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Non-linear Dielectric Materials for Energy Storage Capacitors

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Thin Films and Interfaces".

Deadline for manuscript submissions: closed (10 September 2022) | Viewed by 4248

Special Issue Editors


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Guest Editor
Centre of Physics of University of Minho and Porto (CF-UM-UP), Campus de Gualtar, 4710-057 Braga, Portugal
Interests: novel nanostructured films; oxide semiconductors and metallic nanoparticles; ferroelectric thin films; energy storage capacitors; non-volatile memories
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E-Mail Website
Guest Editor
Centre of Physics of University of Minho and Porto (CF-UM-UP), Campus de Gualtar, 4710-057 Braga, Portugal
Interests: thin films; lead-free perovskite ferroelectrics; (pseudo-)binary oxide thin films; PVD techniques; energy storage; non-volatile memories
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The development of advanced electrical energy storage devices such as batteries, electrochemical capacitors, and dielectric capacitors has been pursued intensely to meet the ever-growing need for on-demand energy supply. Dielectric capacitors offer high-power density and ultrafast discharging times as compared to electrochemical capacitors and batteries, making them potential candidates for pulsed power technologies.

Non-linear dielectrics in the form of ferroelectrics (FE), relaxor ferroelectrics (RFE), and antiferroelectrics (AFE) have spontaneous polarization (Ps) and higher dielectric permittivities (K) than linear dielectric (LD) capacitors, and they can work both as DC and AC devices. Therefore, interest in non-linear dielectrics, either in the bulk or thin film form, is continuously on the rise, both from a fundamental and application point of view.

Advanced non-linear dielectrics such as FE, RFE, and AFE should satisfy multiple characteristics, such as a low coercive field, high maximum polarization, low remnant polarization, large dielectric breakdown field, and slim hysteresis, in order to obtain superior energy storage performance. In addition, they should display higher thermal and mechanical stability.

In this Special Issue, we invite contributions aiming to identify modern trends of non-linear dielectric materials for energy storage capacitors, including the processing fundamentals and optimization of final capacitor properties.

It is our pleasure to invite you to submit a manuscript for this Special Issue. Full papers, communications, and reviews are all welcome.

Prof. Dr. Maria J. M. Gomes
Dr. Jose P. B. Silva
Guest Editors

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Keywords

  • non-linear dielectrics
  • ferroelectrics
  • relaxor ferroelectrics
  • antiferroelectrics
  • thin films
  • ceramics
  • energy storage capacitors

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Published Papers (1 paper)

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Research

12 pages, 4057 KiB  
Article
Enhancement of Nonlinear Dielectric Properties in BiFeO3–BaTiO3 Ceramics by Nb-Doping
by Ziqi Yang, Bing Wang, Yizhe Li and David A. Hall
Materials 2022, 15(8), 2872; https://doi.org/10.3390/ma15082872 - 14 Apr 2022
Cited by 17 | Viewed by 2702
Abstract
BiFeO3–BaTiO3 (BF–BT) ceramics exhibit great potential for diverse applications in high temperature piezoelectric transducers, temperature-stable dielectrics and pulsed-power capacitors. Further optimization of functional properties for different types of applications can be achieved by modification of processing parameters or chemical composition. [...] Read more.
BiFeO3–BaTiO3 (BF–BT) ceramics exhibit great potential for diverse applications in high temperature piezoelectric transducers, temperature-stable dielectrics and pulsed-power capacitors. Further optimization of functional properties for different types of applications can be achieved by modification of processing parameters or chemical composition. In the present work, the influence of pentavalent niobium substitution for trivalent ferric ions on the structure, microstructure and dielectric properties of 0.7BF–0.3BT ceramics was investigated systematically. Doping with niobium led to incremental reductions in grain size (from 7.0 to 1.3 µm) and suppression of long-range ferroelectric ordering. It was found that core-shell type microstructural features became more prominent as the Nb concentration increased, which were correlated with the formation of distinct peaks in the dielectric permittivity–temperature relationship, at ~470 and 600 °C, which were attributed to the BT-rich shell and BF-rich core regions, respectively. Nb-doping of BF–BT ceramics yielded reduced electronic conductivity and dielectric loss, improved electrical breakdown strength and enhanced dielectric energy storage characteristics. These effects are attributed to the charge compensation of pentavalent Nb donor defects by bismuth vacancies, which suppresses the formation of oxygen vacancies and the associated electron hole conduction mechanism. The relatively high recoverable energy density (Wrec = 2.01 J cm−3) and energy storage efficiency (η = 68%) of the 0.7BiFeO3–0.3BaTiO3 binary system were achieved at 75 °C under an electric field of 15 kV mm−1. This material demonstrates the greatest potential for applications in energy storage capacitors and temperature-stable dielectrics. Full article
(This article belongs to the Special Issue Non-linear Dielectric Materials for Energy Storage Capacitors)
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