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Comprehensive optimization of piezoelectric coefficient and depolarization temperature in Mn-doped Bi_(0.5)Na_(0.5)TiO_(3)-Bi_(0.5)K_(0.5)TiO_(3)-BaTiO_(3)lead-free piezoceramics

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Journal of Materials Science & Technology 2024年第5期172卷 255-263页

作者： Huashan Zheng enwei sun Huajie Luo Xiaoyu Zhang Yixiao Yang Bin Yang Rui Zhang Shantao Zhang Wenwu Cao Condensed Matter Science and Technology Institute School of Instrumentation Science and EngineeringHarbin Institute of TechnologyHarbin150080China Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing100083China National Laboratory of Solid State Microstructures Department of Materials Science and EngineeringCollege of Engineering and Applied Science&Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing210093China Department of Mathematics and Materials Research Institute The Pennsylvania State UniversityUniversity ParkPennsylvania16802United States of America

Lead-free Bi_(_(0.5))Na_(_(0.5))TiO_(3)(BNT)piezoelectric ceramics have the advantages of large coercive fields and high Curie *** the improvement of piezoelectric coefficient(d 33)is usually accompanied by a huge sacrifice of depolarization temperature(T d).In this work,a well-balanced performance of d 33 and T d is achieved in MnO_(2)-doped 0.79(Bi_(_(0.5))Na_(_(0.5))TiO_(3))-0.14(Bi_(0.5)K_(0.5)TiO_(3))-0.07BaTiO_(3)ternary *** in-corporation of 0.25 mol%MnO_(2)enhances the d 33 by more than 40%,while T d remains almost unchanged(i.e.,d 33=181 pC/N,T d=184℃).X-ray diffraction(XRD)shows that an appropriate fraction of the small axis-ratio ferroelectric phase(pseudo-cubic,P c)coexists with the long-range ferroelectric phase(tetrag-onal,T)under this MnO_(2)*** force microscopy(PFM)has revealed a special domain configuration,namely large striped and layered macro domains embedded with small *** study provides a distinctive avenue to design BNT-based piezoelectric ceramics with high piezoelectric performance and temperature stability.

关键词： BNT-BKT-BT ceramics Mn doping Piezoelectric Depolarization temperature Phase structure

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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)

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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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Large photovoltaic effect with ultrahigh open-circuit voltage in relaxor-based ferroelectric Pb(In_(1/2)Nb_(1/2))O_(3)-Pb(Mg_(1/3)Nb_(2/3))O_(3)-PbTiO_(3)ceramics

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Journal of Materials Science & Technology 2022年第9期104卷 119-126页

作者： Xudong Qi Kai Li enwei sun Bingqian Song Da Huo Jiaming Li Xianjie Wang Rui Zhang Bin Yang Wenwu Cao Condensed Matter Science and Technology Institute School of Instrumentation Science and EngineeringHarbin Institute of TechnologyHarbin 150080China Key Laboratory for Photonic and Electronic Bandgap Materials Ministry of EducationSchool of Physics and Electronic EngineeringHarbin Normal UniversityHarbin 150025China School of Physics Harbin Institute of TechnologyHarbin 150001China Department of Mathematics and Materials Research Institute The Pennsylvania State UniversityUniversity ParkPennsylvania 16802USA

Recently,the anomalous photovoltaic effect of ferroelectric materials has attracted considerable attention in the construction of efficient solar cells owing to the above-bandgap photovoltage of these *** this study,we investigate the anomalous photovoltaic effect of relaxor-based ferroelectric Pb(In_(1/2)Nb_(1/2))O_(3)-Pb(Mg_(1/3)Nb_(2/3))O_(3)-PbTiO_(3)(PIMN-PT)ceramics with large remnant polarization and a narrow optical *** photovoltaic performance with an ultrahigh open-circuit voltage of 23 V(575 V/cm)is achieved,which is higher than the open-circuit voltages of all reported polycrystalline materials with similar *** phase structure,microstructure morphology,domain structure,ferroelectric and optical characteristics are analyzed,which could provide clues to the origin of the ultrahigh open-circuit voltage of PIMN-PT *** results suggest that the relaxor-based ferroelectric PIMNPT system is a potential candidate for photovoltaic solar energy conversion devices.

