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Exceptional electrostrain with minimal hysteresis and superior temperature stability under low electric field in KNN-based lead-free piezoceramics

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Journal of Advanced Ceramics 2024年第3期13卷 364-372页

作者： Huan Liu Yijin Hao Ziqi Yang Tianyi Feng Bin Su Xin Zhang Mengping Xue Bo-Ping Zhang Jing-Feng Li Beijing Municipal Key Laboratory of New Energy Materials and Technologies School of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijing 100083China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

Over the past two decades,(K_(0.5)Na_(0.5))NbO_(3)(KNN)-based lead-free piezoelectric ceramics have made significant progress.However,attaining a high electrostrain with remarkable temperature stability and minimal hysteresis under low electric fields has remained a significant challenge.To address this long-standing issue,we have employed a collaborative approach that combines defect engineering,phase engineering,and relaxation engineering.The LKNNS-6BZH ceramic,when sintered at T_(sint)=1170℃,demonstrates an impressive electrostrain with a d_(33) value of 0.276%and 1379 pm·V^(-1)under 20 kV·cm^(-1),which is comparable to or even surpasses that of other lead-free and Pb(Zr,Ti)O_(3)ceramics.Importantly,the electrostrain performance of this ceramic remains stable up to a temperature of 125℃,with the lowest hysteresis observed at 9.73%under 40 kV·cm^(-1).These excellent overall performances are attributed to the presence of defect dipoles involving V′_(A)-V∙∙_(O) and B′_(Nb)-V∙∙O,the coexistence of R-O-T multiphase,and the tuning of the trade-off between long-range ordering and local heterogeneity.This work provides a lead-free alternative for piezoelectric actuators and a paradigm for designing piezoelectric materials with outstanding comprehensive performance under low electric fields.

关键词： lead-free piezoelectric ceramics temperature stability electrostrain potassium sodium niobate low hysteresis

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Ultrahigh electrostrain with excellent fatigue resistance in textured Nb^(5+)-doped(Bi_(0.5)Na_(0.5))TiO3-based piezoceramics

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Journal of Advanced Ceramics 2023年第3期12卷 487-497页

作者： Lixiang Lai Zhihao Zhao Shuo Tian Bao Ou Gaoyuan Liang Bin Li Yejing Dai School of Materials Sun Yat-sen UniversityShenzhen 518107China

(Bi_(0.5)Na_(0.5))TiO_(3)(BNT)-based lead-free piezoceramics exhibit excellent electric field-induced strain(electrostrain)properties,but often suffer from large hysteresis and poor fatigue resistance,which strongly limit their applications.Here,textured Nb5+-doped 0.8(Bi_(0.5)Na_(0.5))TiO_(3)–0.2(Bi_(0.5)K_(0.5))TiO_(3)(0.8BNT–0.2BKT)ceramics with a high degree of texturing(~80%)were prepared by the reactive template grain growth(RTGG)method using Bi4Ti3O12 as a template.By the combination of donor doping in the B-site and the RTGG method,the electrostrain performance achieves a significant enhancement.A high electrostrain of 0.65%and a piezoelectric coefficient(*33 d)of 1083 pm/V with reduced hysteresis at an electric field of 6 kV/mm are obtained.No electrostrain performance degradation is observed after unipolar electric field loading of 10^(5)cycles,showing excellent fatigue endurance.These results indicate that the texturing BNT-based lead-free piezoceramics by the RTGG method is a useful approach to developing eco-friendly actuators.

关键词： (Bi_(0.5)Na_(0.5))TiO_(3)(BNT)-based ceramics donor doping electrostrain textured ceramics

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Large electrostrain in Bi_(1/2)Na_(1/2)TiO_(3)-based relaxor ferroelectrics:A case study of Bi_(1/2)Na_(1/2)TiO3-Bi_(1/2)K_(1/2)TiO_(3)-Bi(Ni_(2/3)Nb_(1/3))O_(3) ceramics

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Journal of Materiomics 2021年第3期7卷 593-602页

作者： Guangzhi Dong Huiqing Fan Laijun Liu Pengrong Ren Zhenxiang Cheng Shujun Zhang State Key Laboratory of Solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an710072China Institute for Superconducting and Electronic Materials Australia Institute of Innovative MaterialsUniversity of WollongongWollongong2522Australia College of Materials Science and Engineering Guilin University of TechnologyGuilin541004China Shaanxi Province Key Laboratory for Electrical Materials and Infiltration Technology School of Materials Science and EngineeringXi’an University of TechnologyXi’an710048China

