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Improved energy storage performance of bismuth sodium titanate-based lead-free relaxor ferroelectric ceramics via Bi-containing complex ions doping

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Rare Metals 2023年第5期42卷 1472-1482页

作者： Wen-Jing Shi Lei-Yang Zhang Yu-Le Yang D.O.Alikin V.Ya.Shur Xiao-Yong Wei Hong-Liang Du Li Jin Electronic Materials Research Laboratory Key Laboratory of the Ministry of Education and International Center for Dielectric ResearchSchool of Electronic Science and EngineeringXi’an Jiaotong UniversityXi’an710049China School of Natural Sciences and Mathematics Ural Federal UniversityEkaterinburg620000Russia Multifunctional Electronic Ceramics Laboratory College of EngineeringXi’an International UniversityXi’an710077China

Lead-free dielectric ceramics can be used to make quick charge-discharge capacitor devices due to their high power *** use in advanced electronic systems,however,has been hampered by their poor energy storage performance(ESP),which includes low energy storage efficiency and recoverable energy storage density(Wrec).In this work,we adopted a combinatorial optimization strategy to improve the ESP in(Bi_(0.5)Na_(0.5))TiO_(3)(BNT)-based relaxor ferroelectric *** begin,the Bi-containing complex ions Bi(Mg_(2/3)Nb_(1/3))O_(3)(BMN)were introduced into a BNT-based matrix in order to improve the diffuse phase transition,increase Bi-O bond coupling,avoid macro domain development,and limit polarization response ***,the viscous polymer process was employed to reduce sample thickness and porosity,resulting in an apparent increase in breakdown strength in(1-x)[0.7(Bi_(1/2)Na_(1/2))TiO_(3)]-0.3SrTiO_(3)-xBi(Mg_(2/3)Nb_(1/3))O_(3)(BS-xBMN)***,in x=0.20 composition,an amazing Wrecof 5.62 J·cm^(-3)and an ultra-high efficiency of 91.4%were simultaneously achieved at a relatively low field of 330 kV·cm^(-1),together with remarkable temperature stability in the temperature range of 30-140℃(3.5 J·cm^(-3)±5%variation).This research presents a new lead-free dielectric material with superior ESP for use in pulsed power capacitors.

关键词： relaxor ferroelectric Energy storage performance(ESP) Viscous polymer process (Bi_(0.5)Na_(0.5))TiO_(3)(BNT)

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relaxor antiferroelectric-relaxor ferroelectric crossover in NaNbO_(3)-based lead-free ceramics for high-efficiency large-capacitive energy storage

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Chinese Chemical Letters 2024年第7期35卷 465-469页

作者： Shuangliang Xie Yuyue Chen Qing He Liang Chen Jikun Yang Shiqing Deng Yimei Zhu He Qi School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China Beijing Advanced Innovation Center for Materials Genome Engineering Department of Physical ChemistryUniversity of Science and Technology BeijingBeijing 100083China School of Mathematics and Physics University of Science and Technology BeijingBeijing 100083China Department of Condensed Matter Physics and Materials Science Brookhaven National LaboratoryUptonNew York 11973United States

relaxor ferroic dielectrics have garnered increasing attention in the past decade as promising materials for energy *** them,relaxor antiferroelectrics(AFEs)and relaxor ferroelectrics(FEs)have shown great promise in term of high energy storage density and efficiency,*** this study,a unique phase transition from relaxor AFE to relaxor FE was achieved for the first time by introducing strong-ferroelectricity BaTiO_(3)into NaNbO_(3)-BiFeO_(3)system,leading to an evolution from AFE R hierarchical nanodomains to FE polar nanoregions.A novel medium state,consisting of relaxor AFE and relaxor FE,was identified in the crossover of 0.88NaNbO_(3)–0.07BiFeO_(3)–0.05BaTiO_(3)ceramic,exhibiting a distinctive core-shell grain structure due to the composition *** harnessing the advantages of high energy storage density from relaxor AFE and large efficiency from relaxor FE,the ceramic showcased excellent overall energy storage *** achieved a substantial recoverable energy storage density W_(rec)~13.1 J/cm^(3)and an ultrahigh efficiencyη~88.9%.These remarkable values shattered the trade-off relationship typically observed in most dielectric capacitors between W_(rec)andη.The findings of this study provide valuable insights for the design of ceramic capacitors with enhanced performance,specifically targeting the development of next generation pulse power devices.

