检索结果-南通市图书馆

NaNbO_(3) modified BiScO_(3)-BaTiO_(3) dielectrics for high-temperature energy storage applications

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Materiomics 2022年第4期8卷 731-738页

作者： Jincymol Joseph zhenxiang cheng Shujun Zhang Institute of Superconducting and Electronic Materials Australian Institute of Innovative MaterialsUniversity of WollongongNSW2500Australia

Among the lead-free compositions identified as potential capacitor materials, BiScO_(3)-BaTiO_(3) (BS-BT)relaxor dielectrics exhibit good energy storage performance. In this research, 0.4BS-0.6BT is consideredas the parent composition, with NaNbO_(3) (NN) addition intended to substitute the A and B site *** NN modified BS-BT ceramics exhibit excellent temperature stability in terms of their dielectricproperties, with the room-temperature dielectric constant on the order of 500e1 000 and variation lessthan 10% up to 400 C. In addition, NN has a high band-gap energy leading to increased breakdownstrength and energy storage properties in modified compositions. The highest breakdown strength wasachieved for 0.4BS-0.55BT-0.05NN, being on the order of 430 kV/cm, and a high energy density of 4.6 J/cm3 with high energy efficiency of 90% was simultaneously achieved. Of particular importance is that thevariation of the energy density was below 5% due to the temperature-insensitive dielectric constant,while ~90% energy efficiency was retained over the temperature range of 25e160 C. The improvedtemperature stability with NN addition makes this composition promising for high temperaturecapacitor and dielectric energy storage applications.

关键词： Relaxor ferroelectrics Lead-free Energy storage Temperature stability

Simultaneously enhanced energy storage performance and luminance resistance in (K_(0.5)Na_(0.5))NbO_(3) -based ceramics via synergistic optimization strategy

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Advanced Ceramics 2024年第1期13卷 34-43页

作者： Yu Huan Diyu Gui Changxiao Li Tao Wei Lingzhi Wu Xinjian Wang Xiaozhi Wang zhenxiang cheng School of Materials Science and Engineering University of JinanJinan 250022China Yangtze Delta Region Transformation Center for Advanced Technological Achievements Suzhou 215000China Electronic Materials Research Laboratory Key Laboratory of the Ministry of Education and International Center for Dielectric ResearchXi’an Jiaotong UniversityXi’an 710032China Institute for Superconducting and Electronic Materials Australian Institute for Innovative MaterialsUniversity of WollongongInnovation CampusNorth Wollongong 2500Australia

The rapidly advancing energy storage performance of dielectric ceramics capacitors has garnered significant interest for applications in fast charge/discharge and high-power electronic *** the exceptional electrical properties in harsh environments can further promote their practical *** carriers can be excited under luminance irradiation,thereby leading to degradation of energy storage ***,a synergic optimization strategy is proposed to enhance energy storage properties and luminance resistance of(K_(0.5)Na_(0.5))NbO_(3)-base(KNN)***,the introduction of Bi(Zn0.5Ti0.5)O_(3) solid solution and La3+ions disrupts the long-range polar orders and enhances super paraelectric relaxation ***,doping La3+ions can increase the band gap and reduce oxygen vacancy concentration,resulting in excellent luminance ***,the viscous polymer process is employed to suppress the grain growth and promote chemical *** a result,ultrahigh recoverable energy storage density(Wrec)of 8.11 J/cm3 and high efficiency(η)of 80.98%are achieved under an electric field of 568 kV/***,the variations in Wrec andηare only 12.45%and 1.75%,respectively,under 500 W xenon lamp irradiation compared to the performance under a dark *** findings hold great potential in facilitating the practical application of dielectric ceramic capacitors in luminance irradiation environments.

