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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

Designing high piezoelectric properties at the BaTiO_(3)–PbZrO_(3)–PbTiO_(3)phase boundary by Landau–Devonshire theory

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Journal of Advanced Dielectrics 2024年第2期14卷 33-41页

作者： Yu Song Xiaoming Shi Dan Li Jing Wang Houbing Huang School of Materials Science and Engineering Beijing Institute of Technology Beijing 100081P.R.China Advanced Research Institute of Multidisciplinary Science Beijing Institute of Technology Beijing 100081P.R.China School of Electronic Information and Electrical Engineering Chengdu University Chengdu 610100P.R.China

Ferroelectric materials possessing exceptional piezoelectric attributes have garnered widespread utilization in various *** solution systems improve piezoelectric properties through multiphase mixing,but the methodologies for effective design remain *** on the Landau–Devonshire theory,we propose a theoretical design *** materials with morphotropic phase boundary(MPB)compositions are added with new elements to increase the free energy of the original stabilized phase and lower the energy barrier(EB).Flatter EBsand higher piezoelectric coefficients are found at the phase boundaries of the ternary *** calculating the phase diagram,piezoelectric coefficient,dielectric constant,polarization,and EBs,we reveal the origin of the highest piezoelectric coefficient at the phase *** study underscores the importance of the EBs for polarization rotation in characterizing piezoelectric properties and proposes a theoretical design method for exploring materials with high piezoelectric coefficients.

关键词： BaTiO_(3)-PbZrO_(3)-PbTiO_(3) piezoelectric properties free energy barrier thermodynamic calculation Landau-Devonshire theory

Enhancing the dielectric and piezoelectric properties of Pb_(0.99)Gd_(0.01)Zr_(0.53)Ti_(0.47)O_(3) ferroelectric ceramics by Sr-doping

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Journal of Advanced Dielectrics 2024年第4期14卷 71-79页

作者： Xingyu Wang Lingfeng Li Yu Chen School of Mechanical Engineering Chengdu University Chengdu 610106P.R.China

Recently,high-performance lead zirconate titanate(Pb(Zr_(1-x)Ti_(x))O_(3),PZT)ferroelectric ceramics have attracted intensive attention due to their wider operating temperature range,better temperature stability,as well as larger piezoelectric properties and higher energy conversion *** this study,the perovskite-type ferroelectric ceramics with a chemical formula of Pb_(0.99-x)Gd_(0.01)Sr_(x)Zr_(0.53)Ti_(0.47)O_(3)(x=0 and 0.02,*** and PGSZT,respectively)were prepared by the traditional solid-state reaction *** influences of Sr-doping on the phase structure,dielectric properties,ferroelectric properties and piezoelectric properties of the PGZT ceramics were comprehensively *** field-dependent P–E hysteresis loops of PGSZT were measured in the frequency range of 0.05–10 Hz and temperature range of 20–100℃.The results show that Sr-doping not only enhances the dielectric permittivity and piezoelectric coefficient of PGZT,but also decreases its dielectric loss tangent,with the d_(33) value of 473 pC/N,ε_(r) value of 1586 and tanδvalue of 0.016 found in ***,PGSZT shows a high Curie temperature(T_(C))of 350℃.The underlying mechanisms of the property enhancement were identified as that the introduced Sr^(2+) replaces the volatile Pb^(2+) located at the A-site of the perovskite structure,thereby reducing the concentration of lead vacancies and promoting the grain growth of the ceramics,consequently enhancing the dielectric and piezoelectric properties of *** the other hand,the frequency change in the low-frequency range(<1 Hz)played a significant impact on the remanent polarization(P_(r))and internal biased electric field(E_(i))of PGSZT,but the frequency dependence of coercive field(E_(c))tends to diminish in the high-frequency range(≥1 Hz).

关键词： Pb(Zr_(1-x)Ti_(x))O_(3) Sr-doping dielectric properties piezoelectric properties ferroelectric ceramics

Enhanced piezoelectric properties in low-temperature sintered Pb(Zr,Ti)O_(3)-based ceramics via Yb_(2)O_(3)doping

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Journal of Advanced Dielectrics 2024年第4期14卷 30-37页

作者： Wanfeng Zhuang Weiling Wang Yaxia Luo Hong Liu Jianguo Zhu College of Materials Science and Engineering Sichuan University Chengdu 610065 P.R.China

Pb(Mg_(0.5)W_(0.5))O_(3)–Pb(Ni_(1/3)Nb_(2/3))O_(3)–Pb(Zr_(0.5)Ti_(0.5))O_(3)(PNN–PMW–PZT)piezoceramics were sintered at a low temperature of 900℃by the mixed metal oxide powder solid-state reaction ***_(3)and Li_(2)CO_(3)as sintering aids and Yb_(2)O_(3)as a dopant were added into the PNN–PMW–PZT ceramic system for low-temperature sintering and enhancement of electrical properties,*** effects of different Yb_(2)O_(3)doping amounts on the microstructure,dielectric,piezoelectric and ferroelectric properties of the samples were systematically *** piezoceramics doped with 0.1 mol%Yb_(2)O_(3)have optimal electrical properties(d_(33)=563 pC/N,k_(p)=0.66,ε_(r)=2728(1 kHz),tanδ=0.0176(1 kHz),and T_(C)=301℃).While the piezoceramics doped with 0.3 mol%Yb_(2)O_(3)have optimal energy conversion properties:the piezoelectric voltage coefficient g_(33)=26.7×10^(-3)Vm/N and the effective piezoelectric energy conversion coefficient d_(33)×g_(33)=14366×10^(-15)m^(2)/N.

关键词： piezoelectric properties ferroelectric properties low-temperature sintering PZT energy conversion coefficient

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

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

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

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

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