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相关概念视频

Colors and Magnetism03:02

Colors and Magnetism

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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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Ferromagnetism01:31

Ferromagnetism

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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...
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Valence Bond Theory02:42

Valence Bond Theory

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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...
9.4K
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

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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.
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Diamagnetism01:26

Diamagnetism

2.5K
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....
2.5K
Atomic Nuclei: Nuclear Magnetic Moment00:59

Atomic Nuclei: Nuclear Magnetic Moment

1.4K
All atomic nuclei are positively charged. When they have a nonzero spin, they behave like rotating charges. As a consequence of their charge and spin, these nuclei generate a magnetic field (B). This, in turn, gives rise to a magnetic moment (μ), which is randomly oriented in the absence of an external magnetic field. When an external magnetic field (B0) is applied, the magnetic moment vectors can align with the field or against it in 2 + 1 orientations. A hydrogen nucleus, which is just a...
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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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在无序的NiCr中磁性顺序 (O)

Yulia S Gokhfeld1, Natalia V Kazak1, Anastasia S Tarasova1

  • 1Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 660036 Krasnoyarsk, Russia. yugo@iph.krasn.ru.

Dalton transactions (Cambridge, England : 2003)
|August 19, 2025
PubMed
概括

这项研究引入了NiCr(BO3) O,一种新的无序氧化酸盐,表现出磁性排序. 它显示了45K的磁相过渡和旋转方向过渡,突出显示了其独特的磁性.

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科学领域:

  • 固态化学 固态化学
  • 材料科学 材料科学 材料科学
  • 磁力学 磁力学 是一种

背景情况:

  • 氧化酸盐是一种具有多种结构和物理性质的无机化合物.
  • 了解无序材料中的磁性排序对于开发先进的磁性应用至关重要.
  • 众所周知,华维克石结构是各种磁离子的主机.

研究的目的:

  • 为了合成和表征一种新的氧化,NiCr(BO3) O.O. 的新型氧化.
  • 为了研究这种无序的氧化酸盐的磁性和相位过渡.
  • 确定NiCr(BO3) O作为无序氧化酸盐中磁性排序的第一个例子.

主要方法:

  • 对于NiCr(BO3) O. 的流量方法合成.
  • 用X射线衍射来确定晶体结构 (正方体瓦尔维克石,空间组Pbnm).
  • 磁性易感性 (dc和ac),热容量测量和磁化研究以探测磁性行为.

主要成果:

  • NiCr ((BO3) O 在形瓦尔维克岩结构中结晶,具有显著的 Ni/Cr 障碍.
  • 在T_N = 45K时发生一次性磁相过渡,由磁感应和热容量异常证明.
  • 在10K左右观察到额外的磁异常,反铁磁合占主导地位 (韦斯温度~-130K).
  • 当场垂直于c轴时,在T_N以下观察到场诱导的旋转方向过渡.
  • 有效磁矩大约为每方程式单位4.9μB.
  • 德拜温度被确定为365K.

结论:

  • (NiCr) (BO3) O是第一个在高度混乱的金属现场环境中表现出磁性排序的氧化.
  • 该材料表现出复杂的磁性行为,包括初级反铁磁性排序和场诱导的旋转重定位.
  • 这一发现为探索无序的氧化酸盐系统中的磁现象开辟了新的途径.