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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.
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A Broad-High Temperature Ceramic Capacitor with Local Polymorphic Heterogeneous Structures.

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
Summary
This summary is machine-generated.

This study introduces novel lead-free ceramics for pulsed power capacitors, achieving high energy density and efficiency. These materials show excellent performance, even at high temperatures, offering durable energy storage solutions.

Keywords:
ceramic capacitorshigh‐temperature energy storagelead‐freepolymorphic heterogeneous structure

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Area of Science:

  • Materials Science
  • Energy Storage
  • Ceramics

Background:

  • Pulsed power capacitors require high-performance dielectrics.
  • Existing materials face challenges in meeting escalating practical application demands.
  • Lead-free ceramics are sought for improved safety and environmental profiles.

Purpose of the Study:

  • To develop novel lead-free ceramics with enhanced energy storage properties.
  • To investigate the effect of local polymorphic heterogeneous structures on dielectric performance.
  • To achieve high recoverable energy density and efficiency for practical applications.

Main Methods:

  • Synthesis of lead-free ceramics with the formula (1-x)[0.92BaTiO3-0.08Sr(Mg1/2Ti3/4)O3]-x(Na0.5Bi0.5)TiO3 (BT-SMT-xNBT).
  • Utilizing a multi-scale synergistic strategy from atomic to grain scale.
  • Characterization using aberration-corrected transmission electron microscopy to validate polymorphic heterostructures.

Main Results:

  • Achieved a giant recoverable energy density (Wrec) of 10.1 J·cm⁻³ and energy efficiency (η) of 95.0%.
  • Demonstrated high-temperature energy storage (7.2 J·cm⁻³ Wrec, 92.2% η at 150 °C) with broad-temperature stability.
  • Observed coexistence of tetragonal and rhombohedral nanodomains, confirming polymorphic heterostructures.

Conclusions:

  • The novel BT-SMT-xNBT ceramics offer a promising solution for high-performance, durable energy storage dielectrics.
  • The integration of SMT and NBT components effectively enhances energy density, efficiency, and breakdown strength.
  • The materials exhibit excellent thermal stability, crucial for demanding practical applications.