(1-x)(0.8Bi_(1/2)Na_(1/2)TiO3-0.2Bi_(1/2)K_(1/2)TiO3)-xBi(Ni_(2/3)Nb_(1/3))O3(BNKT-xBNN)solid solution ceramics were fabricated by high temperature solid-state reaction method.All the compositions possess relaxor ferroelectric features,among which the ergodic BNKT-0.02BNN exhibits large repeatable electrostrain value Suni¼0.51%at electric field of 65 kV/cm,with high piezoelectric stain coefficient d33*of 890 pm/V at 45 kV/cm,while the non-ergodic compositions present unrepeatable large strain response.Based on the electric field-composition phase diagram,the repeatability of strain response in ergodic compositions can be attributed to the reversible electric-field-induced phase transition.In addition,the effects of BNN contents on the macroscopic strain properties are explored by analyzing the existing states of the polar regions with corresponding thermal evolutions and electric-field-induced phase transitions.This research is expected to guide the design of lead free relaxor ferroelectric materials with desired electrostrain properties.

关键词： BNT electrostrain Mechanism Lead free Relaxor ferroelectric Phase diagrams

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High depolarization temperature and superior piezoelectric performance with complex structural evolution in BiFeO_(3)-PbTiO_(3)-(Sr0.7Bi0.2,0.1)TiO_(3) systems

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Journal of Materiomics 2022年第6期8卷 1260-1268页

作者： Hongwei Shi Feng Li Xinliang Yang Mingsheng Long Lei Shan Chunchang Wang Jiwei Zhai Information Materials and Intelligent Sensing Laboratory of Anhui Province Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of EducationInstitutes of Physical Science and Information TechnologyAnhui UniversityHefei230601China Laboratory of Dielectric Functional Materials School of Materials Science and EngineeringAnhui UniversityHefei230601China School of Materials Science&Engineering Tongji University4800 Caoan RoadShanghai201804China

Bismuth ferriteebased ferroelectric ceramics are considered strong competitors in highetemperature piezoelectric applications that benefits from their high depolarization temperature(Td),but problems of large conductivity and low piezoelectric coefficient(d33)should be tackled.BiFeO_(3)ePbTiO_(3)ex(Sr0.7Bi0.2,0.1)TiO_(3)(BFePTexSBT)ternary system are designed in this work that successfully resolves this tough paradox.Rietveld refinements show that this system exhibits multiphase coexistence with complex structural transition among rhombohedral,tetragonal and pseudocubic phase.Interestingly,a high Td~320℃ and d33~236℃/N are synergistically optimized in x=0.20 composition near pseudoephase boundary,which are indicated by multiescale techniques(phase structure,dielectric analysis etc.).What'smore,dual electrostrain peaks appear at separate phase boundaries for x=0.20 and 0.66 compositions with distinct piezo/ferroelectric properties.Rayleigh law and piezoelectric force microscopy analysis clarify that the optimal electrostrain performance for both critical compositions are dominated by intrinsic(x=0.20)and extrinsic(x=0.66)contributions,respectively.This work not only provides a new BFePTexSBT system with a high Td and superior d33 that are promising candidates in highetemperature actuator and sensor applications,but also presents a possibility of multiphaseecoexistence established exotic macroscopic performances.

关键词： BiFeO_(3)-based Piezoelectric electrostrain Multiphaseecoexistence Domain switching

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Ultra-slim electrostrains with superior temperature-stability in leadfree sodium niobate-based ferroelectric perovskite

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Journal of Materiomics 2022年第6期8卷 1230-1238页

作者： Ruiyi Jing Qingyuan Hu Leiyang Zhang Yuan Sun Jiagang Wu D.O.Alikin V.Ya Shur Xiaoyong Wei Hongliang Du Yunfei Chang 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 Functional Materials and Acousto-Optic Instruments Institute School of Instrumentation Science and EngineeringHarbin Institute of TechnologyHarbin150080China Department of Materials Science Sichuan UniversityChengdu610065China School of Natural Sciences and Mathematics Ural Federal UniversityEkaterinburg620000Russia Multifunctional Electronic Ceramics Laboratory College of EngineeringXi'an International UniversityXi'an710077China

Large electrostrains with high temperature stability and low hysteresis are essential for applications in high-precision actuator devices.However,achieving simultaneously all three of the aforementioned features in ferroelectric ceramics remains a considerable challenge.In this work,we firstly report a high unipolar electrostrain(0.12%at 60 kV/cm)in(1ex)NaNbO_(3)-x[(Ba0.85Ca0.15)(Zr_(0.1)Ti_(0.9))O_(3)](NN-xBCZT)ferroelectric polycrystalline ceramics with excellent thermal stability(variation less than 10%in the temperature range of 30-160℃)and ultra-low hysteresis(electrostrain response is dominated by the intrinsic electrostrictive effect,which may account for more than 80%of the electrostrain.Furthermore,due to the thermal stability of the polarization in the pure tetragonal phase,the large electrostrain demonstrates extraordinarily high stability from room temperature to 140℃.Finally,in-situ piezoelectric force microscopy reveals ultra-highly stable domain structures,which also guarantee the thermal stability of the electrostrain in(NN-xBCZT ferroelectrics ceramics.This study not only clarifies the origin of thermally stable electrostrain in NN-xBCZT ferroelectric perovskite in terms of electrostrictive effect,but also provides ideas for developing applicable ferroelectric ceramic materials used in actuator devices with excellent thermal stability.