关键词： relaxor ferroelectric Antiferroelectric Core-shell Energy storage High efficiency

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Enhanced antiferroelectric-like relaxor ferroelectric characteristic boosting energy storage performance of(Bi_(0.5)Na_(0.5))TiO_(3)-based ceramics via defect engineering

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Journal of Materiomics 2022年第3期8卷 527-536页

作者： Leiyang Zhang Ruiyi Jing Yunyao Huang Qingyuan Hu DOAlikin VYa Shur Jinghui Gao Xiaoyong Wei Ling Zhang Gang Liu Yan Yan Li Jin Electronic Materials Research Laboratory Key Laboratory of the Ministry of Education&International Center for Dielectric ResearchSchool of Electronic Science and EngineeringXi'an Jiaotong UniversityXi'an710049China School of Natural Sciences and Mathematics Ural Federal UniversityEkaterinburg620000Russia State Key Laboratory of Electrical Insulation and Power Equipment School of Electrical EngineeringXi'an Jiaotong UniversityXi'an710049China Chengdu Hongke Electronic Technology Co. LtdChengdu610100China School of Materials and Energy Southwest UniversityChongqing400715China

3Lead-free(BiasNaus)TiO_(3)(BNT)-based relaxor ferroelectric(RFE)ceramics have attracted a lot of atten-tion due to their high power density and rapid charge-discharge apabilities,as well as their potential application in pulse power ***,because of the desire for smaller electronic devices,their energy storage performance(ESP)should be enhanced even *** describe a defect engineering strategy for enhancing the antiferroelectric-like RFE feature of BNT-based ceramics by unequal substi-tution of rare-earth La^(3+)in this *** ESP of La^(3+)-doped samples is raised by 25%with the same synthetic procedure and thidkness,due to an inrease in the critical electric field(E-field)and saturated E-field during polarization response,which is induced by a modifiation in the energy barrier between the lattice *** impressively,an ultrahigh recoverable energy storage density Wrec of 8.58J/cm^(3)and a high energy storage efficiengyηof 945%are simultaneously attained in 3 at.%La^(3+)-substituted 0.6(Bi_(0.5)Na_(0.4)K_(0.1))_(1-1.5x)La_(x)TiO_(3)-0.4[2/3SrTiO_(3)-1/3Bi(Mg_(2/3)Ni_(1/3))O_(3)]RFE ceamics with good temperatue stability(W_(rec)=4.6±0.2 J/cm^(3)and higher n of 290%from 30℃to 120℃),frequency stability,and fatigue *** significant inrease in ESP achieved through defect engineering not only proves the effectiveness of our strategy,but also presents a novel dielectric material with potential applications in pulse power apacitors.

关键词： BNT Energy storage performance relaxor ferroelectric Antiferroelectric-like

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Crossover from normal to diffused and relaxor ferroelectric in BaZrO_(3)- modified (Ba_(0.85)Ca_(0.15))TiO_(3) ceramics

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Journal of Materiomics 2021年第5期7卷 1094-1102页

作者： Shao Bo Chen Jia Yi Yang Shu Ya Wu Xiang Ming Chen Laboratory of Dielectric Materials School of Materials Science and EngineeringZhejiang University38 Zheda RoadHangzhou310027China

The variation of dielectric,ferroelectric and piezoelectric characteristics of BaZrO_(3)emodified(Ba_(0.85)Ca_(0.15))TiO_(3) ceramics,(1-x)(Ba_(0.85)Ca_(0.15))TiO_(3)-xBaZrO_(3),have been investigated together with the structure *** crystal structure at room-temperature varies from tetragonal to metrically cubic through orthorhombic and rhombohedral,and the morphotropic phase boundary(MPB)is determined around x=0.12 where the significantly enhanced dielectric,ferroelectric and piezoelectric characteristics are *** increasing x,the present ceramics indicate the crossover from normal to diffused and relaxor ferroelectric,and the evolution process is explored systematically.

