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Enhancement of Nonlinear Dielectric Properties in BiFeO(3)–BaTiO(3) Ceramics by Nb-Doping

BiFeO(3)–BaTiO(3) (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 modifica...

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Detalles Bibliográficos
Autores principales: Yang, Ziqi, Wang, Bing, Li, Yizhe, Hall, David A.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9031403/
https://www.ncbi.nlm.nih.gov/pubmed/35454569
http://dx.doi.org/10.3390/ma15082872
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author Yang, Ziqi
Wang, Bing
Li, Yizhe
Hall, David A.
author_facet Yang, Ziqi
Wang, Bing
Li, Yizhe
Hall, David A.
author_sort Yang, Ziqi
collection PubMed
description BiFeO(3)–BaTiO(3) (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 (W(rec) = 2.01 J cm(−3)) and energy storage efficiency (η = 68%) of the 0.7BiFeO(3)–0.3BaTiO(3) 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.
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spelling pubmed-90314032022-04-23 Enhancement of Nonlinear Dielectric Properties in BiFeO(3)–BaTiO(3) Ceramics by Nb-Doping Yang, Ziqi Wang, Bing Li, Yizhe Hall, David A. Materials (Basel) Article BiFeO(3)–BaTiO(3) (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 (W(rec) = 2.01 J cm(−3)) and energy storage efficiency (η = 68%) of the 0.7BiFeO(3)–0.3BaTiO(3) 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. MDPI 2022-04-14 /pmc/articles/PMC9031403/ /pubmed/35454569 http://dx.doi.org/10.3390/ma15082872 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Yang, Ziqi
Wang, Bing
Li, Yizhe
Hall, David A.
Enhancement of Nonlinear Dielectric Properties in BiFeO(3)–BaTiO(3) Ceramics by Nb-Doping
title Enhancement of Nonlinear Dielectric Properties in BiFeO(3)–BaTiO(3) Ceramics by Nb-Doping
title_full Enhancement of Nonlinear Dielectric Properties in BiFeO(3)–BaTiO(3) Ceramics by Nb-Doping
title_fullStr Enhancement of Nonlinear Dielectric Properties in BiFeO(3)–BaTiO(3) Ceramics by Nb-Doping
title_full_unstemmed Enhancement of Nonlinear Dielectric Properties in BiFeO(3)–BaTiO(3) Ceramics by Nb-Doping
title_short Enhancement of Nonlinear Dielectric Properties in BiFeO(3)–BaTiO(3) Ceramics by Nb-Doping
title_sort enhancement of nonlinear dielectric properties in bifeo(3)–batio(3) ceramics by nb-doping
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9031403/
https://www.ncbi.nlm.nih.gov/pubmed/35454569
http://dx.doi.org/10.3390/ma15082872
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