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Ferromagnetism01:31

Ferromagnetism

3.3K
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...
3.3K
Colors and Magnetism03:02

Colors and Magnetism

14.4K
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...
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Types Of Superconductors01:28

Types Of Superconductors

1.7K
A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
1.7K
Diamagnetism01:26

Diamagnetism

3.1K
Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
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2D 導電性鉄キノイド磁石 ヘテロゲノス・レドックス・ケミストリーによるTc = 105 Kまでのオーダー

Jordan A DeGayner1, Ie-Rang Jeon1, Lei Sun2

  • 1Department of Chemistry, Northwestern University , Evanston, Illinois 60208-3313, United States.

Journal of the American Chemical Society
|February 24, 2017
PubMed
まとめ

磁気配列と電気伝導性を強化した 鉄キノイド金属有機フレームワーク (MOF) を開発しました 酸化したMOFを減少させることで,磁気調節温度を105Kに大幅に上昇させ,高度な電子アプリケーションの可能性を明らかにした.

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科学分野:

  • 材料科学
  • 固体化学
  • マグネティズム

背景:

  • メタル・オーガニック・フレームワーク (MOF) は,高度なアプリケーションのために調節可能な性質を提供します.
  • アイアンキノイドMOFは,磁気および導電性を持つ可能性のある材料のクラスです.
  • レドックス状態,構造,および性質の関係を理解することは,MOF設計にとって極めて重要です.

研究 の 目的:

  • 鉄キノイドMOFのリドックスペアの磁気および電気的性質を調査する.
  • 1電子の減少が磁気配列温度と電気伝導性に与える影響を調べる.
  • 高磁性オーダーと電気伝導性を要求するアプリケーションのための金属キノイドMOFの可能性を実証する.

主な方法:

  • 酸化および還元された鉄キノイドMOFの合成と特徴付け.
  • 磁気感受性および磁気化測定は,磁気順序温度とヒステリシスを決定する.
  • 電気伝導性の測定は4つの探査法を用いて行われます.
  • 構造と電子分析のための単一結晶X線微分とスペクトロスコピー技術 (例えば,Mössbauerスペクトロスコピー).

主要な成果:

  • 酸化したMOFは1.4~7×10−2S/cmまでの電気伝導性を示す.
  • MOFの1電子還元により,trianionicフレームワーク [Fe3+2(L3−•) ]3−が生成される.
  • 減少したMOFは,T<0xE2><0x82><0x9C>=105K以下で,MOFで報告された最高値の1つである,有意に強化された磁気順序を示す.
  • 減少したMOFは,磁気ヒステリシス100Kまで,電気伝導度は5.1~3) ×10−4S/cmまでを示しています.

結論:

  • 金属キノイドMOFは,磁気配列温度を高めるために化学的に減少させることができます.
  • 減少したMOFの強化された結合は,オーガニック・ラジカル相互作用の増加に起因する.
  • これらの材料は,高磁気配列温度と電気伝導性のユニークな組み合わせを示しています.
  • 鉄キノイドMOFは,高度な機能材料を開発するための有望なプラットフォームです.