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Journal of Advanced Dielectrics 2022年第1期12卷 45-52页

作者： E.I.Sitalo N.A.Boldyrev L.A.Shilkina A.V.Nazarenko A.V.Nagaenko L.A.Reznichenko Research Institute of Physics Southern Federal University No 194 Stachki Ave.Rostov-on-Don 344090Russia Southern Scientific Center of RAS No.41 Chekhov Ave. Rostov-on-Don 344006Russia Institute of High Technology and Piezo Technic Southern Federal UniversityNo 10 Milchakov St.Rostov-on-Don 344090Russia

Ceramics of quasi-binary concentration section(x=0.50,0.1≤y≤0.2,Δy=0.025)of the ternary solid solution system(1−x−y)BiFeO_(3)-xPbFe_(0.5)Nb_(0.5)O_(3)-yPbTiO_(3)were prepared by the conventional solid-phase reaction *** using X-ray diffraction technique,the phase diagram of the system was constructed,which was shown to contain the regions of cubic and tetragonal symmetry and the morphotropic phase boundary between *** morphology,dielectric and piezoelectric properties of the selected solid solutions were *** highest piezoelectric coefficient d_(33)=260 pC/N was *** characteristics of ceramics revealed ferroelectric relaxor behavior,a region of diffuse phase transition from the paraelectric to ferroelectric phase in the temperature range of 350-500 K.

关键词： Dielectric properties perovskites multiferroics piezoelectric properties solid solutions

Enhanced piezoelectric properties in low-temperature sintering PZN-PZT ceramics by adjusting Zr/Ti ratio

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Journal of Advanced Dielectrics 2022年第2期12卷 43-48页

作者： Yaxia Luo Tao Pu Shibo Fan Hong Liu Jianguo Zhu College of Materials Science and Engineering Sichuan UniversityChengdu 610064P.R.China

Pb_(0.96)Sr_(0.04)(Zr,Ti)_(0.7)(Zn_(1/3)Nb_(2/3))_(0.3)O_(3)(PZN-PZT)piezoceramics with various Zr/Ti ratios and Li_(2)CO_(3)sintering aid were sintered at 900°C by the solid-state reaction *** samples with different Zr/Ti ratios were compared according to microstructure,phase structure,piezoelectricity,ferroelectricity,and dielectric *** Zr/Ti ratio in the PZN-PZT ceramics greatly affects the electrical *** Zr/Ti ratio affects the proportion between the rhombohedral and tetragonal phases and also affects the grain *** PZN-PZT ceramics with the Zr/Ti ratio of 53:47 have the largest grain size and have optimized piezoelectric prop-erties(k_(p)=0.58,d_(33)=540 pC/N,and T_(C)=250°C).The larger the grain size,the lesser the grain boundary,the easier the domain wall motion,and the better the piezoelectric *** PZT ceramic with Zr/Ti ratio of 53:47 locates the morphotropic phase boundary(MPB)region which is one of the key factors for the high piezoelectric properties of the PZT.

关键词： piezoelectric properties ferroelectric properties low-temperature sintering PZT MPB

Enhanced piezoelectric properties and temperature stability in KNN-based textured ceramics

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Journal of Advanced Dielectrics 2022年第5期12卷 12-18页

作者： Yan Lin Ru Wang Jiawei Qu Shuo Gao Yi Zhang Junli Yan Jigong Hao Peng Li Wei Li School of Materials Science and Engineering Liaocheng University Liaocheng 252059P.R.China

Considering the advantages of high Curie temperature and environment-friendly nature of KNN piezoelectric ceramics,the limitation of weak piezoelectric response and their temperature sensitivity to applications is worth ***,thetextured(1-x)(K_(0.5)Na_(0.5))(Nb0.96Sb0.04)O3-x(Bi_(0.5)Na_(0.5))HfO_(3)(x=0.01-0.045)lead-free ceramics were synthesized by templated grain-growth *** high piezoelectric performance(d33 of 474 pC/N and strain of 0.21%)and excellent temperature stability(unipolar strain maintained within 4.3%change between 30℃and 165℃)were simultaneously achieved in the textured KNNS-0.03BNH *** high piezoelectric performance can be attributed to the summation of the crystallographic anisotropy and phase structure contributions intextured *** superior temperature stability of piezoelectric properties can be interpreted by the contribution of crystal anisotropy to piezoelectric properties reduces the effect of phase transition on piezoelectric properties *** study provides an effective strategy for simultaneously achieving high piezoelectric properties and superior temperature stability in KNN-based textured ceramics.

