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potassium sodium niobate based lead-free ceramic for high-frequency ultrasound transducer applications

Journal of Materiomics 2020年第3期6卷 513-522页

作者： Jie Xing Laiming Jiang Chunlin Zhao Zhi Tan Qian Xu Jiagang Wu Qiang Chen Dingquan Xiao Jianguo Zhu College of Materials Science and Engineering Sichuan University610064ChengduChina Roski Eye Institute Keck School of MedicineUniversity of Southern CaliforniaLos AngelesCA90033USA Key Laboratory of Deep Underground Science and Engineering(Ministry of Education) School of Architecture and EnvironmentSichuan UniversityChengdu610065China Sichuan Province Key Laboratory of Information Materials and Devices Application Chengdu University of Information Technology610103ChengduChina

The BiAlO_(3)(BA)and(Bi_(0.5)Na_(0.5))ZrO_(3)(BNZ)are selected to form a solid solution with(K_(0.48)Na_(0.52))NbO_(3) via traditional solid state technique to optimize the electrical performance and temperature stability of KNNbased lead-free ceramics,simultaneously.Here we show that doped BA has a great influence on phase structure,morphologies,and electrical properties.The XRD patterns and dielectric constant versus temperature curves reveal that an increase in the BA content results in a transform of phase structures from a coexistence state of rhombohedral,orthorhombic and tetragonal phases to pseudocubic phase.Owing to the construction of R-O-T phase boundary,optimized performances(T_(C)~336℃,d_(33)~306 pC/N,kp=0.48)are obtained in 0.962(K_(0.48)Na_(0.52))NbO_(3)-0.003BiAlO_(3)-0.035(Bi_(0.5)Na_(0.5))ZrO_(3)(KNN-3)ceramics.Based on the sintered KNN-3 ceramic samples,high-frequency ultrasound imaging transducers are designed and fabricated,which exhibits a high center frequency of 24.5 MHz,a broad -6 dB bandwidth of 97% and a high-sensitivity.Finally,the imaging characteristic of the lead-free transducers is demonstrated via ex vivo imaging of biological tissue structure.As environment friendly materials,the excellent electrical and acoustic performance of developed KNN-based ceramics has great potential for practical applications.

关键词： potassium sodium niobate Lead free piezoceramics Thermal stability Ultrasound imaging transducers

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Preparation and piezoelectric properties of potassium sodium niobate glass ceramics

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Chinese Physics B 2015年第6期24卷 560-563页

作者：姜珊王炫明李佳宇张勇郑涛吕景文 Material Science and Engineering Institute Changchun University of Science and Technology Beijing University of Posts and Telecommunications China Building Materials Academy

This paper describes the preparation of a piezoelectric glass ceramic material from potassium sodium niobate （Ko.sNa0.sNbO3; KNN） using a novel melting method. The effects of the subsequent heat-treatment on the optical, thermal, electrical, and mechanical properties of the material are carefully examined, and its crystal structure and surface morphol- ogy are characterized respectively by x-ray diffraction and scanning electron microscopy. This new material has a much higher piezoelectric coefficient （163 pC.N-1） than traditional piezoelectric ceramics （131 pC.N-1 ）. On this basis therefore, a strategy for the future study and development of lead-free KNN-based piezoelectric glass ceramics is proposed.

关键词： potassium sodium niobate dielectric constant piezoelectric constant

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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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Effects of Ge4＋ acceptor dopant on sintering and electrical properties of （K0.5Na0.5）NbO3 lead-free piezoceramics

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Frontiers of Materials Science 2017年第1期11卷 59-65页

作者： Kepi CHEN Yanlin JIAO School of Energy Power and Mechanical Engineering North China Electric Power University Beijing 102206 China

Lead-free （K0.5Na0.5）（Nb1-xGex）O3 （KNN-xGe, where x = 0-0.01） piezo- electric ceramics were prepared by conventional ceramic processing. The effects of Ge4＋cation doping on the phase compositions, microstructure and electrical properties of KNN ceramics were studied. SEM images show that Ge4＋ cation doping improved the sintering and promoted the grain growth of the KNN ceramics. Dielectric and ferroelectric measurements proved that Ge4＋ cations substituted Nbs＋ ions as acceptors, and the Curie temperature （Tc） shows an almost linear decrease with increasing the Ge4＋ content. Combining this result with microstructure observations and electrical measurements, it is concluded that the optimal sintering temperature for KNN-xGe ceramics was 1020℃. Ge4＋ doping less than 0.4 mol.% can improve the compositional homogeneity and piezoelectric properties of KNN ceramics. The KNN-xGe ceramics with x = 0.2% exhibited the best piezoelectric properties： piezoelectric constant d33 = 120 pC/N, planar electromechanical coupling coefficient kp = 34.7%, mechanical quality factor Qm = 130, and tanδ = 3.6%.

