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Enhanced piezoelectricity of Cu-doped K(Ta,Nb)O_(3) single crystals

Journal of Materiomics 2024年第5期10卷 1017-1025页

作者： Fulin Zhang Songtao Fan Yingxu Zhu Wendie Chen Bing Liu Yuguo Yang limei zheng Yuanyuan Zhang Xianshun Lv Xuping Wang Advanced Materials Institute Qilu University of Technology(Shandong Academy of Sciences)Jinan250014China Qilu University of Technology(Shandong Academy of Sciences) Advanced Materials InstituteKey Laboratory of Light Conversion Materials and Technology of Shandong Academy of SciencesJinan250014China School of Physics Shandong UniversityJinan250100China

As a class of solid solution material,K(Ta,Nb)O3(KTN)single crystals have attracted significant interest due to their excellent piezoelectric and electro-optic *** this study,the piezoelectric properties of KTN were improved through Cu *** the advantages of composition-regulating phase transition,a large,high-quality Cu:KTN crystal measuring 30 mm×25 mm×20 mm in size was grown using the improved top seeded solution growth ***-doped KTN exhibited better piezoelectric properties than pure KTN,and the full matrix parameters were *** dielectric,piezoelectric,and electromechanical coupling responses(ε^(T)_(11)-2,136,d_(33)∼303 pC/N,k_(t)∼0.515,and k33∼0.672)were successfully *** realize the optimized orientation of the piezoelectric properties,the orientation dependence of the single domain properties was investigated,and the mechanism of Cu doping to improve piezoelectric properties was *** found that 0.36%(in mass)Cu doped crystal consisted of A-site substitution,following ferroelectric and domain *** small ferroelectric domain sizes led to a large domain wall mobility rate and high domain wall density,which contributed to high piezoelectric *** work revealed the effect of A-position doping on piezoelectric properties and provided a theoretical and experimental foundation for the performance optimization of KTN-based materials.

关键词： Solid solution material Lead-free piezoelectric Enhanced piezoelectricity

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Enhanced electrical performance in CaBi_(4)Ti_(4)O_(15)ceramics through synergistic chemical doping and texture engineering

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Journal of Materiomics 2024年第2期10卷 471-479页

作者： Le Zhao Guohao Li Xiao Zhai Weijie Kuai Yuzhi Zhai Gang Tian Zhigang Gai Minglei Zhao Juan Du Hongjun Zhang limei zheng School of Information and Automation Engineering Qilu University of Technology(Shandong Academy of Sciences)Jinan250353China School of Physics State Key Laboratory of Crystal MaterialsShandong UniversityJinan250100China Center for Optics Research and Engineering(CORE) Key Laboratory of Laser and Infrared System of Ministry of EducationShandong UniversityQingdaoShandong266237China College of Materials Science and Engineering Liaocheng UniversityLiaocheng252059China Functional Materials and Acoustooptic Instruments Institute School of Instrumentation Science and EngineeringHarbin Institute of TechnologyHarbin150080China

High-temperature piezoelectric materials with excellent piezoelectricity,low dielectric loss and large resistivity are highly desired for many industrial sectors such as aerospace,aircraft and nuclear *** a synergistic design strategy combining microstructural texture and chemical doping is employed to optimize CaBi 4Ti 4O15(CBT)ceramics with bismuth layer *** textured microstructure with an orientation factor of 80%e82%has been successfully achieved by the spark plasma sintering ***,by doping MnO_(2),both advantages of hard doping and sintering aids are used to obtain the excellent electrical performance of d_(33)=27.3 pC/N,tandδ-0.1%,Q_(31)~2,307 and electrical re-sistivityρ~6.5×10^(10)Ω·*** to 600℃,the 0.2%(in mass)Mn doped CBT ceramics still exhibit high performance of d_(33)=26.4 pC/N,r~1.5×10^(6)Ω·cm and tandδ~15.8%,keeping at an applicable level,thus the upper-temperature limit for practical application of the CBT ceramics is greatly *** work paves a new way for developing and fabricating excellent high-temperature piezoelectric materials.