关键词： Textured ceramics phase structure piezoelectric properties temperature stability

Dielectric and piezoelectric properties of(Li,Ce) modified NaBi_5Ti_5O_(18) composite ceramics

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Journal of Rare Earths 2009年第3期27卷 496-500页

作者：马磊赵琨李吉夏吴琪赵明磊王春雷 School of Physics Shandong University

Nominal （Li0.5Ce0.5）x（Na0.5Bi0.5）（1-x）Na0.5Bi4.5Ti5O18 composite ceramics were fabricated using conventional solid-state reaction method. The coexistence of bismuth layer-structured phase and perovskite phase was determined in these ceramics using XRD technique. At room temperature, the x=0.11 sample showed the largest piezoelectric constant, d33, of about 26.5 pC/N and the largest electromechanical coupling factor, kt, of about 30%. Even after annealing at 500 ℃, the value of d33 was still about 19 pC/N, in x=0.08-0.11 samples. Moreover these composite ceramics showed low temperature coefficients of dielectric constant and high electrical resistivity in the temperature region of 450-550 ℃. These results indicated that （Li, Ce） modified NaBi5Ti5O18 composite ceramics were promising piezoelectric materials for high-temperature applications.

关键词： ferroelectrics composite ceramics dielectric properties piezoelectric properties electrical resistivity rare earths

Preparation and piezoelectric properties of CuO-added(Ag_(0.75)Li_(0.1)Na_(0.1)K_(0.05_)NbO_3 Lead-free Ceramics

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Journal of Wuhan University of Technology(Materials Science) 2015年第4期30卷 724-728页

作者：吴浪 NING Haixia State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials Southwest University of Science and Technology Department of Materials Engineering Mianyang Vocational and Technical College

CuO-doped（Ag0.75Li0.1Na0.1K0.05）NbO3（ALNKN-xCuO, x = 0.2mol%） lead-free piezoelectric ceramics were prepared by the solid-state reaction method in air atmosphere. The effects of CuO addition on the phase structure, microstructure, and piezoelectric properties of the ceramics were investigated. The experimental results show that the ALNKN ceramics without doping CuO possess rhombohedral phase along with K2NbrO16- type phase and metallic silver phase. For all of the CuO-doped ALNKN ceramics, a pure perovskite structure with the orthorhombic phase was obtained by enclosing the samples in a corundum tube. A homogeneous microstructure with＇the grain size of about 1 ~tm was formed for the ceramics with 0.5mo1% CuO. The grain size increases with increasing amount of CuO. The temperature dependence of dielectric properties indicates that the ferroelectric phase of the ALNKN-xCuO ceramics becomes less stable with the addition of CuO. The ceramics with x = lm01% exhibit relatively good electrical properties along with a high Curie temperature. These results will provide a helpful guidance to preparing other AN-based ceramics by solid-state reaction method in air atmosphere.

关键词： (Ag0.75Li0.1Na0.1K0.05)NbO3 lead-free ceramics piezoelectric properties CuO

Dielectric and piezoelectric properties of 0-3 PZT/PVDF Composite Doped with Polyaniline

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Journal of Wuhan University of Technology(Materials Science) 2006年第1期21卷 84-87页

作者：徐任信 School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070 China

Lead zirconate titanate （ PZT ） / polyvinylidene fluoride （PVDF） 0-3 piezoelectric composites doped with polyaniline （PANI） were obtained by hot-press method. The polarization properties of the composites were characterized by XRD and P- E hysteresis loops at room temperature. And the dielectric and piezoelectric properties were also measured. The results show that the poling of PZT could be effectively carried oat and the dielectric constant e, and dissipation tanδ increase monatonously by increasing the volume fraction of PANI in the composite. The piezoelectric constant d33, and the planar electromechanical coupling factor kp increase while the mechanical quality factor Qm decreases with the increase in the content of PANI. The d33, kp and Qm show the extremum values at 8 vol%-10 vol% PANI.

