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相关概念视频

MOS Capacitor01:25

MOS Capacitor

711
A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
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Dielectric Polarization in a Capacitor01:31

Dielectric Polarization in a Capacitor

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The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
4.6K
Capacitor With A Dielectric01:18

Capacitor With A Dielectric

3.9K
Parallel plate capacitors consist of two conducting plates separated by a certain distance. However, it is mechanically difficult to hold the large plates parallel to each other without actual contact. Hence, a dielectric layer is commonly placed between the plates, which provides an easy solution for holding the plates together with a small gap and increases the capacitance of the capacitor.
Dielectrics are non-conducting materials with no free or loosely bound electrons. When a dielectric is...
3.9K
Spherical and Cylindrical Capacitor01:26

Spherical and Cylindrical Capacitor

5.5K
A spherical capacitor consists of two concentric conducting spherical shells of radii R1 (inner shell) and R2 (outer shell). The shells have  equal and opposite charges of +Q and −Q, respectively. For an isolated conducting spherical capacitor, the radius of the outer shell can be considered to be infinite.
Conventionally, considering the  symmetry, the electric field between the concentric shells of a spherical capacitor is directed radially outward. The magnitude of the field,...
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Capacitors01:15

Capacitors

416
Capacitors play a crucial role in car radios, where they filter and store frequencies to ensure clear signal reception. Essentially serving as energy storage devices, capacitors store energy within their electric field and are composed of two parallel conducting plates separated by a dielectric.
When a voltage source is connected to a capacitor, positive and negative charges accumulate on the opposite plates. This accumulation generates a potential difference that equals the product of the...
416

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Updated: Jun 9, 2025

Application of a Coupling Agent to Improve the Dielectric Properties of Polymer-Based Nanocomposites
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一个具有局部多态异构结构的广泛高温陶电容器.

Binglong Zheng1, Ying Lin1, Haibo Yang1

  • 1Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, School of Materials Science and Engineering, Shaanxi University of Science and Technology, Xi'an, 710021, China.

Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|October 30, 2024
PubMed
概括
此摘要是机器生成的。

这项研究引入了用于脉冲电容器的新型无陶,实现了高能量密度和效率. 这些材料表现出极好的性能,即使在高温下,提供持久的储能解决方案.

关键词:
陶电容器 陶电容器的使用方法高温储能储能系统是高温储能系统.没有的无材料.多态异构结构的多态异构结构.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 储能 储能 储能 储能 储能 储能
  • 陶制品 在陶方面.

背景情况:

  • 脉冲电容器需要高性能介电材料.
  • 现有材料在满足不断升级的实际应用需求方面面临挑战.
  • 寻求无陶,以提高安全性和环境状况.

研究的目的:

  • 开发具有增强能量储存性能的新型无陶.
  • 研究局部多态异质结构对介电性能的影响.
  • 为了实现高可回收能源密度和实际应用的效率.

主要方法:

  • 无陶的合成,其配方是 (1-x) [0.92BaTiO3-0.08Sr(Mg1/2Ti3/4) O3]-x(Na0.5Bi0.5) TiO3 (BT-SMT-xNBT). 这是一种无陶的合成方法.
  • 利用从原子到谷物规模的多层次协同战略.
  • 使用偏差校正传输电子显微镜进行表征,以验证多态异构结构.

主要成果:

  • 实现了巨大的可回收能量密度 (Wrec) 10.1 J·cm−3 和95.0%的能效 (η).
  • 经过证明的高温储能 (7.2 J·cm−3 Wrec,在150°C时92.2% η) 具有广泛的温度稳定性.
  • 观察到四面体和四面体纳米领域的共存,证实了多态异构结构.

结论:

  • 新型BT-SMT-xNBT陶为高性能,持久的储能介电材料提供了一个有希望的解决方案.
  • 集成SMT和NBT组件有效地提高了能量密度,效率和断裂强度.
  • 这些材料具有出色的热稳定性,对于苛刻的实际应用至关重要.