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Metallic Solids02:37

Metallic Solids

21.1K
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....
21.1K
Structures of Solids02:22

Structures of Solids

19.8K
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...
19.8K
Ionic Crystal Structures02:42

Ionic Crystal Structures

19.0K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
19.0K
Structural Isomerism02:34

Structural Isomerism

21.9K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
21.9K
Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

4.1K
Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
4.1K
Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

13.4K
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...
13.4K

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Updated: Feb 28, 2026

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

Published on: June 7, 2018

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非晶質ヒ素における中距離構造秩序

Yuanbin Liu1, Yuxing Zhou1, Richard Ademuwagun1

  • 1Inorganic Chemistry Laboratory, Department of Chemistry, University of Oxford, Oxford OX1 3QR, U.K.

Journal of the American Chemical Society
|February 26, 2026
PubMed
まとめ
この要約は機械生成です。

研究者らは、機械学習された原子論的シミュレーションを用いて、非晶質ヒ素（a-As）における中距離秩序（MRO）を明らかにしました。この研究はMROを明確にします

キーワード:
非晶質ヒ素中距離秩序機械学習原子論的シミュレーション構造因子構造非晶質リン

さらに関連する動画

A Method to Preserve Wetland Roots and Rhizospheres for Elemental Imaging
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Preparation of Large-area Vertical 2D Crystal Hetero-structures Through the Sulfurization of Transition Metal Films for Device Fabrication
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Preparation of Large-area Vertical 2D Crystal Hetero-structures Through the Sulfurization of Transition Metal Films for Device Fabrication

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関連する実験動画

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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
08:55

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

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A Method to Preserve Wetland Roots and Rhizospheres for Elemental Imaging
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Preparation of Large-area Vertical 2D Crystal Hetero-structures Through the Sulfurization of Transition Metal Films for Device Fabrication
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科学分野:

  • 材料科学
  • 物性物理学
  • 計算化学

背景:

  • 中距離秩序（MRO）は非晶質材料において重要ですが、十分に理解されていません。
  • ヒ素（a-As）のような非晶質元素系におけるMROの理解は不可欠です。

研究 の 目的:

  • 非晶質ヒ素（a-As）におけるMROの起源と性質を解明すること。
  • a-Asと非晶質リン（a-P）の構造特性を比較すること。
  • a-Asおよびa-Pの圧力依存構造挙動を調査すること。

主な方法:

  • 機械学習ポテンシャルを利用した高度な原子論的シミュレーション。
  • 機械学習ポテンシャルを導出するための自動ワークフロー。
  • a-Asの実験データとのシミュレーション構造因子の比較。

主要な成果:

  • シミュレーションは、最初のシャープ回折ピーク（FSDP）を含む、a-Asの実験的構造因子を正確に再現します。
  • 非晶質ヒ素は、非晶質リンよりも均一な二面角分布を示し、連続ランダムネットワークと一致しています。
  • a-AsにおけるFSDPは、非晶質ネットワーク内のボイドサイズと分布に関連しています。

結論:

  • この研究は、非晶質ヒ素におけるMROに関する基本的な洞察を提供します。
  • この発見は、原子論的シミュレーションのための自動機械学習の有用性を強調しています。
  • 非晶質ヒ素の構造は、3配位連続ランダムネットワークとして最もよく記述されます。