关键词： electrostrain Electrostriction NaNbO_(3) Polarization

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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 unresolved.In 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)curves.Our results indicate an optimal Na/K ratio of 81/19 based on high-field polarization and elec-trostrain characterizations.As the temperature increased above 100?C,the x¼0.19 composition pro-duces ultrahigh electrostrains(>0.5%)with high thermal stability.The 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 heating.More 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 characterizations.This 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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Dielectric and ferroelectric properties of CuO-doped lead magnesium niobate-based relaxor ferroelectric ceramics

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Journal of Advanced Dielectrics 2019年第4期9卷 54-62页

作者： Li Jin Jing Pang Yunyao Huang Wenting Luo Xu Lu Xiaoyong Wei Electronic Materials Research Laboratory Key Laboratory of the Ministry of Education&International Center for Dielectric Research School of Electronic Science and Engineering Faculty of Electronic and Information Engineering Xi’an Jiaotong University Xi’an 710049P.R.China Laboratory of Functional Films School of Materials Science and Engineering Xi’an University of Technology Xi’an 710048 P.R.China

In this work,we report the dielectric and ferroelectric properties of CuO-doped(1-x)[0.5573Pb(Mg_(1/3)Nb_(2/3))O_(3)-0.4427PbTiO_(3)]-xBa(Zn_(1/3)Nb_(2/3))_(3)(PMNT-xBZN)relaxor ferrielectric ceramic samples with x=0.1725,0.1925,02125 and 0.2325,which were fabricated by a conventional solid-state reaction method.By introducing the CuO into PMNT-xBZN,the sintering temperature of this system is drastically lowered from 1280℃to 1120℃.The second pyrochlore phase,which is often generated during sintering at high temperature,is also inhibited.Meanwhile,broad dielectric peaks with strong dielectric relaxation characteristics are observed from150℃to 100℃.Slim and slanted P-E hysteresis loops and purely electrostrictive strains with V-shape are obtained simultaneously in studied compositions from 30℃to 150℃.These results suggest that CuO could effectively lower the sintering temperature while maintaining the dielectric and ferroelectric properties of PMNT-xBZN relaxor ferroelectric ceramics.

关键词： Pb(Mg_(1/3)Nb_(2/3))O_(3)(PMN) relaxor ferroelectrics sintering additive ferroelectric electrostrain

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揭示相共存体系PbTiO;-BiScO;中内在和外在压电贡献（英文）

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Science China Materials 2021年

作者：孙胜东刘辉任洋 Manuel Hinterstein 陈骏 Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology Beijing Department of Physical Chemistry University of Science and Technology Beijing School of Mathematics and Physics University of Science and Technology Beijing X-Ray Science Division Advanced Photon Source Argonne National Laboratory Institute of Applied Materials Ceramic Materials and Technologies Karlsruhe Institute of Technology

PbTiO;-BiScO;陶瓷兼具高压电系数和高居里温度,在高温传感器和制动器领域极具应用潜力.探明潜在的压电机理对其应用具有重要作用.本文结合先进原位电场高能同步辐射技术和STRAP分析方法,定量揭示了PbTiO;-BiScO;体系相界附近较高应变... 详细信息

PbTiO;-BiScO;陶瓷兼具高压电系数和高居里温度,在高温传感器和制动器领域极具应用潜力.探明潜在的压电机理对其应用具有重要作用.本文结合先进原位电场高能同步辐射技术和STRAP分析方法,定量揭示了PbTiO;-BiScO;体系相界附近较高应变的内在和外在贡献.观察到在共存的四方相和三方相之间发生了电场诱导的相转变.实验发现畴反转应变主要来源于四方相,而占主导作用的晶格应变主要来源于少量共存的三方相.电场诱导了相含量的变化,定量分析结果表明该体系中可逆应变主要源于内在的晶格应变.相反,不可逆的畴反转应变导致了较大的剩余应变.现有结论表明,将剩余应变转化为可逆应变将是提高压电性能的战略方向.本研究有助于进一步理解高压电性能并有望推进PbTiO;-BiScO;体系的应用.

关键词： PbTiO -BiScO piezoelectricity in situ synchrotron diffraction electrostrain

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