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関連する概念動画

Metallic Solids02:37

Metallic Solids

16.5K
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...
16.5K
Exceptions to the Octet Rule02:55

Exceptions to the Octet Rule

31.5K
Many covalent molecules have central atoms that do not have eight electrons in their Lewis structures. These molecules fall into three categories:
31.5K
Hybridization of Atomic Orbitals I03:24

Hybridization of Atomic Orbitals I

51.8K
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...
51.8K
Coordination Number and Geometry02:57

Coordination Number and Geometry

15.6K
For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
15.6K
Network Covalent Solids02:18

Network Covalent Solids

12.9K
Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
12.9K
Valence Bond Theory02:42

Valence Bond Theory

8.9K
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...
8.9K

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関連する実験動画

Updated: May 6, 2026

Negative Additive Manufacturing of Complex Shaped Boron Carbides
06:45

Negative Additive Manufacturing of Complex Shaped Boron Carbides

Published on: September 18, 2018

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3次元メタリック・ボロン・ニトリド

Shunhong Zhang1, Qian Wang, Yoshiyuki Kawazoe

  • 1Center for Applied Physics and Technology, College of Engineering, Peking University , Beijing 100871, China.

Journal of the American Chemical Society
|November 7, 2013
PubMed
まとめ
この要約は機械生成です。

ボロン・ニトリド (BN) は,典型的には断熱剤である. 研究者は,動的に安定し,金属であり,非局所化されたB2p電子によって駆動されるBNの新しい四角形相を提案しています.

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Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations
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Fabrication of Three-Dimensional Graphene-Based Polyhedrons via Origami-Like Self-Folding
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Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations
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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
  • コンピューティング・ケミストリー

背景:

  • ボロン窒化物 (BN) と炭素は,sp2およびsp3結合により,類似した構造 (1Dナノチューブ,2Dナノシート,3Dダイヤモンド) を共有しています.
  • 炭素とは異なり,BNは一貫してすべての次元と構造にわたって電気断熱剤です.
  • 既存のBN材料は,電気伝導性を要求するアプリケーションでは限られています.

研究 の 目的:

  • ボロン・ニトリド (BN) の新しい相を理論的に提案し,調査する.
  • この提案されたBNフェーズの構造的安定性と電子特性を決定する.
  • 先進的な材料のアプリケーションのためのこの新しいBN段階の可能性を調査する.

主な方法:

  • 最先端の理論的計算を用いて計算する.
  • 動的安定性分析を実行する.
  • バンド構造,状態の密度,および電子の位置づけ関数を分析する.

主要な成果:

  • 理論的には,ボロン窒化物 (BN) の新しい四角形相が提案されました.
  • この四角形BN相は,動的に安定していることが判明しました.
  • 提案されたBN相は,B2p電子が非局所化しているため,メタリックな行動を示す.

結論:

  • 金属で安定した四角形BN相の発見は,BNの絶縁性についての従来の理解に挑戦しています.
  • 金属の性質は,電子構造分析によって確認された,B2p電子の非局所化から生じる.
  • この金属BNは,セラミックや電子機器のアプリケーションを超えた新しい材料を可能にします.