关键词： piezoelectric composite polyaniline dielectric properties piezoelectric properties

Grain boundary effects on piezoelectric properties of the core–shell-structured BaTiO_(3)@TiO_(2) ceramics

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Journal of Advanced Dielectrics 2018年第6期8卷 118-126页

作者： Xixi Li Zhonghua Yao Juan Xie Zongxin Li Hua Hao Minghe Cao Amjad Ullah Atta Ullah Abdul Manan Hanxing Liu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Material Science and Engineering Wuhan University of Technology Wuhan 430070P.R.China Department of Physics University of Science and Technology BannuKPKPakistan

Grain boundary effect on BaTiO_(3) has been widely investigated for several ***,all of them tailored the grain boundary by grain size of BaTiO_(3).In this case,a direct way was introduced to modify the grain boundary by coating technique to investigate the role of grain boundary in ferroelectric *** phase TiO_(2) was employed to investigate grain boundary effects on the electrical properties of BaTiO3 piezoelectric ***_(2) coating can result in the reduction of piezoelectric and ferroelectric properties and the annealing process in oxygen can increase piezoelectric behavior of pure BaTiO3 due to valence state of Ti ions while that remains for Ti-modified composition possibly due to the increased grain boundary effect by impedance *** with ferroelectric grain,grain boundary plays a critical role to impact the electrical properties of perovskite-type ferroelectric materials.

关键词： piezoelectric properties ferroelectric properties BaTiO3 and titanates defects

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

Improved ferroelectric and piezoelectric properties of(Na_(0.5)K_(0.5))NbO_(3)ceramics via sintering in low oxygen partial pressure atmosphere and adding LiF

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Journal of Advanced Dielectrics 2021年第2期11卷 27-33页

作者： Bing-Yu Li Xiao-Ming Chen Mei-Dan Liu Zi-De Yu Han-Li Lian Jian-Ping Zhou School of Physics and Information Technology Shaanxi Normal University Xi’an 710119 P.R.China School of Science Xi’an University of Posts and Telecommunications Xi’an 710121 P.R.China

Dense(Na_(0.5)K_(0.5))NbO_(3)lead-free ceramics with the simple composition were prepared via sintering in low oxygen partial pressure(pO_(2),~10^(−12) atm)atmosphere and adding *** the ceramics have pure orthorhombic *** to the LiF-added(Na_(0.5)K_(0.5))NbO_(3)ceramics sintered in air and the low pO_(2)-sintered pure(Na_(0.5)K_(0.5))NbO_(3)ceramics without LiF addition,the present ceramics exhibit improved piezoelectric and ferroelectric *** piezoelectric constant d33 is 125 pC/N,and the converse piezoelectric constant d_(33)^(*)is 186 pm/*** dielectric constant and dielectric loss of the ceramics at room temperature and 1 kHz are 451 and 0.03,*** the measured electric field of 70 kV/cm,the remanent polarization is 25.9μC/cm^(2)and the coercive field is 13.9 kV/***,if the base metals such as Cu and Ni powders were mixed into the green pellets and sintered in the low pO_(2)atmosphere,the base metals cannot be oxidized,suggesting possibility of using base metals as electrodes.

关键词： Ceramics dielectric properties ferroelectric properties piezoelectric properties Na_(0.5)K_(0.5)NbO_(3)

Grain size effect on piezoelectric properties of Sr_(2)Nb_(2)O_(7)ceramics

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Journal of Advanced Dielectrics 2018年第4期8卷 1-5页

作者： Tao Chen Zhiyong Zhou Ruihong Liang Xianlin Dong Shanghai Institute of Ceramics Key Laboratory of Inorganic Functional Materials and Devices Chinese Academy of Sciences 1295 Dingxi Road Shanghai 200050P.R.China University of Chinese Academy of Sciences Shijingshan District Beijing 100049P.R.China ShanghaiTech University 100 Haike RoadShanghai 201210P.R.China State Key Laboratory of High Performance Ceramics and Superfine Microstructures Shanghai Institute of Ceramics Chinese Academy of Sciences Shanghai 200050P.R.China

Grain size effect on piezoelectric properties and thermal stability of perovskite layer structured(PLS)Sr_(2)Nb_(2)O_(7) ceramics are *** Sr2Nb2O7 ceramics with different average grain sizes from 1.2μm to 3.6μm were prepared in different sintering temperatures by solid state reaction *** average grain size increases,accompanied by a higher relative density of up to 96%.Pure Sr_(2)Nb_(2)O_(7) ceramics with larger grain size show a remarkable d33 of(1:70:1)pC/N while still with a very high T_(c) of(1340±4)℃.The thermal depolarization temperature of samples with large grain sizes reach over 1200℃ and the thermal stability increased with increasing of grain *** ferroelectric domains structure was observed by PFM and larger grain is easy to form ferroelectric domain then enhance piezoelectric *** study demonstrates enhanced piezoelectric properties can be achieved in pure Sr_(2)Nb_(2)O_(7) by solid state reaction method and bring great revitalization to the Sr_(2)Nb_(2)O_(7)-based ceramics as a promising high-temperature piezoelectric material.

关键词： Grain size piezoelectric properties layer structure.