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Ca^2+ doping effects in(K,Na,Li)(Nb0.8Ta0.2)O3 lead-free piezoelectric ceramics

Frontiers of Materials Science 2019年第4期13卷 431-438页

作者： Lei TANG Tengfei LIU Jinxu MA Xiaowen ZHANG Linan AN Kepi CHEN School of Energy Power and Mechanical EngineeringNorth China Electric Power UniversityBeijing 102206China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Department of Materials Science and Engineering Advanced Materials Processing and Analysis CenterUniversity of Central FloridaOrlandoFL 32816USA

lead-free(K0.5-x/2Na0.5-x/2Lix)(Nb0.8Ta0.2)O3(KNLNT)and(K0.49-x/2Na0.49-x/2-LixCa0.01)(Nb0.8Ta0.2)O3(KNLNT-Ca)ceramics were prepared by a conventional ceramic *** analysis shows that the Ca^2+ doping takes the A site of ABO3 perovskite and decreases the phase transition *** measurements reveal that as a donor dopant,the Ca^2+ doping results in higher room-temperature dielectric constant,lower dielectric loss,and lower mechanical quality *** addition,the Ca^2+ doping does not change the positive piezoelectric coefficient d33,but increases the converse piezoelectric coefficient d 33**** is likely due to the increase in the relaxation,as well as the appearance of(CaNa/K·-VNa/K’)defect dipoles.

关键词： lead-free piezoelectric KNN converse piezoelectric coefficient donor dopant piezoelectric property polymorphic phase transition

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lead-free piezoelectric Thick Films for Transducer Applications

Lead-free Piezoelectric Thick Films for Transducer Applicati...

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2011年全国压电和声波理论及器件应用研讨会

作者： Wei REN Electronic Materials Research Laboratory,Key Laboratory of the Ministry of Education & International Center for Dielectric Research,Xi''an Jiaotong University,Xi''an 710049,China

＜正＞Demands for miniaturized devices integrated with microelectronics lead to great interests in the design and fabrication of film piezoelectric *** devices often require high-performance piezoelectric films with thickness above 1μ*** this study,two kinds of lead free piezoelectric thick films have been ***, K0.5Na0.5NbO3（KNN） and Bi0.5Na0.5TiO3（BNT） thick films have been prepared by PVP-modified chemical solution deposition process,*** effects of annealing temperature and PVP addition on the performances of KNN and BNT thick films were systematically investigated to improve crystallization and reduce the volatility of alkali ***,Bi0.5Na0.5TiO3-Bi0.5Na0.5TiO3（BNT-BNT） and K0.5Na0.5NbO3-Bi0.5Na0.5TiO3 （KNN-BNT） 0-3 composite thick films have been prepared by a modified powder/sol-gel solution composite process. The BNT and KNN fine ceramic powders were dispersed in the BNT precursor solutions,respectively to form the uniform slurries which were spin-coated on Pt/Ti02/Si02/Si *** influence of annealing temperature and weight ratio of the powder-to-solution on the structures and electrical properties of BNT-BNT and KNN-BNT 0-3 composite thick films has been *** dielectric constant and remnant polarization of the composite thick films increase with increasing annealing temperature and with decreasing the powder-to-solution ratio due to reduction of pores and improvement of film *** of the KNN and BNT based thick films on high frequency ultrasonic transducers will be discussed.

关键词： lead-free piezoelectric Thick films Transducers

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Enhanced Humidity Stability of （Li,K, Na）NbO3-based lead-free piezoelectric Ceramics by Adding B203

Enhanced Humidity Stability of （Li,K, Na）NbO3-based Lead-f...

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中国材料大会2012

作者： Yuhua Zhen Daishan Wei Cuiping Jia Zhide Han College of Science China University of Petroleum （East China）

ISBN: (纸本)9783037856079

5wt%B203-doped （Li,K,Na）NbO3 （abbreviated as LKNN-B5）-based lead-free piezoelectric ceramics were prepared via solid state synthesis. The electrical humidity sensitive properties of LKNN-B5 ceramics were examined and compared with pure LKNN ceramics. The results revealed thatB203 doping enhanced electrical stability of LKNN-based ceramics in relative humidity （RH） range of 33-95%. The capacitance change was suppressed from 105% down to 43% when doped with B203. The average absorption time was reduced from 5.5 min to 1.5 min, and desorption time decreased from 8.5 min to 2.0 min. The enhanced electrical stability of LKNN-B5 series was attributed to the dense structure induced by liquid phase sintering.