关键词： Photovoltaic Ferroelectric PIMN-PT ceramics Open-circuit voltage Domain structure

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Fluorescence-based quantitative characterization of structural phase transitions in Li^(+)/Er^(3+):BaTiO_(3)ferroelectric ceramics

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Journal of Materials Science & Technology 2021年第33期92卷 143-147页

作者： Jiaming Li enwei sun Yaping Ma Huashan Zheng Hua Zhao Zhiguo Zhang School of Physics Harbin Institute of TechnologyHarbin 150001China Condensed Matter Science and Technology Institute School of Instrumentation Science and EngineeringHarbin Institute of TechnologyHarbin 150080China School of Materials and Engineering Harbin Institute of TechnologyHarbin 150001China

We propose a method to quantitatively characterize the fine phase transition processes of Li^(+)/Er^(3+):BaTiO_(3)(BLET)ferroelectric materials by observing fluorescence wavelength shift.A lithium and erbium co-doped barium titanate ferroelectric ceramic was fabricated and the down-conversion infrared fluorescence spectra of the transition^(4)I13/2→^(4)I15/2 were measured as a function of *** three structural phase transition processes,namely rhombohedral-orthorhombic,orthorhombic-tetragonal,and tetragonal-cubic transformations,determined by X-ray diffraction results are accompanied by corresponding changes in the position of the fluorescence peaks,yielding an exact *** contactless,non-destructive and spatially-resolved fluorescence method provides a localized quantitative analysis for the phase transition processes of BLET *** this method is based on the fluorescence peak wavelength dependence on the crystal environment,it may potentially be used to characterize the phase transitions in other ferroelectric materials.

关键词： Ferroelectrics Phase transition Fluorescence X-ray diffraction

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Domain structure and dielectric diffusion-relaxation characteristics of ternary Pb(In_(1/2)Nb_(1/2))O_(3)-Pb(Mg_(1/3)Nb_(2/3))O_(3)-PbTiO_(3)ceramics

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Journal of Advanced Dielectrics 2022年第6期12卷 8-17页

作者： Xudong Qi Kai Li Lang Bian enwei sun Limei Zheng Rui Zhang School of Physics and Electronic Engineering Harbin Normal University Harbin 150025P.R.China Guangdong Provincial Key Laboratory of Electronic Functional Materials and Devices Huizhou University Huizhou 516001P.R.China School of Instrumentation Science and Engineering Harbin Institute of Technology Harbin 150080P.R.China School of Physics State Key Laboratory of Crystal Materials Shandong UniversityJinan 250100P.R.China

Relaxor-based ternary Pb(In1/2Nb1/2)O_(3)-Pb(Mg_(1/3)Nb_(2/3))O_(3)-PbTiO_(3)(PIN-PMN-PT)single crystals and ceramics are promising candidates for high-performance electromechanical conversion *** is known that the domain structure and dielectric diffusion-relaxation characteristics are crucial to the excellent performances of relaxor *** this work,we prepared the PIN-PMN-PT ceramics with various PIN/PMN proportions and systematically investigated their domain structure and dielectric diffusion-relaxation *** effect of PIN/PMN proportion on the domain size and dielectric diffusion-relaxation characteristics was also *** investigations showed that PIN-PMN-PT ceramics presented multi-type domain patterns comprising irregular island domains and regular lamellar ***,the dependent relations of PIN/PMN proportions on the dielectric diffusion and domain size indicated that the PIN composition has a stronger lattice distortion than PMN composition;increasing the PIN proportion can enhance the dielectric diffusion and decrease the domain *** results could deepen the understanding of structure-property relationships of multicomponent relaxor ferroelectrics and guide the design and exploration of new high-performance ferroelectric materials.

关键词： Piezoelectric ceramics PIN-PMN-PT dielectric diffusion and relaxation characteristics domain structure

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The complexity of structural variations in Brassica rapa revealed by assembly of two complete T2T genomes

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Science Bulletin 2024年第15期69卷 2346-2351页

作者： Yifan Zhou Hanzhe Ye enwei Liu Jingjing Tian Liping Song Zhiyong Ren Man Wang Zhenghui sun Liguang Tang Zhongyue Ren Jinquan Li Qijun Nie Aihua Wang Kun Wang State Key Laboratory of Hybrid Rice Hubei Hongshan LaboratoryCollege of Life SciencesWuhan UniversityWuhan 430072China Wuhan Vegetable Research Institute Wuhan Academy of Agricultural SciencesWuhan 430045China Institute of Economic Crops Hubei Academy of Agricultural SciencesWuhan 430064China Institute for Advanced Studies Wuhan UniversityWuhan 430072China RNA Institute Wuhan UniversityWuhan 430072China

Brassica has long been of paramount importance to agriculture and human nutrition. Among the Brassica genus, Brassica rapa,the AA diploid, stands out as a prominent representative, valued for its versatility both as a vegetable and oil crop and its genetic proximity to other Brassica species. Economically, B. rapa plays an important role in the food industry, contributing to 12%of the global edible oil supply and 10%of vegetable yield [1].