关键词： Morphotropic phase boundary Diffused ferroelectric relaxor ferroelectric

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relaxor ferroelectric behavior of BaBi_(4)Ti_(4)O_(15) aurivillius ceramic

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Journal of Advanced Dielectrics 2013年第2期3卷 52-58页

作者： T.Badapanda R.K.Harichandan A.Mishra S.Anwar Department of Physics C.V.Raman College of Engineering BhubaneswarOdisha 752054India Department of Physics Centurion University of Technology&Management BhubaneswarOdisha 751020India Colloids&Materials Chemistry Institute of Minerals and Materials Technology BhubaneswarOdisha 751013India

Aurivillius type compound BaBi_(4)Ti_(4)O_(15)(BBT)ceramic was prepared by solid state reaction route and its electrical properties were studied.X-ray diffraction(XRD)pattern showed orthorhombic structure with space group A21am confirming it to be an m=4 member of the Aurivillius *** scanning electron microscope of the sintered pellet showed a plate-like morphology of grains which is a characteristic feature of the Aurivillius *** temperature and frequency dependence dielectric study showed a shifting of transition temperature with frequency indicating relaxor type behavior in the *** diffuseness parameter(γ)established the relaxor nature and it was attributed to the A-site cationic *** dielectric relaxation obeyed the VogelFulcher(VF)relation and various parameters like activation energy for relaxation,freezing temperature,relaxation frequency were determined after nonlinear curve *** temperature dependence of dielectric constant at temperatures much higher and lower than Tm was analyzed by two exponential functions,which gives an idea about the production of polar clusters at high temperature and the distribution of freezing temperatures at lower *** other associated parameters were calculated by nonlinear curve fitting and their significance has been explained.

关键词： Aurivillius compound diffuse phase transition relaxor ferroelectric P-E loop

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Phase evolution and relaxor to ferroelectric phase transition boosting ultrahigh electrostrains in (1-x)(Bi_(1/2)Na_(1/2))TiO_(3)-x(Bi_(1/2)K_(1/2))TiO_(3) solid solutions

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Journal of Materiomics 2022年第2期8卷 335-346页

作者： Ruiyi Jing Leiyang Zhang Qingyuan Hu DOAlikin VYa Shur Xiaoyong Wei Lin Zhang Gang Liu Haibo Zhang Li Jin Electronic Materials Research Laboratory Key Laboratory of the Ministry of Education&International Center for Dielectric ResearchSchool of Electronic Science and EngineeringFaculty of Electronic and Information EngineeringXi'an Jiaotong UniversityXi'an710049China School of Natural Sciences and Mathematics Ural Federal UniversityEkaterinburg620000Russia MIT Media Lab Massachusetts Institute of TechnologyCambridgeMA02139USA School of Materials and Energy Southwest UniversityChongqing400715China School of Materials Science and Engineering State Key Laboratory of Material Processing and Die&Mould TechnologyHuazhong University of Science and TechnologyWuhan430074China

Owing to the complex composition architecture of these solid solutions,some fundamental issues of the classical(1-x)(Bi_(1/2)Na_(1/2))TiO_(3) -x(Bi_(1/2)K_(1/2))TiO_(3)(BNT-xBKT)binary system,such as details of phase evolution and optimal Na/K ratio associated with the highest strain responses,remain *** this work,we systematically investigated the phase evolution of the BNT-xBKT binary solid solution with x ranging from 0.12 to 0.24 using not only routine X-ray diffraction and weak-signal dielectric characterization,but also temperature-dependent polarization versus electric field(P-E)and current versus electric field(I-E)*** results indicate an optimal Na/K ratio of 81/19 based on high-field polarization and elec-trostrain *** the temperature increased above 100?C,the x¼0.19 composition pro-duces ultrahigh electrostrains(>0.5%)with high thermal *** ultrahigh and stable electrostrains were primarily due to the combined effect of electric-field-induced relaxor-to-ferroelectric phase tran-sition and ferroelectric-to-relaxor diffuse phase transition during *** specifically,we revealed the relationship between phase evolution and electrostrain responses based on the characteristic tem-peratures determined by both weak-field dielectric and high-field ferroelectric/electromechanical property *** work not only clarifies the phase evolution in BNT-xBKT binary solid solution,but also paves the way for future strain enhancement through doping strategies.

