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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

Effect of doped Mn on piezoelectric properties of (Na_(0.5)Bi_(0.5))_ (0.92)Ba_(0.08)TiO_3 lead-free ceramics

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Journal of Central South University of Technology 2005年第3期12卷 266-268页

作者：周小元顾豪爽李位勇 Faculty of Physics and Electronic Technology Hubei UniversityWuhan 430062China

piezoelectric ceramics (Na0.5Bi0.5) （0.92）Ba0.08TiO3 +x%MnCO3（BNBT-Mn, x=0CD*21.6, mass fraction） were synthesized by conventional solid state reaction. The results show that when the addition of MnCO3 is 0CD*2 1.4%, BNBT-Mn ceramics exhibit a single-phase perovskite structure. With the increase of content of MnCO3, piezoelectric constant and electromechanical coupling factor increase rapidly when x is lower than 0.3. Then they both decrease when x is in the range of 0.3 and 1.6. When x=0.3, piezoelectric constant and electromechanical coupling factor reach the maximum value of 160pC/N and 58.5% respectively, which can improve the temperature stability of BNBT-Mn.

关键词： lead-free ceramics Mn piezoelectric properties

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

Enhanced piezoelectric properties of Nd^(3+) doped nano-lead zirconate titanate piezoelectric ceramics

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Journal of Harbin Institute of Technology(New Series) 2008年第5期15卷 669-673页

作者：刘红梅张德庆王大伟赵全亮袁杰曹茂盛 School of Materials Science and Chemistry Harbin Engineering University Key lab of integrate circuit Heilongjiang University College of Chemical Engineering Qiqihar University Scohool of Material Science and Engineering Beijing Institute of Technology

Nd3+ doped lead zirconate titanate (Pb1-3x/2NdxZr0.52Ti0.48O3, PNZT) nanopowders were prepared through a modified sol-gel method. The effects of Nd3+ doping on the microstructures and properties of PNZT ceramics have been studies. The grain sizes of the perovskite PNZT nanopowders were about 100nm and the lattice distortion of the PNZT increased with the content of Nd3+ up to 9 mol%. The dopant of Nd3+ resulted in the decrease of crystal lattice parameter a and the obvious increase of c and c/a, which effectively improved the sintered densification and activity of the PNZT ceramics. Due to lead vacancies caused by the doping of Nd3+ in the PZT, the piezoelectric constant, electromechanical coupling coefficient and dielectric constant observed were much higher than the monolithic PZT.

关键词： PNZT PZT sol-gel piezoelectric properties

Convenient folding-hot-pressing fabrication and enhanced piezoelectric properties of highβ-phasecontent poly(vinylidene fluoride)films

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Interdisciplinary Materials 2024年第5期3卷 715-725页

作者： Jie Shen Yicheng Zeng Qiangzhi Li Jing Zhou Wen Chen State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and EngineeringWuhan University of TechnologyWuhanChina Sanya Science and Education Innovation Park Wuhan University of TechnologySanyaChina Hubei Longzhong Laboratory Wuhan University of Technology Xiangyang Demonstration ZoneXiangyangChina

Poly(vinylidene fluoride)(PVDF)is the most attractive piezoelectric polymer for application in flexible *** attain excellent piezoelectric properties,a substantial amount of spontaneous polarβ-phase content is highly ***,the current reported manufacturing methods to increaseβ-phase contents are inconvenient and complex,hindering progress in PVDF's *** work proposes a folding-hot-pressing method to fabricate highβ-phase-content PVDF *** characterization indicates that the films haveαandβphases and the folding-hot-pressing process transforms theαphase into theβ*** to the 97.5%β-phase content and aligned structure,a piezoelectric constant of 20 pC/N is achieved in the three-times folded ***,the process method enhances the tensile strength(126.2 MPa)of the films,with a low Young's modulus(0.87 GPa)remaining,making the films applicable for flexible piezoelectric ***,sensors based on the achieved films were assembled and applied for human physiological activity *** work offers a scalable new melt-processing strategy for developing high-performance PVDF-based piezo-electric composite films for wearable electronic devices.

关键词： flexible sensors highβ-phase content piezoelectric properties PVDF film

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

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.

Structure,microstructure,dielectric and piezoelectric properties of(1−x-y)BiFeO_(3)-xPbFe_(0.5)Nb_(0.5)O_(3)-yPbTiO_(3)ceramics

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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 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