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関連する概念動画

Bonding in Metals02:32

Bonding in Metals

47.9K
Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”. 
47.9K
Metallic Solids02:37

Metallic Solids

18.6K
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....
18.6K
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

21.4K
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
21.4K
Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

499
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...
499
Conductors and Insulators01:19

Conductors and Insulators

9.0K
Some materials may easily let electrical charges pass through them, while others obstruct their flow. The former are called conductors and the latter insulators. The atomic structures of materials determine whether they are conductors or insulators of electricity.
Most metals are conductors. Their atomic configuration is such that one or more electron(s) are loosely bound to the nucleus in each atom. Thus, a sea of mobile electrons are available in them, known as free electrons. Their easy...
9.0K
Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

467
In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
467

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金属よりも奇妙だ

Philip W Phillips1, Nigel E Hussey2,3, Peter Abbamonte4

  • 1Department of Physics and Institute for Condensed Matter Theory, University of Illinois, Urbana, IL 61801, USA.

Science (New York, N.Y.)
|July 20, 2022
PubMed
まとめ
この要約は機械生成です。

奇妙な金属は 伝統的な物理に逆らって 異常な電気抵抗性を示します このレビューでは,それらのユニークな性質を調査し,それらの連続的な電荷キャリア行動の背後にある統一原理を探求します.

さらに関連する動画

Imaging Metals in Brain Tissue by Laser Ablation - Inductively Coupled Plasma - Mass Spectrometry LA-ICP-MS
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Handheld Metal Detector Screening for Metallic Foreign Body Ingestion in Children
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Imaging Metals in Brain Tissue by Laser Ablation - Inductively Coupled Plasma - Mass Spectrometry LA-ICP-MS
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Handheld Metal Detector Screening for Metallic Foreign Body Ingestion in Children
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科学分野:

  • 凝縮物質物理学
  • 材料科学
  • 量子力学について

背景:

  • 伝統的な金属は,異なる物理的メカニズムにより,低温または高温で抵抗性が消失します.
  • "奇妙な"金属と呼ばれる材料のクラスは 電気抵抗性の異常な温度依存性を示し,従来の理解に挑戦しています.

研究 の 目的:

  • 異質な金属候補とその輸送とスペクトロスコピクデータをレビューする.
  • 奇妙な金属の振る舞いを支配する 物理的原理を特定する
  • これらの材料の低温と高温での電荷媒体の連続性を調査する.

主な方法:

  • 異種金属候補における輸送データの分析
  • 電子特性を理解するために,光譜データを分析する.
  • 量子批判性やプランク分散を含む理論的概念のレビュー.

主要な成果:

  • 異質な金属は,従来の金属で観察された抵抗性の典型的な温度依存性を侵害することができます.
  • 絶対ゼロに近い抵抗性の傾きの変化,または平均自由経路が格子定数に近づくにつれて,連続する可能性があります.
  • 証拠は,広範囲の温度範囲で 充電媒体の連続性を示唆しています.

結論:

  • 奇妙な金属は 凝縮物質の理論に 独特の挑戦を呈しています
  • 量子批判性,プランク散乱,モットネスへのさらなる調査は重要だ.
  • 奇妙な金属における非局所輸送現象を説明するために,新しいゲージ原理が必要になるかもしれない.