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相关概念视频

Network Covalent Solids02:18

Network Covalent Solids

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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...
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Electric Field at the Surface of a Conductor01:26

Electric Field at the Surface of a Conductor

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Consider a conductor in electrostatic equilibrium. The net electric field inside a conductor vanishes, and extra charges on the conductor reside on its outer surface, regardless of where they originate.
In the 19th century, Michael Faraday conducted the famous ice pail experiment to prove that the charges always reside on the surface of a conductor. The experimental set-up consists of a conducting uncharged container mounted on an insulating stand. The outer surface of the container is...
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Superconductor01:24

Superconductor

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A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
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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...
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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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相关实验视频

Updated: May 5, 2026

Ohmic Contact Fabrication Using a Focused-ion Beam Technique and Electrical Characterization for Layer Semiconductor Nanostructures
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在二维CO2层中的超导性.

Kazunori Takada1, Hiroya Sakurai, Eiji Takayama-Muromachi

  • 1Advanced Materials Laboratory, National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan. takada.kazunori@nims.go.jp

Nature
|March 7, 2003
PubMed
概括
此摘要是机器生成的。

研究人员发现了一种新的分层氧化物Na(x) CoO2*yH2O的超导性. 这一发现挑战了长期以来的信念,即氧化铜层对于高过渡温度 (高Tc) 超导性至关重要.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 凝聚物质物理学 凝聚物质物理学
  • 固态化学 固态化学

背景情况:

  • 在层状铜氧化物中发现高过渡温度 (高Tc) 超导性,促使对其他层状金属氧化物中类似现象进行了广泛的研究.
  • 之前对3D过渡金属氧化物的研究,包括和,没有产生超导性,这导致了铜氧化物层是不可或缺的假设.

研究的目的:

  • 为了研究超导电的潜力在层层的金属氧化物超出铜基化合物.
  • 为了探索聚酸盐水合物 (Na(x) CoO2*yH2O) 的超导特性.

主要方法:

  • 合成和表征Na(x) CoO2*yH2O,具有特定的固体几何学 (x ≈ 0.35, y ≈ 1.3).
  • 使用适当的实验技术测量超导过渡温度 (T(c)).

主要成果:

  • Na(x) CoO2*yH2O被确定为一种超导体,T(c) 约为5K.
  • 该化合物具有二维CoO2层,由Na+离子和H2O分子的绝缘层分开.
  • 超导性能与高T (c) 铜氧化物具有很强的相似性.

结论:

  • 在Na(x) CoO2*yH2O中发现超导性表明,超导性可以发生在分层的氧化物中.
  • 在超导特性中观察到的相似性表明酸盐和酸盐超导体之间存在类似的基础物理.
  • 这一发现扩大了具有超导性的材料的范围,并为非传统超导性的研究开辟了新的途径.