关键词： CaBi_(4)Ti_(4)O_(15) Piezoelectricity Mechanical quality factor Resistivity

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全面护理对癫痫患者睡眠质量的影响

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世界睡眠医学杂志 2024年第7期11卷 1543-1545页

作者：郑丽梅福建省龙岩市第二医院神经外科龙岩364000

目的:观察全面护理对癫痫患者睡眠质量的影响。方法:选取2022年6月至2023年6月福建省龙岩市第二医院神经外科收治的癫痫患者70例作为研究对象,按照随机数字表法分为对照组和观察组,每组35例。对照组采用常规护理,观察组采用全面护理,比... 详细信息

目的:观察全面护理对癫痫患者睡眠质量的影响。方法:选取2022年6月至2023年6月福建省龙岩市第二医院神经外科收治的癫痫患者70例作为研究对象,按照随机数字表法分为对照组和观察组,每组35例。对照组采用常规护理,观察组采用全面护理,比较2组患者护理后睡眠质量和心理状况。结果:护理后,2组睡眠时间、睡眠质量和睡眠效率评分均较本组护理前降低(P<0.05),且观察组均明显低于对照组(P<0.05)。护理后,2组焦虑自评量表(SAS)和抑郁自评量表(SDS)评分均较本组护理前降低(P<0.05),且观察组均明显低于对照组(P<0.05)。睡眠时间、睡眠质量及睡眠效率的恢复情况均较对照组显著(P<0.05);护理后观察组SAS、SDS恢复情况更好(P<0.05)。结论:全面护理可有效改善癫痫患者睡眠质量,还可缓解焦虑及抑郁的心情,使其保持良好的心态接受医治,值得推广。

关键词：癫痫整体护理睡眠质量焦虑抑郁

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Piezoelectric Properties of(Na0.5K0.5-xLix)NbO3 Ceramics

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Journal of Materials Science & Technology 2007年第6期23卷 833-836页

作者： Peng QI Jinfeng WANG Baoquan MING Juan DU Xinghua LIANG limei zheng School of Physics Shandong University Jinan 250100 China

Lead-free piezoelectric ceramics （Na0.5K0.5-xLix）NbO3 （x=0.057-0.066） were synthesized by an ordinary sin-tering technique. Substituting Li for K can lead to structural distortion, which improves the Curie temperature （To） greatly. By adding appropriate LiNbO3 content, piezoelectric constant d33 values reach 202-212 pC/N. Electromechanical coefficients of the planar mode reach 44.4%-46.8%. The dielectric loss is below 2.6%, which is much lower than reported （about 50%）. The To of （Na0.5K0.5-xLix）NbO3 （x=0.057-0.066） is in the range of 490-510℃, at least 70℃ higher than that of pure （Na0.5K0.5）NbO3 ceramics. The results show that （Na0.5K0.5-xLix）NbO3 ceramic is a kind of good lead-free high-temperature piezoelectric material.

关键词： Lead-free Piezoelectric Dielectric Morphotropic phase boundary

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Numerical manifold method for steady-state nonlinear heat conduction using Kirchhoff transformation

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Science China(Technological Sciences) 2024年第4期67卷 992-1006页

作者： ZHANG limei KONG Heng zheng Hong Key Laboratory of Urban Security and Disaster Engineering Ministry of EducationBeijing University of TechnologyBeijing 100124China Beijing Municipal Construction Co. Ltd.Beijing 100048China

The numerical manifold method(NMM)introduces the mathematical and physical cover to solve both continuum and discontinuum problems in a unified *** this study,the NMM for solving steady-state nonlinear heat conduction problems is presented,and heat conduction problems consider both convection and radiation boundary ***,the nonlinear governing equation of thermal conductivity,which is dependent on temperature,is transformed into the Laplace equation by introducing the Kirchhoff *** transformation reserves linearity of both the Dirichlet and the Neumann boundary conditions,but the Robin and radiation boundary conditions remain ***,the NMM is employed to solve the Laplace equation using a simple iteration procedure because the nonlinearity focuses on parts of the problem domain ***,the temperature field is retrieved through the inverse Kirchhoff *** examples are analyzed,demonstrating the advantages of the Kirchhoff transformation over the direct solution of nonlinear equations using the NewtonRaphson *** study provides a new method for calculating nonlinear heat conduction.

关键词： numerical manifold method nonlinear heat conduction temperature-dependent thermal conductivity Kirchhoff transformation convection and radiation boundary conditions

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多指标成分测定结合化学计量学评价金花消痤丸质量

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现代药物与临床 2024年第9期39卷 2269-2275页

作者：王军史学礼王蓉郑利梅倪恒雨董恒岳亳州市食品药品检验中心安徽亳州236800 亳州职业技术学院安徽亳州236800 淮南市食品药品检验中心安徽淮南232000

目的采用多指标成分测定结合化学计量学评价金花消痤丸的质量。方法采用HPLC法测定10批金花消痤丸中栀子苷、盐酸小檗碱、黄芩苷、汉黄芩苷、黄芩素、汉黄芩素、芦荟大黄素、大黄素、大黄酚、大黄素甲醚,结合聚类分析、主成分分析、... 详细信息

