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Insight into the Structure Evolution and Performance Optimization of Bi0.5Na0.5TiO3-Based Ceramics for Energy Storage

Qian Wang1,2, Lin Zhang1,2, Rui Li1,2

  • 1School of Physics and Mechanical & Electronical Engineering, Institute for Functional Materials, Hubei University of Education, Wuhan 430205, China.

Materials (Basel, Switzerland)
|May 7, 2025
PubMed
Summary
This summary is machine-generated.

Doping bismuth sodium titanate (BNT) ceramics with strontium magnesium niobate improved energy storage by altering domain structure. The optimized composition achieved a 1.64 J/cm³ discharged energy density, significantly enhancing capacitor performance.

Keywords:
PNRsdomain structureenergy storageion dopingremnant polarization

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Area of Science:

  • Materials Science
  • Solid State Chemistry
  • Energy Storage

Background:

  • Bismuth sodium titanate (BNT) exhibits excellent temperature stability and high saturation polarization, making it suitable for energy storage capacitors.
  • However, BNT's low breakdown strength, high remnant polarization, and complex sintering hinder its application.
  • Ion doping is a strategy to overcome these limitations and enhance energy storage capabilities.

Purpose of the Study:

  • To investigate the effect of Sr(Mg1/3Nb2/3)O3 doping on the structure and energy storage properties of Bi0.5Na0.5TiO3 (BNT) ceramics.
  • To optimize the dopant concentration for improved energy density and reduced energy loss.
  • To understand the relationship between microstructure, domain evolution, and energy storage performance.

Main Methods:

  • Fabrication of (1 - x)Bi0.5Na0.5TiO3-xSr(Mg1/3Nb2/3)O3 ceramics using ion doping.
  • Characterization of structural and microstructural changes using XRD and Raman spectroscopy.
  • Evaluation of energy storage performance, including discharged energy density and polarization-electric field (P-E) loops.

Main Results:

  • Doping induced a transition from long-range-ordered ferroelectric micro-domains to short-range-ordered polar nanoregions (PNRs).
  • This structural evolution led to a diffuse phase transition and a significant reduction in remnant polarization, though saturation polarization also decreased.
  • The optimal composition (x = 0.10) showed a dense microstructure with reduced grain size, achieving a discharged energy density of 1.64 J/cm³ at 150 kV/cm.

Conclusions:

  • Doping with Sr(Mg1/3Nb2/3)O3 effectively modifies the domain structure and microstructure of BNT ceramics.
  • The optimized doping concentration enhances energy storage performance by reducing remnant polarization and improving breakdown strength.
  • These modified BNT ceramics represent a promising advancement for high-performance energy storage capacitors.