关键词： lead-free piezoelectric relative humidity stability.

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Influence of CuO addition on dielectric and piezoelectric properties of(Bi_(0.5)Na_(0.5))TiO_(3)-BaTiO_(3) lead-free piezoceramics

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Journal of Advanced Dielectrics 2021年第3期11卷 26-31页

作者： M.Difeo L.Ramajo M.Castro Research Institute of Materials Science and Technology(INTEMA)UNMdP-CONICET Av.Colón 10850 B7606BWV Mar del Plata Argentina

Doping effects of CuO on the sintering behavior and electrical properties of 0.94(Bi_(0.5)Na_(0.5))TiO_(3)-0.06(BaTiO_(3))-xCuO(BNT-BT6-xCu)lead-free piezoceramic obtained by the conventional solid-state reaction method were *** the undoped system,it is already known that it presents the best densification values when it is sintered at 1150℃,however,the doped system was sintered at 1150℃,1100℃,1050℃,1025℃,and 975℃ to determine the effect of Cu on the densification ***,it was obtained that the CuO-doped samples sintered at 1050℃ presented the highest density values and therefore were the ones chosen to perform the characterization tests together with the undoped *** samples were characterized using X-ray diffraction(XRD),Raman microspectroscopy,and scanning electron microscopy(SEM)analysis,whereas the ferroelectric and dielectric properties were evaluated by means of ferroelectric hysteresis loops and impedance spectroscopy *** a result,the addition of CuO allowed an improvement in sinterability and densification,with the subsequent grain growth,and the improvement of the piezoelectric coefficient(d_(33)).

关键词： lead-free piezoelectric piezoelectric properties solid-state reaction CuO dopant

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Growth of single crystals in the (Na_(1/2)Bi_(1/2))TiO_(3)-(Sr_(1-x)Ca_(x))TiO_(3) system by solid state crystal growth

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Journal of Advanced Ceramics 2021年第5期10卷 973-990页

作者： Phan Gia LE Huyen Tran TRAN Jong-Sook LEE John G.FISHER Hwang-Pill KIM Wook JO Won-Jin MOONC School of Materials Science and Engineering Chonnam National University77 Yongbong-roBuk-guGwangju 61186Republic of Korea School of Materials Science and Engineering Ulsan National Institute of Science and Technology50 UNIST-gilEonyang-eupUlju-gunUlsan 44919Republic of Korea Korea Basic Science Institute Gwangju Center77 Yongbong-roBuk-guGwangju 61186Republic of Korea

Ceramics based on(Na_(1/2)B_(1/2))TiO_(3) are promising candidates for actuator applications because of large strains generated by an electric field-induced phase *** example,the(1-x)(Na_(1/2)Bi_(1/2))TiO_(3)-xSrTiO_(3) system exhibits a morphotropic phase boundary at x=0.2-0.3,leading to high values of inverse piezoelectric constant d_(33),which can be further improved by the use of single *** our previous work,single crystals of (Na_(1/2)B_(1/2))TiO_(3)-SrTiO_(3) and (Na_(1/2)Bi_(1/2))TiO_(3)-TiO_(3) were grown by the solid state crystal growth *** in the(Nai/2Bi/2)TiO3-SrTiO3 system was sluggish whereas the (Na_(1/2)B_(1/2))TiO_(3)-CaTiO_(3) single crystals grew *** the present work,0.8(Na_(1/2)Bi_(1/2))Ti0_(3)-0.2(Sr_(1-x)Ca_(x))Ti0_(3) single crystals(with x=0.0,0.1,0.2,0.3,0.4)were produced by the solid state crystal growth technique in an attempt to improve crystal growth *** dependence of mean matrix grain size,single crystal growth distance,and electrical properties on the Ca concentration was investigated in *** investigations indicated that at x=0.3 the matrix grain growth was suppressed and the driving force for single crystal growth was *** Sr with Ca increased the shoulder temperature T_(s) and temperature of maximum relative permittivity T_(max),causing a decrease in inverse piezoelectric properties and a change from normal to incipient ferroelectric behavior.

关键词： (Na_(1/2)Bi_(1/2))TiO_(3) lead-free piezoelectric single crystal microstructure electrical properties

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