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Sodium bismuth titanate-based perovskite ceramics with high energy storage efficiency and discharge performance

Journal of Materiomics 2022年第5期8卷 1077-1085页

作者： Jiahui Wang Fudong Zhang Zhanhui Peng Xiaolian Chao Zupei Yang Key Laboratory for Macromolecular Science of Shaanxi Province Shaanxi Key Laboratory for Advanced Energy DevicesSchool of Materials Science and EngineeringShaanxi Normal UniversityXi'an710062ShaanxiChina

Designing dielectric materials with the tremendous energy storage density is fundamentally important for developing pulse power *** effective approach was proposed to favorably modify the dielectric energy storage properties(ESP)of Bi_(0.5)Na_(0.5)TiO_(3) ceramics using CaTiO_(3) *** dielectric breakdown strength was effectively enhanced,and simultaneously the relaxor behavior was optimized to lower the remnant polarization,which is resulted from the decreased grains size with the introduction of Ca^(2+)***,at a CaTiO_(3) doping level of 0.2,a 0.8Bi_(0.5)Na_(0.5)TiO_(3)-0.2CaTiO_(3)(0.8BNT-0.2CT)ceramic obtained both high energy storage density(Wtotal)of~1.38 J/cm^(3) together with excellent efficiency(h)of~91.3%.Furthermore,an ultrafast discharge response speed(t0:9)~94 ns was achieved in 0.8BNT-0.2CT ceramic,as well as tremendous current density(C_(D)~1520 A/cm2)and power density(P_(D)~115 MW/cm^(3)).This study not only revealed the superior ESP mechanism as regards Bi_(0.5)Na_(0.5)TiO_(3) based ceramics but also provided candidate materials in pulse power capacitor devices.

关键词： Bi_(0.5)Na_(0.5)TiO_(3)ceramics Grain size Relaxor behavior High energy storage density energy storage efficiency Ultrafast charge-discharge

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Superior energy storage efficiency through tailoring relaxor behavior and band energy gap in KNN-based ferroelectric ceramic capacitors

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Journal of Advanced Dielectrics 2023年第1期13卷 1-7页

作者： Limin Hou Changxiao Li Xinjian Wang Xiaozhi Wang Ting Wang Yu Huan School of Materials Science and Engineering University of JinanJinan 250022P.R.China Electronic Materials Research Laboratory Key Laboratory of the Ministry of Education and International Center for Dielectric ResearchXi’an Jiaotong UniversityXi’an 710032P.R.China Guangdong Provincial Key Laboratory of Electronic Functional Materials and Devices Huizhou University HuizhouGuangdong516001P.R.China

With the increasing demand of high-power and pulsed power electronic devices,environmental-friendly potassium sodium niobate((Na_(0.5)K_(0.5))NbO_(3),KNN)ceramic-based capacitors have attracted much attention in recent years owning to the boosted energy storage density(W_(rec)).Nevertheless,the dielectric loss also increases as the external electric field increases,which will generate much dissipated energy and raise the temperature of ceramic ***,an effective strategy is proposed to enhance the energy storage efficiency(η)via tailoring relaxor behavior and bad gap energy in the ferroelectric 0.9(Na_(0.5)K_(0.5))-NbO_(3)-0.1Bi(Zn_(2/3)(Nb_(x)Ta_(1−x))1/3)O_(3) *** the one hand,the more diverse ions in the B-sites owing to introducing the Ta could further disturb the long-range ferroelectric polar order to form the short−range polar nanoregions(PNRs),resulting in the highη.On the other hand,the introduction of Ta ions could boost the intrinsic band energy gap and thus improve the *** a result,high Wrec of 3.29 J/cm^(3) and ultrahighηof 90.1%at the high external electric field of 310 kV/cm are achieved in x=0.5 *** results reveal that the KNN-based ceramics are promising lead-free candidate for high-power electronic devices.

关键词： Lead-free dielectric ceramic capacitor KNN-based ceramics energy storage efficiency band gap energy relaxor behavior

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