关键词： potassium-sodium niobate energy storage performance illumination resistance oxygen vacancy viscous polymer processing

LaBr_(2)bilayer multiferroic moirésuperlattice with robust magnetoelectric coupling and magnetic bimerons

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

npj Computational Materials 2022年第1期8卷 1515-1523页

作者： Wei Sun Wenxuan Wang Hang Li Xiaoning Li Zheyin Yu Ying Bai Guangbiao Zhang zhenxiang cheng International Joint Research Laboratory of New Energy Materials and Devices of Henan Province School of Physics and ElectronicsHenan UniversityKaifeng475004P.R.China Institute for Superconducting&Electronic Materials Australian Institute of Innovative MaterialsUniversity of WollongongInnovation CampusSquires WayNorth WollongongNSW2500Australia

Two-dimensional(2D)van der Waals(vdW)materials provide the versatile playground to stack two or more vdW layers for creation of superior materials with desired *** we theoretically adopt a twisted stack-engineering of two LaBr_(2)monolayers to break space inversion symmetry for ferroelectricity and ultimately *** enhancement and reversal of electric polarization are accompanied with the transition from interlayer ferromagnetic and antiferromagnetic orderings,demonstrating an effective magnetoelectric coupling effect with a mechanism dissimilar to that of the conventional *** dynamics simulations show that such magnetic phase transition can excite topologically protected bimeron,and the skyrmion Hall effect can be suppressed by bilayer-bimeron stabilized in both ferromagnetic and antiferromagnetic ***,in the small-angle twisted moirésuperlattice,the uniform polarization will evolve into a staggered domain structure,accompanied with the appearance of bimeron,which forms a significant discrepancy with the non-twisted stack-engineered multiferroic LaBr_(2)*** work provides a strategy for 2D multiferroic materials by twisted stack engineering of magnetic single layers.

关键词： twisted coupling superlattice

Large electrostrain in Bi_(1/2)Na_(1/2)TiO_(3)-based relaxor ferroelectrics:A case study of Bi_(1/2)Na_(1/2)TiO3-Bi_(1/2)K_(1/2)TiO_(3)-Bi(Ni_(2/3)Nb_(1/3))O_(3) ceramics

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Materiomics 2021年第3期7卷 593-602页

作者： Guangzhi Dong Huiqing Fan Laijun Liu Pengrong Ren zhenxiang cheng Shujun Zhang State Key Laboratory of Solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an710072China Institute for Superconducting and Electronic Materials Australia Institute of Innovative MaterialsUniversity of WollongongWollongong2522Australia College of Materials Science and Engineering Guilin University of TechnologyGuilin541004China Shaanxi Province Key Laboratory for Electrical Materials and Infiltration Technology School of Materials Science and EngineeringXi’an University of TechnologyXi’an710048China

(1-x)(0.8Bi_(1/2)Na_(1/2)TiO3-0.2Bi_(1/2)K_(1/2)TiO3)-xBi(Ni_(2/3)Nb_(1/3))O3(BNKT-xBNN)solid solution ceramics were fabricated by high temperature solid-state reaction *** the compositions possess relaxor ferroelectric features,among which the ergodic BNKT-0.02BNN exhibits large repeatable electrostrain value Suni¼0.51%at electric field of 65 kV/cm,with high piezoelectric stain coefficient d33*of 890 pm/V at 45 kV/cm,while the non-ergodic compositions present unrepeatable large strain *** on the electric field-composition phase diagram,the repeatability of strain response in ergodic compositions can be attributed to the reversible electric-field-induced phase *** addition,the effects of BNN contents on the macroscopic strain properties are explored by analyzing the existing states of the polar regions with corresponding thermal evolutions and electric-field-induced phase *** research is expected to guide the design of lead free relaxor ferroelectric materials with desired electrostrain properties.