目的采用多指标成分测定结合化学计量学评价金花消痤丸的质量。方法采用HPLC法测定10批金花消痤丸中栀子苷、盐酸小檗碱、黄芩苷、汉黄芩苷、黄芩素、汉黄芩素、芦荟大黄素、大黄素、大黄酚、大黄素甲醚,结合聚类分析、主成分分析、正交偏最小二乘法-判别分析评价不同批次金花消痤丸样品的质量差异。结果 10批金花消痤丸样品分为两类,样品间差异不大,较类似。4个主成分的累计方差贡献率达到了83.201%。结论方法简单快捷,重复性好,精密度优良,结果较准确,可以为金花消痤丸的质量控制提供参考。

关键词：金花消痤丸栀子苷盐酸小檗碱黄芩苷汉黄芩苷黄芩素汉黄芩素芦荟大黄素大黄素大黄酚大黄素甲醚聚类分析主成分分析正交偏最小二乘法-判别分析

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Achieving a high energy storage density in Ag(Nb,Ta)O_(3) antiferroelectric films via nanograin engineering

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Journal of Advanced Ceramics 2023年第1期12卷 196-206页

作者： Hongbo CHENG Xiao ZHAI Jun OUYANG limei zheng Nengneng LUO Jinpeng LIU Hanfei ZHU Yingying WANG Lanxia HAO Kun WANG Institute of Advanced Energy Materials and Chemistry School of Chemistry and Chemical EngineeringQilu University of Technology(Shandong Academy of Sciences)Jinan 250353China College of Electronic and Optical Engineering Nanjing University of Posts and TelecommunicationsNanjing 210023China School of Physics Shandong UniversityJinan 250100China Guangxi Key Laboratory of Processing for Non-ferrous Metallic and Featured Materials School of ResourcesEnvironment and MaterialsCenter on Nanoenergy ResearchSchool of Physical Science and TechnologyGuangxi UniversityNanning 530004China Key Laboratory for Liquid-Solid Structure Evolution and Processing of Materials(Ministry of Education) School of Materials Science and EngineeringShandong UniversityJinan 250061China Jinan Cigarette Factory China Tobacco Shandong Industrial Co.Ltd.Jinan 250104China

Due to its lead-free composition and a unique double polarization hysteresis loop with a large maximum polarization(Pmax)and a small remnant polarization(Pr),AgNbO_(3)-based antiferroelectrics(AFEs)have attracted extensive research interest for electric energy storage ***,a low dielectric breakdown field(Eb)limits an energy density and its further *** this work,a highly efficient method was proposed to fabricate high-energy-density Ag(Nb,Ta)O_(3) capacitor films on Si substrates,using a two-step process combining radio frequency(RF)-magnetron sputtering at 450℃and post-deposition rapid thermal annealing(RTA).The RTA process at 700℃led to sufficient crystallization of nanograins in the film,hindering their lateral growth by employing short annealing time of 5 *** obtained Ag(Nb,Ta)O_(3) films showed an average grain size(D)of~14 nm(obtained by Debye-Scherrer formula)and a slender room temperature(RT)polarization-electric field(P-E)loop(Pr≈3.8 mC·cm^(−2) and P_(max)≈38 mC·cm^(−2) under an electric field of~3.3 MV·cm^(−1)),the P-E loop corresponding to a high recoverable energy density(W_(rec))of~46.4 J·cm^(−3) and an energy efficiency(η)of~80.3%.Additionally,by analyzing temperature-dependent dielectric property of the film,a significant downshift of the diffused phase transition temperature(T_(M2-M3))was revealed,which indicated the existence of a stable relaxor-like AFE phase near the *** downshift of the T_(M2-M3) could be attributed to a nanograin size and residual tensile strain of the film,and it led to excellent temperature stability(20-240℃)of the energy storage performance of the *** results indicate that the Ag(Nb,Ta)O_(3) film is a promising candidate for electrical energy storage applications.

关键词： antiferroelectrics(AFE) AgNbO_(3) Ag(Nb Ta)O_(3) energy storage film capacitors nanograin engineering

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Lead-bismuth-free piezoceramics (Na_(0.5)K_(0.44)Li_(0.06))Nb_(0.95)Sb_(0.05)O_3-Na_(5.6)Cu_(1.2)Sb_(10)O_(29)

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Chinese Science Bulletin 2007年第4期52卷 566-569页

作者： zheng limei WANG JinFeng ZANG GuoZhong ZHAO MingLei QI Peng DU Juan SU WenBin MING BaoQuan School of Physics and Microelectronics State Key Laboratory of Crystal Materials Shandong University Ji'nan 250100 China

Newly developed sintering aid Na5.6Cu1.2Sb10O29 (NCS) and lead-bismuth-free piezoceramics (Na0.5K0.44Li0.06) Nb0.95Sb0.05O3 (NKLNS) were prepared by the conventional solid state reaction. The effects of sintering aid NCS on the electrical properties of NKLNS were investigated. It was found that the addition of a proper amount of sintering aid NCS to NKLNS is effective not only on improving the density and the piezoelectric activity, but also on reducing the dielectric loss of NKLNS. The NKLNS doped with 0.4 mol% NCS has a piezoelectric constant d33 as high as 261pC/N and an electromechanical coupling factor k33 above 60%. These results show that NCS-doped NKLNS is a promising and practicable candidate for lead-bismuth-free piezoceramics.

