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Atomic Structure01:33

Atomic Structure

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Overview
211.5K
Atomic Mass01:52

Atomic Mass

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Atoms — and the protons, neutrons, and electrons that compose them — are extremely small. For example, a carbon atom weighs less than 2 × 10−23 g. When describing the properties of tiny objects such as atoms, we use appropriately small units of measure, such as the atomic mass unit (amu). The amu was originally defined based on hydrogen, the lightest element, then later in terms of oxygen. Since 1961, it has been defined with regard to the most abundant isotope of carbon, atoms of which...
70.5K
Atomic Orbitals02:44

Atomic Orbitals

45.2K
An atomic orbital represents the three-dimensional regions in an atom where an electron has the highest probability to reside. The radial distribution function indicates the total probability of finding an electron within the thin shell at a distance r from the nucleus. The atomic orbitals have distinct shapes which are determined by l, the angular momentum quantum number. The orbitals are often drawn with a boundary surface, enclosing densest regions of the cloud.
45.2K
Bulk Modulus01:21

Bulk Modulus

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The bulk modulus is a scientific term used to describe a material's resistance to uniform compression. It is the proportionality constant that links a change in pressure to the resulting relative volume change.
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Hybridization of Atomic Orbitals I03:24

Hybridization of Atomic Orbitals I

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The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
67.8K
The Energies of Atomic Orbitals03:21

The Energies of Atomic Orbitals

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In an atom, the negatively charged electrons are attracted to the positively charged nucleus. In a multielectron atom, electron-electron repulsions are also observed. The attractive and repulsive forces are dependent on the distance between the particles, as well as the sign and magnitude of the charges on the individual particles. When the charges on the particles are opposite, they attract each other. If both particles have the same charge, they repel each other.
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関連する実験動画

Updated: Feb 13, 2026

Processing of Bulk Nanocrystalline Metals at the US Army Research Laboratory
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大量に4H-NbSe2を原子的に薄くする体制に向かって,層間の乱れがある.

Edoardo Martino1, Alla Arakcheeva1, Helmuth Berger1

  • 1École Polytechnique Fédérale de Lausanne (EPFL), Institute of Physics, Lausanne, Switzerland.

NPJ 2D materials and applications
|February 12, 2026
PubMed
まとめ

4Ha-NbSe2における乱雑なスタッキングは,層の相関性を妨げ,バルク結晶を2D物理に押し進める. この構造的障害は,2Ha-NbSe2と比較して,強化された抵抗性アニソトロピーと重要なフィールドを説明します.

キーワード:
電子的性質と電子材料について超伝導特性と材料の超伝導性について

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科学分野:

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

背景:

  • 移行金属二カルコゲン化物 (TMD) のポリタイプ主義は,層状のヴァン・デル・ワールズ材料で調節可能な電子特性を提供します.
  • より大きな単元細胞のポリタイプは,4層または6層の構造のように,エキゾチックな電子状態の可能性のある自然なホモ構造として機能します.

研究 の 目的:

  • 金属および超伝導体4Ha-NbSe2の構造および電荷輸送特性を調査する.
  • 4Ha-NbSe2の構造的な乱れが,その電子的および超伝導的特性にどのように影響するかを理解する.

主な方法:

  • 詳細な非平面抵抗力測定. 詳細な非平面抵抗力測定. 詳細な非平面抵抗力測定. 詳細な非平面抵抗力測定.
  • 4Ha-NbSe2の構造的特徴について.
  • 2Ha-NbSe2との比較分析を行った.

主要な成果:

  • 4Ha-NbSe2は,高度に乱れた層の積み重ねを示し,層間の一貫性を妨げています.
  • この乱れは,散発物質を原子的に薄い限界に効果的に移行させます.
  • 2Ha-NbSe2と比較して,乱れた構造が強化された抵抗性アニソトロピーと超伝導性の上臨界場を説明する.

結論:

  • 4Ha-NbSe2における無秩序なスタッキングは,その観測された電子特性にとって極めて重要です.
  • この現象は,塊結晶における準二次元物理を誘導するために活用することができます.
  • 徹底した構造分析は,大型単細胞TMDポリタイプの研究に不可欠です.