关键词： Phase evolution BNT BKT Electrostrain relaxor ferroelectric Phase diagram

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Spatially-resolved relaxor to ferroelectric phase switching in 0.93Na_(1/2)Bi_(1/2)TiO_(3)-0.07BaTiO_(3) ceramics

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Journal of Materiomics 2022年第5期8卷 976-981页

作者： Xi Shi Udo Eckstein Yizhe Li David Hall Neamul H.Khansur Department of Materials Science and Engineering Friedrich-Alexander-University Erlangen-Nürnberg(FAU)ErlangenGermany Department of Materials University of ManchesterManchesterUK

In situ,spatially-resolved synchrotron X-ray diffraction was utilized to investigate the electric fieldinduced heterogenous phase transformation of nonergodic relaxor 0.93Na^(1/2)Bi^(1/2)TiO_(3)-0.07BaTiO_(3) ceramics.A Cu electrode was coated on one surface of a rectangular sample by aerosol deposition(AD),while a Pt layer was deposited on the opposite surface by sputter *** is anticipated that a different stress state and/or domain morphology should occur on the AD deposited Cu electrode side due to the particle impact-consolidation deposition *** an electric field,different sample regions,i.e.,AD,Middle,and Sputter sides,showed systematic changes in the relaxor to ferroelectric phase transition *** particular,mostgrains transformed at a sub-coercive field of 0.8 kV/mm,while the majority of thegrains only appeared to undergo transitions at a higher field(2.4 kV/mm).Also,the tetragonal phase became the dominant structure at higher field ***,bothandgrains undergo phase switching at lower fields in the region close to the AD-processed *** study indicates that the AD process-induced stress can facilitate the electric field-induced relaxor to ferroelectric phase transition,i.e.,the AD Cu side showed more significant lattice strain and domain texture than the sputter Pt side.

关键词： relaxor ferroelectric Synchrotron X-ray diffraction Phase transformation

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Optimizing energy harvesting performance by tailoring ferroelectric/relaxor behavior in KNN-based piezoceramics

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Journal of Advanced Ceramics 2022年第6期11卷 935-944页

作者： Yu HUAN Xinjian WANG Wenyu YANG Limin HOU Mupeng ZHENG Tao WEI Xiaohui WANG School of Materials Science and Engineering University of JinanJinan 250022China Key Laboratory of Advanced Functional Materials Faculty of Materials and ManufacturingBeijing University of TechnologyBeijing 100124China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

Piezoelectric energy harvesters(PEHs)fabricated using piezoceramics could convert directly the mechanical vibration energy in the environment into electrical *** high piezoelectric charge coefficient(d_(33))and large piezoelectric voltage coefficient(g_(33))are key factors for the high-performance ***,high d_(33)and large g_(33)are difficult to simultaneously achieve with respect to g_(33)=d_(33)/(e_(0)e_(r))and d_(33)=2Qe_(0)e_(r)P_(r).Herein,the energy harvesting performance is optimized by tailoring the CaZrO_(3)content in(0.964−x)(K_(0.52)Na_(0.48))(Nb_(0.96)Sb_(0.04))O_(3)-0.036(Bi_(0.5)Na_(0.5))ZrO_(3)-xCaZrO_(3)***,the doping CaZrO_(3)could enhance the dielectric relaxation due to the compositional fluctuation and structural disordering,and thus reduce the domain size to~30 nm for x=0.006 *** nanodomains switch easily to external electric field,resulting in large ***,the rhombohedral-orthorhombic-tetragonal phases coexist in x=0.006 sample,which reduces the polarization anisotropy and thus improves the piezoelectric *** multiphase coexistence structures and miniaturized domains contribute to the excellent piezoelectric properties of d_(33)(354 pC/N).Furthermore,the dielectric relative permittivity(ε_(r))reduces monotonously as the CaZrO_(3)content increases due to the relatively low ion polarizability of Ca^(2+)and Zr^(4+).As a result,the optimized energy conversion coefficient(d_(33)×g_(33),5508×10^(−15)m^(2)/N)is achieved for x=0.006 *** importantly,the assembled PEH with the optimal specimen shows the excellent output power(~48 mW)and lights up 45 red commercial light-emitting diodes(LEDs).This work demonstrates that tailoring ferroelectric/relaxor behavior in(K,Na)NbO_(3)-based piezoelectric ceramics could effectively enhance the electrical output of PEHs.