关键词：无铅无铋压电陶瓷相变铌酸盐钽酸盐

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Homogenous Sn-doped K(Ta,Nb)O_(3) single crystals and its high piezoelectric response

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Journal of Materiomics 2022年第3期8卷 702-709页

作者： Fengying Liu Yuanyuan Zhang limei zheng Gang Tian Juan Du Le Zhao Xudong Chen Xuping Wang Minglei Zhao School of Physics Shandong UniversityJinan250100China Advanced Materials Institute Qilu University of Technology(Shandong Academy of Sciences)Jinan250014China College of Materials Science and Engineering Liaocheng UniversityLiaocheng252059China School of Electronic and Information Engineering Department of Physics Qilu University of Technology(Shandong Academy of Sciences)JinanShandong250353China

Perovskite K(Ta,Nb)O_(3)(KTN)single crystal has drawn great interests for its outstanding electro-optic performance and excellent piezoelectric ***,growth of compositionally uniform KTN single crystals has always been a great challenge for the great segregation difference between Nb and *** this work,we propose a thermal field optimization strategy to resolve this *** Sn doped KTN(Sn:KTN)single crystal with significantly reduced composition gradient(0.003 mol/mm,1/4 e1/8 of other KTN system),minimal TC variation(13℃)and excellent piezoelectric and dielectric response(d_(33)=373 pC/N andε^(T)_(33)=5206)has been successfully *** found that the functional properties of Sn:KTN were greatly affected by the near-room temperature tetragonal-cubic phase *** the intrinsic aspect,longitudinal lattice deformation becomes much easier,resulting in maximum piezoelectric(d^(*)_(33)),dielectric(ε^(T*)_(33)),elastic(s^(E*)_(33))and electromechanical coupling(k^(*)_(33))coefficients along polar direction[001]_(C).From the extrinsic aspect,both domain wall density and domain wall mobility are greatly improved for the reduced lattice distortion,which also contribute a lot to the functional *** work provides a simple and practical route for designing and growing high quality crystals,and more importantly,reveals the fundamental mechanism of the phase transitions/boundaries on the functional properties.

关键词： Low composition gradient High piezoelectric response PS extension/contraction T-C phase transition Sn:KTN

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居家糖尿病患者胰岛素注射相关锐器废物安全处置管理方案的构建

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现代临床护理 2024年第1期23卷 70-77页

作者：张雯杰诸海英葛娟韩玉琴郑丽妹黎瑞红南方医科大学护理学院广东广州510515 上海市奉贤区中心医院上海201499 上海中医药大学上海201210 上海市徐汇区中心医院上海200031

目的构建居家糖尿病患者的胰岛素注射相关锐器废物的安全处置管理方案,为规范管理胰岛素注射相关锐器废物提供参考。方法以信息-动机-行为技巧模型(information-motivation-behavioural skills model,IMB)作为理论框架,检索国内外相... 详细信息

目的构建居家糖尿病患者的胰岛素注射相关锐器废物的安全处置管理方案,为规范管理胰岛素注射相关锐器废物提供参考。方法以信息-动机-行为技巧模型(information-motivation-behavioural skills model,IMB)作为理论框架,检索国内外相关文献,并通过半结构式访谈整合患者的认知及需求,拟定胰岛素注射废弃相关锐器废物的安全处置管理方案初稿。采用德尔菲法开展了2轮专家函询,制订了胰岛素注射相关锐器废物的安全处置管理方案。结果 2轮专家函询问卷的有效回收率分别为88.89%和93.75%,专家权威系数均为0.93。第2轮函询中,各级条目的重要性赋值均数为4.40~5.00分,变异系数范围为0~0.168。最终建立了包含3个一级条目、6个二级条目和20个三级条目的管理方案。结论从信息-动机-行为技巧方面构建的胰岛素注射相关锐器废物的安全处置管理方案具有良好的科学性和实用性,能够为医护人员的临床实践提供参考。

关键词：糖尿病胰岛素注射锐器信息-动机-行为技巧模型德尔菲法

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