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関連する概念動画

Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis. This...
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
Ferromagnetism01:31

Ferromagnetism

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...
Potential Due to a Magnetized Object01:24

Potential Due to a Magnetized Object

Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
The vector...
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved in...

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Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
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Published on: June 9, 2023

EuNbO2NNにおける大きな結合磁気反応

A Belén Jorge1, Judith Oró-Solé, Ana M Bea

  • 1Institut de Ciència de Materials de Barcelona (C.S.I.C.), Campus U.A.B., 08193 Bellaterra, Spain.

Journal of the American Chemical Society
|September 2, 2008
PubMed
まとめ

研究者は,磁場に強く反応する材料を見つけるために,新しいペロブスキート,EuMO2Nを合成しました. EuNbO2Nは巨大な磁気抵抗と巨大な磁気容量を示していますが,後者は微細構造的に駆動されています.

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Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
06:53

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科学分野:

  • マテリアルサイエンス 材料科学
  • 凝縮物質物理学 凝縮物質物理学
  • 固体化学 固体化学

背景:

  • 磁場に対する有意な反応を持つ材料を発見することは,高度な電子アプリケーションにとって極めて重要です.
  • ペロブスキート構造は,電子および磁気特性を調節するための汎用的なプラットフォームを提供します.
  • 磁気秩序と構造的歪みとの相互作用は,ユニークな磁気電気現象につながる可能性があります.

研究 の 目的:

  • 磁場に対する大きな抵抗性または容量性の反応を持つ材料を発見するための新しい戦略を探求する.
  • 新型ユーロピウム-モリブデン-オキシニトリド (EuMO2N) のペロブスキート合成および特徴づけ.
  • これらの新しい材料の磁気および磁気電気的性質を調査する.

主な方法:

  • EuMO2N (M = Nb, Ta) ペロブスキットの合成.
  • Eu2+スピンの鉄磁気順序の特徴.
  • M5+カチオンの潜在的なオフセンター歪みの調査.
  • 低温で異なる磁場下での電気抵抗と電容量の測定.

主要な成果:

  • EuNbO2Nペロフスキートが合成され,鉄磁気秩序を示した.
  • EuNbO2Nは低温で巨大な磁気抵抗を示した.
  • EuNbO2Nで巨大な磁気容量効果が観察されました.
  • マグネト容量は,固有のマルチフェロイズムではなく,微細構造的な効果に起因した.

結論:

  • EuMO2Nペロブスキットは,磁場反応の探査のための有望な材料のクラスです.
  • EuNbO2Nは巨大な磁気抵抗性を示し,磁気感知の可能性を強調しています.
  • 観測されたEuNbO2Nの巨大な磁気容量は,微細構造と関連しており,内在的な効果についてさらなる研究が必要である.