关键词： BNT Electrostrain Mechanism Lead free Relaxor ferroelectric Phase diagrams

Flexible lead-free BFO-based dielectric capacitor with large energy density,superior thermal stability,and reliable bending endurance

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Materiomics 2020年第1期6卷 200-208页

作者： Changhong Yang Jin Qian Panpan Lv Haitao Wu Xiujuan Lin Kun Wang Jun Ouyang Shifeng Huang Xin cheng zhenxiang cheng Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials University of JinanJinan250022China School of Materials Science and Engineering University of JinanJinan250022China Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials(Ministry of Education) School of Materials Science and EngineeringShandong UniversityJinan250061China Institute for Superconducting and Electronic Materials Australian Institute for Innovative MaterialsUniversity of WollongongInnovation CampusNorth WollongongNSW2500Australia

As an essential energy-stored device,the inorganic dielectric film capacitor plays an irreplaceable role in high-energy pulse power technology *** this work,propelled by the challenge of overcoming the bottlenecks of inflexibility and inferior energy storage density of the pure BiFeO3 films,the mica with high bendability and thermal stability is adopted as substrate,and the relaxor ferroelectric(Sr_(0.7)Bi_(0.2))TiO_(3) is introduced to form solid solution to introduce relaxor *** subsequently fabricated 0.3Bi(Fe_(0.95)Mn_(0.05))O_(3)-0.7(Sr_(0.7)Bi_(0.2))TiO_(3)(BFMO-SBT)thin film capacitor exhibits a high recoverable energy storage density(W_(rec)=61 J cm^(-3))and a high efficiency(η=75%)combined with a fast discharging rate(23.5 μs)due to the large polarization difference(ΔP=59.4 μC cm^(-2)),high breakdown strength(E_(b)=3000 kV cm^(-1)),and the strong relaxor dispersion(γ=1.78).Of particular importance is the capacitor presents excellent stability of energy storage performance,including a wide working temperature window of -50-200℃,fatigue endurance of 108 cycles,and frequency range of 500 Hz-20 ***,there are no obviously deteriorations on energy storage capability under various bending states and after 104 times of mechanical bending *** these results indicate that BFMO-SBT on mica film capacitor has potential application in the future flexible electronics.

关键词： Flexible BiFeO_(3)film Energy storage performance Wide temperature range Bending-endurance

Temperature dependent terahertz giant anisotropy and cycloidal spin wave modes in BiFeO3 single crystal

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2020年第7期29卷 135-140页

作者： Fan Liu Zuanming Jin Xiumei Liu Yuqing Fang Jiajia Guo Yan Peng zhenxiang cheng Guohong Ma Yiming Zhu Shanghai Key Laboratory of Modern Optical System and Engineering Research Center of Optical Instrument and System(Ministry of Education)University of Shanghai for Science and TechnologyShanghai 200093China Department of Physics Shanghai UniversityShanghai 200444China Institute for Superconducting and Electronic Materials University of WollongongNSWAustralia SIOM&STU Joint Laboratory for Superintense Lasers and the Applications Shanghai 201210China Shanghai Institute of Intelligent Science and Technology Tongji UniversityShanghai 200092China

THz time-domain spectroscopy(THz-TDS)is used to study the THz-optical properties of a single crystal bismuth ferrite BiFeO3(BFO).It can be found that the anisotropy of BiFeO3 is strongly dependent on the temperature.A giant birefringence up to around 3.6 is observed at 1 *** presence of a spatially modulated cycloidal antiferromagnetic structure leads to spin cycloid resonances(SCR)ψandΦ,corresponding to the out-of-plane and in-plane modes of the spin cycloid,*** distinguish the SCR with respect to their response to orthogonal polarizations of the electric fields of the incident THz *** addition,we observe a resonance appearing below 140 K,which might be interpreted as an electromagnon mode and related to a spin reorientation *** present observations present that the temperature and polarization,as the external control parameters,can be used to modulate the THz optical properties of BFO single crystal.

