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関連する概念動画

Phase Transitions: Sublimation and Deposition02:33

Phase Transitions: Sublimation and Deposition

16.0K
Some solids can transition directly into the gaseous state, bypassing the liquid state, via a process known as sublimation. At room temperature and standard pressure, a piece of dry ice (solid CO2) sublimes, appearing to gradually disappear without ever forming any liquid. Snow and ice sublimate at temperatures below the melting point of water, a slow process that may be accelerated by winds and the reduced atmospheric pressures at high altitudes. When solid iodine is warmed, the solid sublimes...
16.0K
Properties of Transition Metals02:58

Properties of Transition Metals

28.2K
Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
28.2K
Valence Bond Theory02:42

Valence Bond Theory

8.9K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
8.9K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

28.4K
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...
28.4K
Colors and Magnetism03:02

Colors and Magnetism

12.1K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
12.1K
Ferromagnetism01:31

Ferromagnetism

2.8K
Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
2.8K

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関連する実験動画

Updated: May 5, 2026

Fabrication of Spatially Confined Complex Oxides
08:45

Fabrication of Spatially Confined Complex Oxides

Published on: July 1, 2013

9.1K

マンガナイトの電子的に柔らかい相.

G C Milward1, M J Calderón, P B Littlewood

  • 1Cavendish Laboratory, Cambridge University, Madingley Road, Cambridge CB3 0HE, UK. gcm24@cam.ac.uk

Nature
|February 11, 2005
PubMed
まとめ
この要約は機械生成です。

マンガナイトの巨大な磁気抵抗は,競合する相から生じる. 新しい研究は,磁気と電荷調節が新しい熱力学的相で共存し,以前のモデルに挑戦できることを示しています.

さらに関連する動画

Elemental-sensitive Detection of the Chemistry in Batteries through Soft X-ray Absorption Spectroscopy and Resonant Inelastic X-ray Scattering
07:55

Elemental-sensitive Detection of the Chemistry in Batteries through Soft X-ray Absorption Spectroscopy and Resonant Inelastic X-ray Scattering

Published on: April 17, 2018

11.8K
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

8.2K

関連する実験動画

Last Updated: May 5, 2026

Fabrication of Spatially Confined Complex Oxides
08:45

Fabrication of Spatially Confined Complex Oxides

Published on: July 1, 2013

9.1K
Elemental-sensitive Detection of the Chemistry in Batteries through Soft X-ray Absorption Spectroscopy and Resonant Inelastic X-ray Scattering
07:55

Elemental-sensitive Detection of the Chemistry in Batteries through Soft X-ray Absorption Spectroscopy and Resonant Inelastic X-ray Scattering

Published on: April 17, 2018

11.8K
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

8.2K

科学分野:

  • 凝縮物質物理学 凝縮物質物理学
  • 材料科学 材料科学とは

背景:

  • マンガナイトの巨大磁気抵抗 (CMR) は,通常,金属の鉄磁気状態と隔離電荷調節状態の相分離に起因する.
  • 磁気および電荷変調順序のパラメータの共存を示す複雑な相は,マンガニット相図で観察されています.

研究 の 目的:

  • マンガニットにおける磁気と電荷変調の共存を現象学的なギンツブルク・ランドー理論を用いて説明する.
  • 拡張された"電荷密度波"現象として電荷変調の再解釈を提案する.

主な方法:

  • 現象学的なギンツブルク・ランドー理論の発展と応用.
  • 段階図と順序パラメータの共存の分析.

主要な成果:

  • ジンツブルク・ランドー理論は,新しい熱力学的相における磁気と電荷変調の共存を成功裏に説明している.
  • このモデルは,実験的観測と一致する均衡相の豊かな図を予測しています.
  • この発見は,マンガニットにおける電荷調節は,電荷密度波としてよりよく説明できると示唆しています.

結論:

  • マンガニットにおける磁気と電荷調節の共存は,単に乱れやストレスのせいではなく,新しい熱力学的均衡の相から生じる.
  • この研究は,これらの材料における電荷変調を,電荷密度波モデルに向けて再評価することを必要としています.
  • 競合する注文の対称性に基づく共存の原則は,他の相関する電子システムにも適用され得る.