关键词： structural proximity assembly

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Optical and Radiative Properties of Aerosols during a Severe Haze Episode over the North China Plain in December 2016

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Journal of Meteorological Research 2017年第6期31卷 1045-1061页

作者： Yu ZHENG Huizheng CHE Leiku YANG Jing CHEN Yaqiang WANG Xiangao XIA Hujia ZHAO Hong WANG Deying WANG Ke GUI Linchang AN Tianze sun Jie YU Xiang KUANG Xin LI enwei sun Dapeng ZHAO Dongsen YANG Zengyuan GUO Tianliang ZHAO Xiaoye ZHANG Key Laboratory of Meteorological Disaster Ministry of Education/Joint International Research Laboratory of Climate and Environment Change/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters/Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological AdministrationNanjing University of Information Science&TechnologyNanjing 210044 State Key Laboratory of Severe Weather/Institute of Atmospheric Composition of China Meteorological Administration Chinese Academy of Meteorological SciencesBeijing 100081 School of Surveying and Land Information Engineering Henan Polytechnic UniversityJiaozuo 454000 Shijiazhuang Meteorological Bureau Shijiazhuang 050081 Laboratory for Middle Atmosphere and Global Environment Observation Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029 6 University of Chinese Academy of Sciences Beijing 100049 National Meteorological Center China Meteorological AdministrationBeijing 100081 Institute of Meteorological Science of Jilin Province Changchun 130062 Key Laboratory for Earth System Modeling of Ministry of Education Department of Earth System Scienceand Joint Center for Global Change StudiesTsinghua UniversityBeijing 100084

The optical and radiative properties of aerosols during a severe haze episode from 15 to 22 December 2016 over Beijing, Shijiazhuang, and Jiaozuo in the North China Plain were analyzed based on the ground-based and satellite data, meteorological observations, and atmospheric environmental monitoring data. The aerosol optical depth at 500 nm was 〈 0.30 and increased to 〉 1.4 as the haze pollution developed. The Angstr6m exponent was 〉 0.80 for most of the study period. The daily single-scattering albedo was 〉 0.85 over all of the North China Plain on the most polluted days and was 〉 0.97 on some particular days. The volumes of fine and coarse mode particles during the haze event were approximately 0.05-0.21 and 0.01-0.43 μm^3, respectively-that is, larger than those in the time without haze. The daily absorption aerosol optical depth was about 0.01-0.11 in Beijing, 0.01-0.13 in Shijiazhuang, and 0.01-0.04 in Jiaozuo, and the average absorption Angstrom exponent varied between 0.6 and 2.0. The aerosol radiative forcing at the bottom of the atmosphere varied from -23 to -227, -34 to -199, and -29 to -191 W m^-2 for the whole haze period, while the aerosol radiative forcing at the top of the atmosphere varied from -4 to -98, -10 to -51, and -21 to -143 W m^-2 in Beijing, Shijiazhuang, and Jiaozuo, respectively. Satellite observations showed that smoke, polluted dust, and polluted continental components of aerosols may aggravate air pollution during haze episodes. The analysis of the potential source contribution function and concentration-weighted trajectory showed that the contribu- tion from local emissions and pollutants transport from upstream areas were 190-450 and 100-410 btg m-3, respectively.

关键词： haze episodes aerosols optical properties radiative forcing North China Plain

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华北地区一次霾过程中气溶胶垂直分布特征研究

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环境科学与技术 2016年第12期39卷 106-116页

作者：刘晨璇许潇锋孙恩伟南京信息工程大学中国气象局气溶胶与云降水重点开放实验室江苏南京210044

基于CALIOP/CALIPSO气溶胶廓线及类型产品,并综合AERONET产品、地面常规及探空资料和HYSPLIT后向轨迹模式,分析了华北地区2013年12月22-25日一次霾过程中气溶胶垂直分布特征及其成因。结果表明:低层存在均匀混合气溶胶消光层,层高及平... 详细信息

