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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...
Network Covalent Solids02:18

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...
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...
Imperfections in Crystal Structure: Point, Line and Plane Defects01:25

Imperfections in Crystal Structure: Point, Line and Plane Defects

A perfect crystal, in theory, has a uniform structure with the same unit cell and lattice points throughout. However, any deviation from this periodic arrangement is known as an imperfection or defect. These defects can be categorized into three types: point, line, and plane defects.Point defects occur when there is a deviation from the ideal due to missing atoms, displaced atoms, or additional atoms. These imperfections might occur due to imperfect packing during crystallization or because of...
Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...
Imperfections in Crystal Structure: Non-Stoichiometric Defects01:29

Imperfections in Crystal Structure: Non-Stoichiometric Defects

Non-stoichiometric defects refer to a type of defect in the crystal structure of a compound where the ratio of its constituent elements deviates from the ideal stoichiometric ratio. There are two main types of non-stoichiometric defects: metal excess defects and metal deficiency defects.Metal excess defects occur when there is a slight surplus of metal ions than what is required by the stoichiometric ratio of the compound. For example, heating a sodium chloride crystal in sodium vapor results...

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Updated: Jun 25, 2026

Spark Plasma Sintering Apparatus Used for the Formation of Strontium Titanate Bicrystals
11:17

Spark Plasma Sintering Apparatus Used for the Formation of Strontium Titanate Bicrystals

Published on: February 9, 2017

グラファイトの多面体結晶

Y Gogotsi1, J A Libera, N Kalashnikov

  • 1University of Illinois at Chicago, Department of Mechanical Engineering, Chicago, IL 60607, USA. gogotsi@drexel.edu

Science (New York, N.Y.)
|October 13, 2000
PubMed
まとめ
この要約は機械生成です。

ガラスのような炭素で発見された新しいグラファイト多面結晶 (GPC) は,ユニークな対称性と高い完璧さを示しています. これらのナノ構造は,その優れた特性により,高度な材料の応用の可能性を示しています.

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Synchrotron X-ray Microdiffraction and Fluorescence Imaging of Mineral and Rock Samples
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Synchrotron X-ray Microdiffraction and Fluorescence Imaging of Mineral and Rock Samples

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Multimodal 3D Printing of Phantoms to Simulate Biological Tissue
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Multimodal 3D Printing of Phantoms to Simulate Biological Tissue

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関連する実験動画

Last Updated: Jun 25, 2026

Spark Plasma Sintering Apparatus Used for the Formation of Strontium Titanate Bicrystals
11:17

Spark Plasma Sintering Apparatus Used for the Formation of Strontium Titanate Bicrystals

Published on: February 9, 2017

Synchrotron X-ray Microdiffraction and Fluorescence Imaging of Mineral and Rock Samples
10:12

Synchrotron X-ray Microdiffraction and Fluorescence Imaging of Mineral and Rock Samples

Published on: June 19, 2018

Multimodal 3D Printing of Phantoms to Simulate Biological Tissue
05:11

Multimodal 3D Printing of Phantoms to Simulate Biological Tissue

Published on: January 11, 2020

科学分野:

  • マテリアルサイエンス 材料科学
  • ナノテクノロジー ナノテクノロジー
  • 炭素科学とは,炭素科学である.

背景:

  • ガラスのような炭素の毛穴内の新しい多面体ナノおよびマイクロ構造の発見.
  • これらの構造は,グラファイト多面結晶 (GPC) と呼ばれ,ナノチューブコアとグラファイト面を持つ.
  • 観察されたGPCは,7倍と9倍を含む異常な軸対称性を示す.

研究 の 目的:

  • 新しく発見されたグラファイト多面結晶 (GPC) の形態と構造を特徴づける.
  • 既存の多壁ナノチューブとGPCの完璧さを比較する.
  • GPCの潜在的な性質と応用を調査する.

主な方法:

  • 構造分析のためのラーマン光譜法.
  • 高解像度イメージングのための伝送電子顕微鏡 (TEM).
  • ガラスのような炭素の孔に含まれるGPCの形態学的特徴.

主要な成果:

  • グラファイトの多面体結晶 (GPC) は,様々な形状 (針,棒,リングなど) を有しています. 特定されました.
  • GPCは,比較可能なサイズの多壁ナノチューブよりも高いレベルの構造的完璧さを示しています.
  • 結晶の横断面は最大1マイクロメートル,長さは最大5マイクロメートルで,さらに大きく成長する可能性があります.

結論:

  • グラファイト多面体結晶 (GPCs) は,炭素ナノ構造の新しいクラスを表しています.
  • その高い完璧さとユニークな対称性は,高度な材料特性を示唆しています.
  • 予備的な調査結果は,GPCの高い電気伝導性,強度,化学的安定性を示しています.