合物.

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
まとめ
この要約は機械生成です。

メタステーブルな金属間化合物であるカドミウム-アンチモニー (Cd4Sb3) を合成し,特徴づけ,その狭間半導体特性と極めて低い熱伝導性を明らかにした. この材料は,反転可能な秩序-乱雑の移行を示し,より高い温度で分解します.

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Close-Space Sublimation-Deposited Ultra-Thin CdSeTe/CdTe Solar Cells for Enhanced Short-Circuit Current Density and Photoluminescence
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Solution&#45;Processed, Surface&#45;Engineered, Polycrystalline CdSe&#45;SnSe Exhibiting Low Thermal Conductivity
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Close-Space Sublimation-Deposited Ultra-Thin CdSeTe/CdTe Solar Cells for Enhanced Short-Circuit Current Density and Photoluminescence
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Solution&#45;Processed, Surface&#45;Engineered, Polycrystalline CdSe&#45;SnSe Exhibiting Low Thermal Conductivity
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Solution-Processed, Surface-Engineered, Polycrystalline CdSe-SnSe Exhibiting Low Thermal Conductivity

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科学分野:

  • マテリアルサイエンス 材料科学
  • 固体化学 固体化学
  • 凝縮物質物理学 凝縮物質物理学

背景:

  • バイナリ金属間化合物カドミウム-アンチモニー (Cd4Sb3) は,メタスタブルな相である.
  • その構造的および電子的特性を理解することは,潜在的熱電学的アプリケーションにとって極めて重要です.

研究 の 目的:

  • メタステーブルなCd4Sb3化合物を合成し,特徴づけること.
  • その構造的,熱的,電子的性質を調査し,相変遷と熱電気的振る舞いを含む.

主な方法:

  • ステイキオメトリックCd-Sb溶液は,ポリクリスタルインゴットを得るため,消火されました.
  • ミリメートルの大きさの結晶は,ビスムート (Bi) またはスチーン (Sn) のフロースを使用して育てられました.
  • 結晶構造と相変遷を決定するために,X線 difraktion が使用されました.
  • 電気抵抗性と熱力の測定は,温度範囲で実施されました.
  • 熱伝導性が測定され,熱伝送特性を評価した.

主要な成果:

  • Cd4Sb3は,式単位Cd13Sb10.0を持つモノクリニック構造 (空間群Pn) で結晶化する.
  • 373 Kで反転可能な秩序-乱乱の移行が起こり,乱乱の段階はロンボエドールである.
  • この化合物は,抵抗性のユニークな温度依存性を持つ狭間半導体行動を示しています.
  • 130K以上で1W/mK未満の低熱伝導性が観察され,無形材料と比較できます.
  • Snでドーピングされたフリュース栽培のサンプルは,熱力および抵抗性の有意な増加を示した.

結論:

  • Cd4Sb3は,構造的に複雑で,低熱伝導性により有望な熱電気特性を持つ,転移性のある金属間化合物です.
  • 観測された秩序-乱雑の移行と半導体特性は,熱電器装置の応用についてさらなる調査を正当化します.
  • 亜鉛のようなドーパントが熱電性能に及ぼす影響は,材料の最適化の可能性を強調しています.