Jove
Visualize
お問い合わせ
JoVE
x logofacebook logolinkedin logoyoutube logo
JoVEについて
概要リーダーシップブログJoVEヘルプセンター
著者向け
出版プロセス編集委員会範囲と方針査読よくある質問投稿
図書館員向け
推薦の声購読アクセスリソース図書館諮問委員会よくある質問
研究
JoVE JournalMethods CollectionsJoVE Encyclopedia of Experimentsアーカイブ
教育
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab Manual教員リソースセンター教員サイト
利用規約
プライバシーポリシー
ポリシー

関連する概念動画

Metallic Solids02:37

Metallic Solids

18.2K
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....
18.2K
Network Covalent Solids02:18

Network Covalent Solids

13.3K
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...
13.3K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

26.1K
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...
26.1K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

41.4K
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,...
41.4K
Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

9.5K
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...
9.5K
Conformations of Cyclohexane02:11

Conformations of Cyclohexane

12.1K
Cyclohexane does not exist in a planar form due to the high angle and torsional strain it would experience in the planar structure. Instead, it adopts non-planar chair and boat conformations.
The chair form is the most stable and derives its name from its resemblance to the “easy chair.” In the chair conformation, two carbon atoms are arranged out-of-plane — one above and one below, minimizing the torsional strain. In the chair form, the bond angle is very close to the ideal...
12.1K

こちらも読む

関連記事

共著者、ジャーナル、引用グラフによってこの研究に関連する記事。

並び替え
Same author

Reconfigurable Two-Dimensional Activation Neuron Device.

Nano letters·2026
Same author

Programmable Anomalous Photovoltaics Enabled by Light-Electric Dual-Field Control.

Journal of the American Chemical Society·2026
Same author

Multi-State Memory in 2D Magnets via Thickness-Engineered Growth.

Advanced materials (Deerfield Beach, Fla.)·2026
Same author

Realization of room-temperature magnetism and multistep magnetization switching in 2D metallic ferrimagnets.

Science advances·2026
Same author

Deformation-Assisted Skyrmion Formation and Reorganization under Pulsed Currents.

ACS nano·2026
Same author

Sodiophilic Hosts With Pseudocapacitive Kinetics for Robust Anode-Free Sodium Metal Batteries.

Angewandte Chemie (International ed. in English)·2026

関連する実験動画

Updated: Jun 3, 2025

Characterization of Ultra-fine Grained and Nanocrystalline Materials Using Transmission Kikuchi Diffraction
09:13

Characterization of Ultra-fine Grained and Nanocrystalline Materials Using Transmission Kikuchi Diffraction

Published on: April 1, 2017

13.6K

六角形ダイヤモンド形成の鍵:理論的および実験的研究

Sheng-Cai Zhu1, Gu-Wen Chen1, Xiao-Hong Yuan2

  • 1School of Materials, Shenzhen Campus of Sun Yat-sen University, Shenzhen 518107, China.

Journal of the American Chemical Society
|January 6, 2025
PubMed
まとめ

科学者は特定の圧力と温度条件下で グラファイトの変換をシミュレートすることで 六角形のダイヤモンド (HD) を合成しました この突破は 形成メカニズムを明らかにし この超硬質物質の 将来の合成を導きます

さらに関連する動画

An Externally-Heated Diamond Anvil Cell for Synthesis and Single-Crystal Elasticity Determination of Ice-VII at High Pressure-Temperature Conditions
07:48

An Externally-Heated Diamond Anvil Cell for Synthesis and Single-Crystal Elasticity Determination of Ice-VII at High Pressure-Temperature Conditions

Published on: June 18, 2020

6.7K
Synthesis and Microdiffraction at Extreme Pressures and Temperatures
07:26

Synthesis and Microdiffraction at Extreme Pressures and Temperatures

Published on: October 7, 2013

11.2K

関連する実験動画

Last Updated: Jun 3, 2025

Characterization of Ultra-fine Grained and Nanocrystalline Materials Using Transmission Kikuchi Diffraction
09:13

Characterization of Ultra-fine Grained and Nanocrystalline Materials Using Transmission Kikuchi Diffraction

Published on: April 1, 2017

13.6K
An Externally-Heated Diamond Anvil Cell for Synthesis and Single-Crystal Elasticity Determination of Ice-VII at High Pressure-Temperature Conditions
07:48

An Externally-Heated Diamond Anvil Cell for Synthesis and Single-Crystal Elasticity Determination of Ice-VII at High Pressure-Temperature Conditions

Published on: June 18, 2020

6.7K
Synthesis and Microdiffraction at Extreme Pressures and Temperatures
07:26

Synthesis and Microdiffraction at Extreme Pressures and Temperatures

Published on: October 7, 2013

11.2K

科学分野:

  • 材料科学
  • 凝縮物質物理学
  • クリスタルグラフィー

背景:

  • 硬さで知られる六角形のダイヤモンドは,高圧・高温条件下でのみ合成することが困難である.
  • グラファイトからダイヤモンドの形成メカニズムの理解は HDの成功合成に不可欠です

研究 の 目的:

  • 石墨から六角形のダイヤモンド (HD) の形成メカニズムを解明する.
  • 純粋なHDと立方ダイヤモンド (CD) の合成に必要な特定の条件を特定する.
  • HDの新合成戦略を導き出すこと

主な方法:

  • グラファイトからHDへの移行を観察するための系統的な分子動力学シミュレーション.
  • 制御された高圧高温 (HPHT) 実験でシミュレーション結果を検証する.

主要な成果:

  • グラファイトからHDへの移行の核形成成長機構の直接観察.
  • グラファイト [001] 方向に沿った高圧力と穏やかな温度下でのHD形成が好ましい.
  • グラファイトのAB層の積み重ねが破壊されたり,より高い温度で自由に滑ったりすると,立方体ダイヤモンド (CD) の形成が好まれる.

結論:

  • グラファイトからダイヤモンドへの移行を制御する圧力-温度制御メカニズムを明確にしました.
  • 理論的予測を検証する準非軸性条件下でのHDの成功合成を証明した.
  • グラファイトの基礎平面の積み重ねと層の滑り方を制御することによって,HD合成のための新しいアプローチを提案しました.