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Related Concept Videos

Dielectric Polarization in a Capacitor01:31

Dielectric Polarization in a Capacitor

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...
Potential Due to a Polarized Object01:29

Potential Due to a Polarized Object

A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
MOS Capacitor01:25

MOS Capacitor

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...
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)01:15

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
Susceptibility, Permittivity and Dielectric Constant01:26

Susceptibility, Permittivity and Dielectric Constant

When placed in an external electric field, a dielectric material gets polarized. The charge density in the dielectric material is given by the sum of the bound and free charge densities, while the total charge density can also be written in terms of the total electric field. The bound charge density can be measured in terms of polarization, leading to the relationship between electric displacement and polarization.
Capacitors01:15

Capacitors

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...

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Application of a Coupling Agent to Improve the Dielectric Properties of Polymer-Based Nanocomposites
06:34

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Published on: September 19, 2020

Local Polarization Unit Engineering Enables Ultrahigh Energy Density in NBT-Based High-Entropy Ceramic Capacitors.

Shiyu Zhou1, Yucheng Zhou2, Linhai Li3

  • 1Key Laboratory of Advanced Civil Engineering Materials of the Ministry of Education, Functional Materials Research Laboratory, School of Materials Science and Engineering, Tongji University, Shanghai, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|May 19, 2026
PubMed
Summary
This summary is machine-generated.

Engineered high-entropy multilayer ceramic capacitors (MLCCs) with local polarization units achieve ultrahigh energy storage density. This breakthrough offers enhanced performance for pulsed power systems.

Keywords:
energy storagehigh‐entropylocal polar unitsmultilayer ceramic capacitor

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Energy Storage

Background:

  • Dielectric energy storage capacitors are crucial for pulsed power systems.
  • Developing advanced materials with higher energy density and stability is essential.

Purpose of the Study:

  • To engineer local polarization units in high-entropy multilayer ceramic capacitors (MLCCs) for enhanced dielectric energy storage.
  • To achieve a breakthrough in recoverable energy density and efficiency.

Main Methods:

  • Incorporation of equimolar Ba2+/Sr2+ dual cations into an NBT-based matrix.
  • Stabilization of a nanoscale phase-coexistence state.
  • Atomic-resolution HAADF-STEM and phase-field simulations for validation.

Main Results:

  • Achieved an ultrahigh recoverable energy density of 18.2 J cm-3 with 91% efficiency.
  • Demonstrated exceptional thermal stability and fatigue resistance.
  • Validated the role of local polarization units and disrupted long-range order.

Conclusions:

  • Established a general design paradigm for high-entropy dielectrics for energy storage.
  • Controlled local polarization configurations to enhance dielectric properties.
  • Demonstrated a promising route for advanced energy storage solutions.