Dielectric and energy storage properties of flash-sintered high-entropy (Bi0.2Na0.2K0.2Ba0.2Ca0.2)TiO3 ceramic

Jia Liu; Ke Ren; Cuiying Ma; Huiling Du; Yiguang Wang

doi:10.1016/j.ceramint.2020.05.090

Dielectric and energy storage properties of flash-sintered high-entropy (Bi_0.2Na_0.2K_0.2Ba_0.2Ca_0.2)TiO₃ ceramic

Jia Liu, Ke Ren, Cuiying Ma, Huiling Du, Yiguang Wang^*

^*Corresponding author for this work

Institute of Advanced Structure Technology

Research output: Contribution to journal › Article › peer-review

166 Citations (Scopus)

Abstract

A high-entropy (Bi_0.2Na_0.2K_0.2Ba_0.2Ca_0.2)TiO₃ (BNKBCT) ceramic is successfully fabricated by using flash sintering technique. The synthesis and densification of BNKBCT are simultaneously carried out by a stepwise current-ramping flash sintering process. Despite the presence of excessive Na⁺ and K⁺ ions, single-phase perovskite ceramics are obtained with uniform elemental distribution. The dielectric characterization reveals the relaxor ferroelectric nature of BNKBCT ceramic. Moreover, the discharge energy storage density and efficiency of the as-prepared BNKBCT ceramic are 0.684 J/cm³ and 87.5% under the electric field of 129 kV/cm, respectively. These results indicate that the introduction of high entropy is a viable strategy to tune the properties of electrical ceramics.

Original language	English
Pages (from-to)	20576-20581
Number of pages	6
Journal	Ceramics International
Volume	46
Issue number	12
DOIs	https://doi.org/10.1016/j.ceramint.2020.05.090
Publication status	Published - 15 Aug 2020

Keywords

Electrical properties
Flash sintering
High-entropy ceramics
Polar units

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title = "Dielectric and energy storage properties of flash-sintered high-entropy (Bi0.2Na0.2K0.2Ba0.2Ca0.2)TiO3 ceramic",

abstract = "A high-entropy (Bi0.2Na0.2K0.2Ba0.2Ca0.2)TiO3 (BNKBCT) ceramic is successfully fabricated by using flash sintering technique. The synthesis and densification of BNKBCT are simultaneously carried out by a stepwise current-ramping flash sintering process. Despite the presence of excessive Na+ and K+ ions, single-phase perovskite ceramics are obtained with uniform elemental distribution. The dielectric characterization reveals the relaxor ferroelectric nature of BNKBCT ceramic. Moreover, the discharge energy storage density and efficiency of the as-prepared BNKBCT ceramic are 0.684 J/cm3 and 87.5% under the electric field of 129 kV/cm, respectively. These results indicate that the introduction of high entropy is a viable strategy to tune the properties of electrical ceramics.",

keywords = "Electrical properties, Flash sintering, High-entropy ceramics, Polar units",

author = "Jia Liu and Ke Ren and Cuiying Ma and Huiling Du and Yiguang Wang",

note = "Publisher Copyright: {\textcopyright} 2020 Elsevier Ltd and Techna Group S.r.l.",

year = "2020",

month = aug,

day = "15",

doi = "10.1016/j.ceramint.2020.05.090",

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TY - JOUR

T1 - Dielectric and energy storage properties of flash-sintered high-entropy (Bi0.2Na0.2K0.2Ba0.2Ca0.2)TiO3 ceramic

AU - Liu, Jia

AU - Ren, Ke

AU - Ma, Cuiying

AU - Du, Huiling

AU - Wang, Yiguang

PY - 2020/8/15

Y1 - 2020/8/15

N2 - A high-entropy (Bi0.2Na0.2K0.2Ba0.2Ca0.2)TiO3 (BNKBCT) ceramic is successfully fabricated by using flash sintering technique. The synthesis and densification of BNKBCT are simultaneously carried out by a stepwise current-ramping flash sintering process. Despite the presence of excessive Na+ and K+ ions, single-phase perovskite ceramics are obtained with uniform elemental distribution. The dielectric characterization reveals the relaxor ferroelectric nature of BNKBCT ceramic. Moreover, the discharge energy storage density and efficiency of the as-prepared BNKBCT ceramic are 0.684 J/cm3 and 87.5% under the electric field of 129 kV/cm, respectively. These results indicate that the introduction of high entropy is a viable strategy to tune the properties of electrical ceramics.

AB - A high-entropy (Bi0.2Na0.2K0.2Ba0.2Ca0.2)TiO3 (BNKBCT) ceramic is successfully fabricated by using flash sintering technique. The synthesis and densification of BNKBCT are simultaneously carried out by a stepwise current-ramping flash sintering process. Despite the presence of excessive Na+ and K+ ions, single-phase perovskite ceramics are obtained with uniform elemental distribution. The dielectric characterization reveals the relaxor ferroelectric nature of BNKBCT ceramic. Moreover, the discharge energy storage density and efficiency of the as-prepared BNKBCT ceramic are 0.684 J/cm3 and 87.5% under the electric field of 129 kV/cm, respectively. These results indicate that the introduction of high entropy is a viable strategy to tune the properties of electrical ceramics.

KW - Electrical properties

KW - Flash sintering

KW - High-entropy ceramics

KW - Polar units

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U2 - 10.1016/j.ceramint.2020.05.090

DO - 10.1016/j.ceramint.2020.05.090

M3 - Article

AN - SCOPUS:85084607177

SN - 0272-8842

VL - 46

SP - 20576

EP - 20581

JO - Ceramics International

JF - Ceramics International

IS - 12

ER -

Dielectric and energy storage properties of flash-sintered high-entropy (Bi_0.2Na_0.2K_0.2Ba_0.2Ca_0.2)TiO₃ ceramic

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