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関連する概念動画

Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
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,...
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...
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...
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...
The Seven Crystal Systems: Overview01:24

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 requirements are not imposed on the...

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関連する実験動画

Updated: Jul 12, 2026

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

Published on: June 7, 2018

六角形のフェライトの結晶学.

J A Kohn, D W Eckart, C F Cook

    Science (New York, N.Y.)
    |May 7, 1971
    PubMed
    まとめ

    高解像度電子顕微鏡は,積み重ねられた構成ブロックを視覚化することによって,複雑な六角形のフェライト結晶構造をユニークな方法で解きます. この方法は,大型単元細胞の伝統的な微分に直接的な代替案を提供します.

    科学分野:

    • マテリアルサイエンス 材料科学
    • クリスタログラフィーです.
    • 固体化学 固体化学

    背景:

    • 六角フェライトは複雑な鉄磁性酸化物で,様々な結晶構造を持ち,一部は細胞単位サイズで既知の無機物質を上回る.
    • これらの構造は,結晶学的なc軸に沿って2つの異なる構成要素を順序よく積み重ねることで生じ,混合層のシステムを形成します.

    研究 の 目的:

    • 六角形のフェライトの3次元結晶構造を決定するための新しい方法を開発し,適用する.
    • 伝統的な difrraction-based 構造決定における大きな単位細胞によって引き起こされる課題を克服するために.

    主な方法:

    • 高解像度レプリカ電子顕微鏡を用いて,選択的エッチング後に積み重ねられたブロックの配列を直接視覚化します.
    • スタッキング順序を推論するために,表面エッチ機能を使用し,これは構造決定のための重要な欠けている情報です.

    主要な成果:

    • 直接電子顕微鏡で大きな六角形c次元 (1455と1577アングストーム) の六角形フェライトの結晶構造を解明しました.
    • 混合層構造のブロックの異なるエッチング速度が,積み重ねのシーケンスを視覚化することを可能にすることを実証しました.

    結論:

    さらに関連する動画

    Stable Aqueous Suspensions of Manganese Ferrite Clusters with Tunable Nanoscale Dimension and Composition
    10:45

    Stable Aqueous Suspensions of Manganese Ferrite Clusters with Tunable Nanoscale Dimension and Composition

    Published on: February 5, 2022

    Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
    09:06

    Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

    Published on: March 24, 2019

    関連する実験動画

    Last Updated: Jul 12, 2026

    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

    Published on: June 7, 2018

    Stable Aqueous Suspensions of Manganese Ferrite Clusters with Tunable Nanoscale Dimension and Composition
    10:45

    Stable Aqueous Suspensions of Manganese Ferrite Clusters with Tunable Nanoscale Dimension and Composition

    Published on: February 5, 2022

    Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
    09:06

    Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

    Published on: March 24, 2019

  • 高解像度レプリカ電子顕微鏡は,複雑な結晶構造,特に六角フェライトのような混合層系に対する直接的かつユニークな解決策を提供します.
  • このテクニックは,大型単細胞の材料に対する古典的な difraktion 方法の有望な代替案を提供します.
  • 複製解像度のさらなる改善により,この方法が原子間距離に近づくまで拡張され,固体材料研究における適用範囲が広がる可能性があります.