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関連する概念動画

Ionic Crystal Structures02:42

Ionic Crystal Structures

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...
Metallic Solids02:37

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 malleability. Many...
Structures of Solids02:22

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...
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
Unit Cells01:18

Unit Cells

A crystal's internal structure is an orderly array of atoms, ions, or molecules, and the details of this array significantly influence the solid's properties. In a crystal, periodically repeating 'structural motifs' - which could be atoms, molecules, or groups thereof - create a 'space lattice.' This is essentially a three-dimensional, infinite array of points, each surrounded by its neighbors in an identical way, forming the basic structure of the crystal.A 'unit cell' is a theoretical...
Predicting Molecular Geometry02:27

Predicting Molecular Geometry

VSEPR Theory for Determination of Electron Pair Geometries

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関連する実験動画

Updated: May 15, 2026

Fabrication and Optimization of Type II Silicon Clathrate Films
06:53

Fabrication and Optimization of Type II Silicon Clathrate Films

Published on: October 14, 2025

タイプIIの構造を持つチンのクラトラート.

Marion C Schäfer1, Svilen Bobev

  • 1Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States.

Journal of the American Chemical Society
|January 19, 2013
PubMed
まとめ

研究者は,タイプIIの構造を持つ新しい亜鉛クラスラートを合成し,これらの化合物の既知のファミリーを拡大しました. これらの新しい材料は,アルカリとアルカリ土金属を使用して,構造内の特定のケージを埋めるために作成されました.

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
  • 無機化学 無機化学とは

背景:

  • タイプIIクラトラートは,熱電性材料の潜在的応用を持つケージ状の構造です.
  • タイプIIの構造を持つバリウムガリウムチン (Ba-Ga-Sn) クラスラートは,以前は1つの既知の組成に限定されていました.

研究 の 目的:

  • タイプIIのBa-Ga-Snクラトラートファミリーの新しいメンバーを合成し,特徴づけること.
  • これらの構造の安定化におけるアルカリおよびアルカリ土金属の役割を調査する.

主な方法:

  • 高温固体合成. 高温固体合成.
  • 構造的決定のための単結晶X線 difraktion.
  • 構成を確認するための元素分析.

主要な成果:

  • 3つの新しいタイプIIクラトラートの発見と合成:Cs(8) Ba(16) Ga(39.7(3)) Sn(96.3(3)),Rb(9.9(5)) Ba(13.3(2)) Ga(36.4(3)) Sn(99.6(3)),およびK(2.0(4)) Ba(14.04)) Ga(30.4(2)) Sn(105.6(4)).
  • アルカリおよびアルカリ土金属が,II型クラトラートのケージに組み込まれることの実証.
  • 新しい化合物の詳細な構造的特徴.

さらに関連する動画

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
06:35

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

Published on: February 15, 2016

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
06:44

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding

Published on: March 24, 2018

関連する実験動画

Last Updated: May 15, 2026

Fabrication and Optimization of Type II Silicon Clathrate Films
06:53

Fabrication and Optimization of Type II Silicon Clathrate Films

Published on: October 14, 2025

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
06:35

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

Published on: February 15, 2016

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
06:44

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding

Published on: March 24, 2018

結論:

  • Ba-Ga-Sn II型クラトラート族は,新しいセシウム,ルビジウム,およびカリウムを含むメンバーの発見により,著しく拡大されました.
  • ケージをアルカリやアルカリ土金属で選択的に埋めることは,新しいクラトラート化合物を合成するための実行可能な戦略です.
  • これらの発見は,潜在的に調節可能な特性を持つ新しい材料を探索するための道を開きます.