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Theory of Metallic Conduction01:17

Theory of Metallic Conduction

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The conduction of free electrons inside a conductor is best described by quantum mechanics. However, a classical model makes predictions close to the results of quantum mechanics. It is called the theory of metallic conduction.
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In ordinary chemical reactions, the nucleus — which contains the protons and neutrons of each atom and thus identifies the element — remains unchanged. Electrons, however, can be added to atoms by transfer from other atoms, lost by transfer to other atoms, or shared with other atoms. The transfer and sharing of electrons among atoms govern the chemistry of the elements. During the formation of some compounds, atoms gain or lose electrons to form electrically charged particles called...
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The Earth is a good conductor of electricity, and it is so big that it can be considered an infinite source or sink of charges. It can easily exchange charges with any matter.
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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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For a conductor in which all charges are at rest, the conductor's surface is equipotential. The electric field is always perpendicular to equipotential surfaces. Therefore, in a conductor with static charges, the electric field just outside the conductor is always perpendicular to the conductor's surface. Any tangential component of the electric field will cause charges to move inside the conductor, which will violate the electrostatic nature of the system. In an electrostatic...
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Updated: May 27, 2025

Fabrication of Spatially Confined Complex Oxides
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通过多层次拓学习发现超离子离子导体.

Dong Chen1,2, Bingxu Wang1, Shunning Li1

  • 1School of Advanced Materials, Peking University, Shenzhen Graduate School, Shenzhen 518055, China.

Research square
|February 20, 2025
PubMed
概括
此摘要是机器生成的。

研究人员开发了一种多尺度拓学习框架,以加快用于先进固态电池的超离子导体 (LSIC) 的发现. 这种方法有效地识别出有前途的新材料,其中四种经过实验验证.

关键词:
代数拓学是一种代数拓学.离子导电性 离子导电性持久的同质性 持久的同质性固态电池是一种固态电池.没有监督的学习学习.

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相关实验视频

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科学领域:

  • 材料科学 材料科学 材料科学
  • 计算化学计算化学
  • 固态物理 固态物理

背景情况:

  • 超离子导体 (LSIC) 对于下一代固态电池至关重要,有望实现高离子导电性和安全性.
  • 发现新的LSIC受到巨大的化学空间,有限的数据和复杂的离子传输结构-属性关系的阻碍.
  • 现有的方法很难有效地应对LSIC材料设计的复杂性.

研究的目的:

  • 为高效的LSIC发现引入一种新的多尺度拓学习 (MTL) 框架.
  • 通过整合代数拓和无监督学习来克服识别LSIC的挑战.
  • 开发一种可扩展的工具,以加速能源储存中的材料发现.

主要方法:

  • 开发了一个MTL框架,模拟只有和没有的基层结构,以提取拓特征.
  • 引入了结构连接和离子扩散的拓选度 (循环密度,最小连接距离).
  • 采用无监督的聚类来确定候选物质,并使用ab initio分子动力学来验证.

主要成果:

  • 在MTL框架中,成功地确定了14个超离子导体候选.
  • 发现的四个LSIC被通过实验测试独立验证.
  • 该框架显示了LSIC发现管道的显著加速.

结论:

  • 多尺度拓学习框架为发现新型LSIC提供了一种高效和可扩展的方法.
  • 这项研究验证了将拓数据分析与材料科学机器学习相结合的力量.
  • 开发的方法为推进固态电池技术提供了一个有前途的途径.