基于CALIOP/CALIPSO气溶胶廓线及类型产品,并综合AERONET产品、地面常规及探空资料和HYSPLIT后向轨迹模式,分析了华北地区2013年12月22-25日一次霾过程中气溶胶垂直分布特征及其成因。结果表明:低层存在均匀混合气溶胶消光层,层高及平均气溶胶消光系数(σ)霾日为0.481 km与0.766 km^(-1),无霾日为0.181 km与0.375 km^(-1),消光层之上σ呈指数衰减;500 m以下气溶胶光学厚度(AOD)对总AOD贡献霾日为47%,无霾日为36%;1 km以下,霾日体积退偏振比(VDR)与色比(CR)分别介于5%~15%与0.4~0.8,无霾日为15%~35%与0.6~1.0,霾日VDR与CR均值分别为13.883%与0.518,无霾日为26.371%与0.853。污染沙尘和烟尘为此次霾过程的主要气溶胶类型,本地排放及周边区域输送是此次霾过程中气溶胶的主要来源。小气压梯度、弱风速、高相对湿度及持续逆温层是导致此次霾事件的主要天气原因。

关键词：气溶胶霾消光系数体积退偏振比色比

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单斜相弛豫铁电单晶0.24PIN–0.43PMN–0.33PT的电光性能

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硅酸盐学报 2015年第11期43卷 1592-1596页

作者：陈春天张景云吴丰民贺训军杨彬孙恩伟曹文武哈尔滨理工大学应用科学学院哈尔滨150080 哈尔滨工业大学凝聚态科学与技术研究所哈尔滨150080

通过将三元体系单斜相结构弛豫铁电单晶铌铟镁酸铅–钛酸铅[Pb(In1/2Nb1/2)O3–Pb(Mg1/3Nb2/3)O3–Pb Ti O3(PIN–PMN–PT)]的准同型相界组分0.24PIN–0.43PMN–0.33PT单晶沿[011]c方向极化成准单畴态,研究了该单晶的电光性能。采用改进... 详细信息

通过将三元体系单斜相结构弛豫铁电单晶铌铟镁酸铅–钛酸铅[Pb(In1/2Nb1/2)O3–Pb(Mg1/3Nb2/3)O3–Pb Ti O3(PIN–PMN–PT)]的准同型相界组分0.24PIN–0.43PMN–0.33PT单晶沿[011]c方向极化成准单畴态,研究了该单晶的电光性能。采用改进的Mach-Zehnder干涉系统,选用波长为632.8nm激光对单晶的电光系数张量?13、?23和?33进行测量及分析。根据实验及计算结果,排除由压电效应引起晶体在通光方向的伸缩,电光系数张量?13=–21.8 pm/V,?23=64.7 pm/V,?33=85.8 pm/V。测试结果表明,单晶的电光系数具有较高的?23和?33分量,在实际的电光器件应用中,可以在保证单晶透过率的情况下对这两个分量进行利用。

关键词：铌铟镁酸铅钛酸铅铁电晶体电光系数单斜相准同型相界

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巨压电弛豫铁电单晶及其在医用超声换能器中的应用

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自然杂志 2017年第1期39卷 37-42页

作者：曹文武孙恩伟杨彬哈尔滨工业大学凝聚态科学与技术研究所

压电材料是一类非常重要的多功能材料。它可以实现机械能和电能之间的相互转换,在机电器件和电声领域有广泛的应用。基于宽频带超声波换能器、高灵敏度传感器和大应变执行器等压电器件的发展需求,迫切地需要研发出具有更大压电应变常数... 详细信息

压电材料是一类非常重要的多功能材料。它可以实现机械能和电能之间的相互转换,在机电器件和电声领域有广泛的应用。基于宽频带超声波换能器、高灵敏度传感器和大应变执行器等压电器件的发展需求,迫切地需要研发出具有更大压电应变常数和更高机电耦合系数的压电材料。弛豫铁电单晶铌镁酸铅-钛酸铅(化学分子式（1-x）Pb(Mg;Nb;)O;-xPbTiO;简称PMN-xPT或PMN-PT)及其同类单晶（简称弛豫铁电单晶）的发现恰逢其时,它们所具有的巨压电性和极高的机电耦合系数使得很多机电器件的性能有了一次大幅度的改进。例如:PMN-33%PT单晶的压电常数d;高达2800 pC/N,是通用的压电材料PZT压电陶瓷的5倍,其机电耦合系数k;也高达94%,而最好的PZT的机电耦合系数k;也只能达到70%。本文系统地介绍了弛豫铁电单晶材料及其在医用超声换能器方面的应用进展。

关键词：弛豫铁电单晶 PMN-PT 巨压电性医用超声换能器

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