关键词： lead-free piezoelectric ceramics potassium sodium niobate doping sintering dielectric relaxation piezoelectric properties

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Improvement in synthesis of （K0.5Na0.5）NbO3 powders by Ge4＋ acceptor doping

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Frontiers of Materials Science 2016年第4期10卷 422-427页

作者： Yajing ZHAO Yan CHEN Kepi CHEN School of Energy Power and Mechanical Engineering North China Electric Power University Beijing 102206 China Chemical and Engineering Materials Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA

In this paper, the effects of doping with GeO2 on the synthesis temperature, phase structure and morphology of （K0.5Na0.5）NbO3 （KNN） ceramic powders were studied using XRD and SEM. The results show that KNN powders with good crystallinity and compositional homogeneity can be obtained after calcination at up to 900℃ for 2 h. Introducing 0.5 mol.% GeO2 into the starting mixture improved the synthesis of the KNN powders and allowed the calcination temperature to be decreased to 800℃, which can be ascribed to the formation of the liquid phase during the synthesis.

关键词： lead-free piezoelectrics potassium sodium niobate synthesis acceptordoping

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BiCoO3-doped （Ko.47sN ao.47sLio.os）（N bo.8Tao.2）03 lead-free piezoelectric ceramics

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Frontiers of Materials Science 2012年第4期6卷 311-318页

作者： Ke-Pi CHEN Zhe ZHANG School of Energy Power and Mechanical EngineeringNorth China Electric Power UniversityBeijing 102206China

（1-x）（K0.47sNa0.475Li0.os）（Nb0.sTa0.2）O3-xBiCoO3 （KNLNT-BC） lead-free piezoelectric ceramics were prepared by the conventional solid-state sintering method. Effects of the BC content on the phase structure, microstructure and electrical properties of KNLNT-BC ceramics were investigated. XRD patterns reveal that all the ceramic samples are in the pure perovskite-type structure, and the phase structure changes from the tetragonal to pseudo-cubic phase with the increase of the BC content. After the substitution of BC, the grain size is significantly reduced and relaxer behaviors are induced. By adding a small amount of BC to KNLNT ceramics, piezoelectric properties are improved, while further addition of BC makes the piezoelectric properties deteriorate markedly. The optimized electrical properties atx= 0.005 are as follows： d33 = 194 pC/N, kp = 0.44.

关键词： lead-free ceramic potassium sodium niobate BiCo03 piezoelectric property

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A REVIEW ON LEAD-FREE PIEZOELECTRIC CERAMICS STUDIES IN CHINA

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Journal of Advanced Dielectrics 2011年第3期1卷 269-288页

作者： YI-QING LU YONG-XIANG LI The Key Lab of Inorganic Functional Materials and Devices Shanghai Institute of Ceramics Chinese Academy of Sciences 1295 Dingxi RoadShanghai 200050P.R.China

There are a large number of research publications on the hot topic of environmental friendly leadfree piezoelectric materials worldwide in the last decade.The number of researchers and institutions involved from China is much larger than other countries or regions.The publications by Chinese researchers cover a broad spectrum on the preparations,structures,properties and applications of lead-free piezoelectric ceramics.This has motivated us to come out with a review on recent advances in development of lead-free piezoelectric ceramics in China.The emphases are especially on the preparation and electric properties of barium titanate-based materials,bismuth sodium titanate and related materials,alkaline niobate and related materials,bismuth layerstructured materials,as well as texture engineering of ceramics and some of their single crystals.Hopefully,this could give further impetus to the researchers to continue their e®orts in this promising area and also draw the attentions from legislature,research o±ce,industrial and publics.

关键词： Lead-free piezoelectric ceramic barium titanate bismuth sodium titanate potassium sodium niobate bismuth layer-structured ferroelectrics texture single crystal

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