关键词： piezoelectric energy harvesters(PEHs) potassium sodium niobate(KNN) relaxor ferroelectric miniaturized domains multiphase coexistence

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High energy storage capability of perovskite relaxor ferroelectrics via hierarchical optimization

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Rare Metals 2022年第3期41卷 730-744页

作者： Min-Hao Zhang Jun-Lei Qi Yi-Qian Liu Shun Lan Zi-Xi Luo Hao Pan Yuan-Hua Lin State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Innovation Team for New High Volumetric Efﬁcient MLCC Materials and Devices Foshan(Southern China)Institute for New MaterialsFoshan 528000China Division of Physics and Applied Physics School of Physical and Mathematical SciencesNanyang Technological UniversitySingapore 639798Singapore

Ultrafast charge/discharge process and ultrahigh power density enable dielectrics essential components in modern electrical and electronic devices, especially in pulse power systems. However, in recent years, the energy storage performances of present dielectrics are increasingly unable to satisfy the growing demand for miniaturization and integration, which stimulates further researches on dielectrics with higher energy density and *** various inorganic dielectrics, perovskite relaxor ferroelectrics are recognized as promising candidates for energy storage applications, with high permittivity and relatively high efficiency. Here, we focus on recent progress and achievements on optimizing perovskite relaxor ferroelectrics toward better energy storage capability through hierarchical design. The principles and key parameters of dielectric energy storage, together with the definition of majority types of dielectrics, are introduced at first. Strategies within various scales include domain, grain size, orientation, and composite engineering are summarized. The existing challenges are presented and future prospects are proposed in the end, with the background of both academic explorations and industrial applications.

关键词： Dielectric Energy storage Capacitance Perovskite relaxor ferroelectric

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Large electrocaloric effect over a wide temperature span in lead-free bismuth sodium titanate-based relaxor ferroelectrics

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Journal of Materiomics 2023年第2期9卷 289-298页

作者： Xiaopo Su Junjie Li Yuxuan Hou Ruowei Yin Jianting Li Shiqiang Qin Yanjing Su Lijie Qiao Chuanbao Liu Yang Bai Beijing Advanced Innovation Center for Materials Genome Engineering and Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing100083China School of Materials Science and Engineering University of Science and Technology BeijingBeijing100083China College of Optoelectronic Engineering Chengdu University of Information TechnologyChengdu610225China School of Mechanical and Automotive Engineering Qilu University of Technology(Shandong Academy of Sciences)Jinan250353China

For efficient solid-state refrigeration technologies based on electrocaloric effect(ECE),it is a great challenge of simultaneously obtaining a large adiabatic temperature change(DT)within a wide temperature span(Tspan)in lead-free ferroelectric ***,we studied the electrocaloric effect(ECE)in(1-x)(Na_(0.5)Bi_(0.5))TiO_(3)-xCaTiO_(3)((1-x)NBT-xCT)and explored the combining effect of morphotropic phase boundary(MPB)and relaxor *** addition of CT not only constructs a MPB region with the coexistence of rhombohedral and orthorhombic phases,but also enhances the relaxor *** ECE peak appears around the freezing temperature(Tf),and shifts toward to lower temperature with the increasing CT *** directly measured ECE result shows that the ceramic of x=0.10,which is in the MPB region,has an optimal ECE property of DTmax=1.28 K@60℃under 60 kV/cm with a wide Tspan of 65*** enhanced ECE originates from the electric-field-induced transition between more types of polar nanoregions and long-range ferroelectric *** the composition with more relaxor feature in the MPB region,such as x?0.12,the ECE is relatively weak under low electric fields but it exhibits a sharp increment under a sufficiently high electric *** work provides a guideline to develop the solidestate cooling devices for electronic components.

关键词： Electrocaloric effect relaxor ferroelectric Morphotropic phase boundary (Na_(0.5)Bi_(0.5))TiO_(3)

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