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Metallic Solids

Metallic Solids

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...

Structures of Solids

Structures of Solids

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...

Lattice Centering and Coordination Number

Lattice Centering and Coordination Number

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...

The Seven Crystal Systems: Overview

The Seven Crystal Systems: Overview

Crystals with various point group symmetries belong to different crystal classes, which are synonymous terms. Despite being in the same class, crystals may have distinct shapes, like cubes and octahedra. There are 32 three-dimensional point groups, all of which are systematically divided into seven crystal systems.The basic cubic crystal system, exemplified by NaCl, features orthogonal vectors (α = β = �� = 90°) of equal lengths (a = b = c). When specific...

Network Covalent Solids

Network Covalent Solids

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...

Molecular and Ionic Solids

Molecular and Ionic Solids

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...

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Updated: Apr 21, 2026

Spatial Separation of Molecular Conformers and Clusters

Spatial Separation of Molecular Conformers and Clusters

Published on: January 9, 2014

原子精度で階層的なクラスター固体を組み立てます.

Ari Turkiewicz¹, Daniel W Paley, Tiglet Besara

¹Department of Chemistry, Columbia University , New York, New York 10027, United States.

Journal of the American Chemical Society

|October 21, 2014

まとめ

この要約は機械生成です。

研究者はコバルトカルコゲン化物と酸化鉄の分子群を用いて,階層的な固体を作り出した. これらのバイナリイオン化合物は,原子と超原子の解像度を持つユニークな超構造を形成し,先進的な材料の洞察を提供します.

さらに関連する動画

Computation of Atmospheric Concentrations of Molecular Clusters from ab initio Thermochemistry

Computation of Atmospheric Concentrations of Molecular Clusters from ab initio Thermochemistry

Published on: April 8, 2020

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates

Published on: February 15, 2016

関連する実験動画

Last Updated: Apr 21, 2026

Spatial Separation of Molecular Conformers and Clusters

Spatial Separation of Molecular Conformers and Clusters

Published on: January 9, 2014

Computation of Atmospheric Concentrations of Molecular Clusters from ab initio Thermochemistry

Computation of Atmospheric Concentrations of Molecular Clusters from ab initio Thermochemistry

Published on: April 8, 2020

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates

Published on: February 15, 2016

科学分野:

マテリアルサイエンス材料科学
固体化学固体化学
ナノテクノロジーナノテクノロジー

背景:

階層的な固体は,制御された組み立てを通じてユニークな性質を提供します.
分子クラスターは,高度な材料のための調整可能な構成要素を提供します.
コバルトカルコゲン化物と鉄酸化物は,電子および磁気アプリケーションに有望である.

研究の目的:

コバルトカルコゲン化物と酸化鉄の分子群のバイナリアセンブリから階層的な固体を構築する.
これらの新しい結晶材料の構造的特徴と形成機構を調査する.
超原子の構成要素として分子クラスターを使用する可能性を調査する.

主な方法:

6つの異なる分子クラスタの合成:八面体Co6E8 (E = SeまたはTe) と拡張キューバ Fe8O4 ユニット.
電子を寄与するクラスターと,電子を受容するクラスターの間の電荷移転によって引き起こされる二重イオン化合物の結晶化.
原子と超原子の解像度のための単結晶X線微分を用いた構造分析.

主要な成果:

分子クラスターのバイナリ・アセンブリによる階層的な固体の形成に成功した.
2つの異なる上部構造物の識別:CsCl型の相対的および二重六角形の密集した配置.
超構造体内の様々なクラスター組成と方向性の実証.
原子と超原子の解像度を達成し,詳細な構造的な洞察を明らかにしました.

結論:

階層的な固体は,分子クラスターから制御的に組み立てられる.
電荷移転メカニズムは,バイナリイオン結晶化合物の形成を促進します.
報告された超構造は,分子構成要素を持つ結晶工学の新しいパラダイムを提供します.