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関連する概念動画

Structures of Solids02:22

Structures of Solids

14.6K
Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
14.6K
Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

9.9K
The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
Types of Unit Cells
Imagine taking a large number of identical...
9.9K
Metallic Solids02:37

Metallic Solids

18.7K
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....
18.7K
Molecular and Ionic Solids02:54

Molecular and Ionic Solids

17.5K
Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
17.5K
Periodic Classification of the Elements04:00

Periodic Classification of the Elements

46.8K
The periodic table arranges atoms based on increasing atomic number so that elements with the same chemical properties recur periodically. When their electron configurations are added to the table, a periodic recurrence of similar electron configurations in the outer shells of these elements is observed. Because they are in the outer shells of an atom, valence electrons play the most important role in chemical reactions. The outer electrons have the highest energy of the electrons in an atom...
46.8K
Properties of Laplace Transform-II01:16

Properties of Laplace Transform-II

296
Time differentiation, convolution, integration, and periodicity are fundamental concepts in analyzing functions and signals over time. Each concept provides a unique perspective on how functions evolve, interact, and repeat, offering essential tools for various scientific and engineering applications.
Time differentiation involves analyzing the rate of change of a function over time. Mathematically, it is the derivative of a function with respect to time. This concept can be likened to tracking...
296

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Updated: Sep 10, 2025

Comprehensive Characterization of Extended Defects in Semiconductor Materials by a Scanning Electron Microscope
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Comprehensive Characterization of Extended Defects in Semiconductor Materials by a Scanning Electron Microscope

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周期的な固体の非周期的な欠陥

Robert H Lavroff1, Daniel Kats2, Lorenzo Maschio3

  • 1Department of Chemistry and Biochemistry, University of California Los Angeles, Los Angeles, California 90095, USA.

The Journal of chemical physics
|August 25, 2025
PubMed
まとめ
この要約は機械生成です。

この研究は,材料の欠陥をモデル化するための欠陥のない埋め込み方法を導入します. このアプローチは,周期的なスーパーセルからのアーティファクトを回避し,正確な欠陥シミュレーションのための熱力学限界 (TDL) へのより速い収束を可能にします.

さらに関連する動画

Quantitative Atomic-Site Analysis of Functional Dopants/Point Defects in Crystalline Materials by Electron-Channeling-Enhanced Microanalysis
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Quantitative Atomic-Site Analysis of Functional Dopants/Point Defects in Crystalline Materials by Electron-Channeling-Enhanced Microanalysis

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Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials
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Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials

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関連する実験動画

Last Updated: Sep 10, 2025

Comprehensive Characterization of Extended Defects in Semiconductor Materials by a Scanning Electron Microscope
11:14

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Quantitative Atomic-Site Analysis of Functional Dopants/Point Defects in Crystalline Materials by Electron-Channeling-Enhanced Microanalysis
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Quantitative Atomic-Site Analysis of Functional Dopants/Point Defects in Crystalline Materials by Electron-Channeling-Enhanced Microanalysis

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Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials
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Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials

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科学分野:

  • コンピューティング用材料科学
  • 量子化学について
  • 固体物理学

背景:

  • 伝統的な欠陥モデリングは周期的なスーパーセルを使用し,欠陥画像の相互作用からアーティファクトを危険にさらします.
  • 充電または開いた殻の欠陥は問題を悪化させ,熱力学限界 (TDL) への収束を遅らせる.

研究 の 目的:

  • 周期的な超細胞の限界を克服する欠陥モデリングのための新しい計算方法を開発する.
  • 充電され,強く相関するものを含む欠陥の正確で効率的なシミュレーションを達成するために.

主な方法:

  • "欠陥のない"組み込み形式主義を導入した.
  • 原始的なユニット・セル計算で 埋め込みフィールドを計算した
  • 埋め込まれた断片に単一の,無周期的な欠陥を組み込み,背景料の補償を回避しました.

主要な成果:

  • 定期的な欠陥モデリングに関連した虚偽のアーティファクトと数値的な問題を排除しました.
  • 熱力学限界 (TDL) に非常に速い収束を達成しました.
  • ハートリー・フォック後の方法が複雑な欠陥の研究に直接適用できる.

結論:

  • 欠陥のない埋め込み形式主義は,正確な欠陥モデリングのための優れたアプローチを提供します.
  • この方法は,充電された,オープンシェル,および強く相関する欠陥に特に有利です.
  • 局所的な興奮状態や材料科学の他の挑戦的な問題を研究するための堅固な枠組みを提供します.