关键词： time resolved terahertz spectroscopy dielectric anisotropy spin cycloid resonance

维普期刊数据库

Growth, structure and upconversion mechanisms of Ba_2ErCl_7 crystal

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2000年第11期45卷 981-984页

作者： HAN Jianru, ZHOU Guangyong, ZHANG Shujun, cheng zhenxiang & CHEN HuanchuState Key Laboratory of Crystal Materials, Institute of Crystal Materials of Shandong University, Jinan 250100, China Stale Key Laboratory of Crystal Materials Institute of Crystal Materials of Shandong University Jinan China

The methods to grow a novel upconversion crystal Ba2ErCI7 are reported in this note. Ba2ErCI7 material was synthesized with Er2O3, BaCI2-2H2O and NH4CI by using a so-called "direct synthesis method". High quality Ba2ErCI7 single crystals with size up to 4 mm×8 mm×15 mm were grown by using the Czochralski and the Bridgman methods. Intense yellow-green luminescence was detected when the crystal was pumped by an 803 laser diode (LD). Transmittance spectrum was measured by using HITACH U-3500 spectrophotometer at room temperature for the first time, in which one can see that the transmittance is high in the range from 350 to 1 600 nm and the cut-off wavelength of the crystal was 230 nm. The upconversion mechanisms were discussed.

关键词： Ba2ErCl2 single crystal growth transmittance spectra upconversion mechanisms.

维普期刊数据库

Effect of Nd3+ Concentration on theLaser Performance of a New Laser Crystal: Nd: NaY（WO4）_ 2

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Lasers 2002年第2期 47-50页

作者： FU Kun WANG Zhengping cheng zhenxiang LIU JunhaiSONG Renbo CHEN Huanchu SHAO Zongshu ( State Key Laboratory of Crystal Material, Shandong University, Jinan 250100, China)

The transmission and emission spectra of a new crystal, Nd:NaY(WO4)2(Nd:NYW) have been measured. Using a Ti: Sapphire laser as the pump source, the laser performances of Nd: NYW crystals with different concentrations are compared for the first time. The Nd3+ concentrations used are 1, 2, 4 and 5 at.-% . The experiments show that 2 at.-% is the optimum concentration. When the incident pump power is 575 mW, the 1. 06 μm output can reach 184 mW, corresponding to an optical to optical efficiency of 32 % . The experimental results show that the work is significant to the further research and praction application of this promising laser crystal.

关键词： Nd:NaY(WO4)2 crystal absorption and emission property Nd3+ concentration

Metastable oxygen vacancy ordering state and improved memristive behavior in TiO2 crystals

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science Bulletin 2020年第8期65卷 631-639,M0003,M0004页

作者： Tianyu Li Fang Hong Ke Yang Binbin Yue Nobumichi Tamura Hua Wu zhenxiang cheng Chunchang Wang Laboratory of Dielectric Functional Materials School of Physics&Material ScienceAnhui UniversityHefei 230601China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Advanced Liight Source Lawrence Berkeley National LaboratoryBerkeleyCA 94720USA Laboratory for Computational Physical Sciences(Ministry of Education) State Key Laboratory of Surface PhysicsDepartment of PhysicsFudan UniversityShanghai 200433China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093China Institute for Superconducting and Electronic Materials University of WollongongSquires WayNorth WollongongNSW 2500Australia State Key Laboratory of Low-Dimensional Quantum Physics.Department of Physics Tsinghua University.Beijing 100084China

Oxygen vacancy is one of the pivotal factors for tuning/creating various oxide *** the behavior of oxygen vacancies is of paramount *** this study,we identify a metastable oxygen vacancy ordering state other than the well-known Magnéli phases in TiO2 crystals from both experimental and theoretical *** oxygen vacancy ordering is found to be a zigzag chain along the[001]direction in the(110)plane occurring in a wide temperature range of 200–500℃.This metastable ordering state leads to a first-order phase transition accompanied by significant enhancement of dielectric permittivity and a memristive effect featuring a low driving electric *** results can improve oxide properties by engineering oxygen vacancies.

关键词： TiO2 single crystal Oxygen vacancy ordering Phase transition Memristive effect

维普期刊数据库