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Sm and Mn co-doped PMN-PT piezoelectric ceramics:defect engineering strategy to achieve large d_(33)and high Q_(m)

Journal of Materials Science & Technology 2023年第6期137卷 143-151页

作者： Yixiao Yang Enwei Sun Zhimin Xu Huashan Zheng Bin Yang Rui Zhang Wenwu Cao Condensed Matter Science and Technology Institute School of Instrumentation Science and EngineeringHarbin Institute of TechnologyHarbin 150080China Department of Mathematics and Materials Research Institute The Pennsylvania State UniversityUniversity ParkPA 16802USA

PbTiO_(3)-based piezoelectric ceramics are key materials for developing various electromechanical *** high-power ultrasonic transducers,piezoelectric ceramics are required to possess large piezo-electric coefficient(d_(33))and high mechanical quality factor(Q_(m)).Although acceptor dopants can im-prove Q_(m),they also deteriorate d_(33).If suitable piezoelectricity-beneficial donor dopants can be intro-duced into acceptor-doped ceramics,it is very possible to obtain large d_(33)and high Q_(m)simultaneously in donor and acceptor co-doped *** this work,a series of x mol%Sm and y mol%Mn co-doped Pb(Mg_(1/3)Nb_(2/3))O_(3)-30PbTiO_(3)(PMN-30PT:x Sm,y Mn)ceramics were prepared by the solid-phase sintered *** crystal structure,local domain structure and electromechanical properties were sys-tematically *** performances were obtained in PMN-30PT:2.5Sm,1-2Mn ceramics with d_(33)=860-543 pC/N,Q_(m)=495-754,and dielectric loss tanδ=*** high performance origi-nates from the combined effects of(Mn″Ti−V_(o)^(••))^(×)defect dipoles and the local structural heterogeneity.

关键词： PMN-PT ceramics Sm and Mn co-doped Electromechanical properties defect dipoles Local structural heterogeneity

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Colossal permittivity and ultralow dielectric loss in Nb-doped SrTiO_(3) ceramics

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Journal of Advanced Ceramics 2023年第12期12卷 2247-2256页

作者： Jinghan Cai Junlei Qi Yueyang Yang Xinyue Zhang Yuan-Hua Lin State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

defect engineering has been applied to prepare materials with modifiable dielectric ***3(x=0,0.003,0.006,0.009,0.012)ceramics were synthesized using the traditional solid-state reaction method and sintered in a reducing *** samples show excellent dielectric properties with giant permittivity(>3.5×10^(4))and low dielectric loss(defects further form Ti-V_(O)^(**)-Ti'_(Ti)defect dipoles,contributing to the coexisting giant permittivity and low dielectric loss in Nb-doped SrTiO_(3)(STN)ceramics.

关键词： SrTiO_(3) colossal permittivity(CP) ultralow dielectric loss defect dipoles

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La_(2)O_(3)-modified BiYbO_(3)–Pb(Zr,Ti)O_(3) ternary piezoelectric ceramics with enhanced electrical properties and thermal depolarization temperature

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先进陶瓷(英文) 2023年第8期12卷 1593-1611页

作者： Yu Chen Lingfeng Li Zhi Zhou Yiying Wang Qiang Chen Qingyuan Wang School of Mechanical Engineering Chengdu UniversityChengdu 610106China College of Materials Science and Engineering Sichuan UniversityChengdu 610064China Institute for Advanced Study Chengdu UniversityChengdu 610106China

High-performance Pb(Zr_(1−x)Ti_(x))O_(3)(PZT)piezoceramics are urgently desired by the market in view of their expanded operating temperature range,reduced property temperature dependence,and enhanced sensitivity and acoustic *** this work,we reported a kind of low-cost and high-performance 0.06BiYbO_(3)–0.94Pb(Zr_(0.48)Ti_(0.52))O_(3) ternary piezoceramics;the modifying effects of La_(2)O_(3) on this perovskite system were investigated in terms of the structures,electrical properties,and thermal depolarization behaviors of *** field-dependent dielectric and conduction properties indicated that there are close correlations among oxygen vacancies(VO),conducting electrons,and intrinsic conduction *** degradation in ferroelectric properties observed in those samples doped with more than 0.15 wt%of La_(2)O_(3) indicated that the occupying mechanisms of La^(3+)changed from the donor substitution for Pb^(2+)to the isovalent substitution for Bi^(3+).The thermally depoling micromechanisms of ceramics were revealed from the thermodynamic processes of defect dipoles and intrinsic dipoles within ferroelectric *** sample doped with 0.15 wt%of La_(2)O_(3) shows excellent electrical properties with TC=387℃,d33=332 pC/N,TKε=5.81×10^(−3)℃−1,Pr=20.66μC/cm^(2),Td=356℃.The significantly enhanced electrical properties and thermal depolarization temperature benefited from the donor substitution of La3+,decreasing the oxygen vacancy concentration in the lattice and possibly optimizing the ferroelectric domain structure of ceramics.

关键词： BiYbO_(3)-Pb(Zr_(1−x)Ti_(x))O_(3)(BY-PZT)piezoceramics La_(2)O_(3) ferroelectric domain switching(Sswitch) defect dipoles thermal depolarization behaviors

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