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Super-stable permittivity and low dielectric loss of(1-x)Na_(0.5)Bi_(0.5+y)TiO_(3-x)NaTaO_(3)ceramics within an ultra-wide temperature range

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Journal of Materiomics 2023年第3期9卷 482-491页

作者： Pengrong Ren Han Zhao Xin Wang Yuhui Wan Zhiyong Liu Changbai Long Fuxue Yan Till Frӧmling Gaoyang Zhao Shaanxi Province Key Laboratory for Electrical Materials and Infiltration Technology School of Materials Science and EngineeringXi'an University of TechnologyXi'an710048China Laboratory of Thin Film Techniques and Optical Test School of Photoelectrical EngineeringXi'an Technological UniversityXi'an710032China School of Materials Science and Engineering Nanchang Hangkong UniversityNanchang330063China State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong UniversityXi'an710049China Institute of Materials Science Technische Universit€at DarmstadtFB Nichtmetallisch-Anorganische WerkstoffeAlarich-Weiss-Straße 2D-64287DarmstadtGermany

This work designs a new system(1-x)Na_(0.5)Bi_(0.5+y)TiO_(3-x)NaTaO_(3)with a nonstoichiometric bismuth ratio,which is used as dielectrics of ceramics *** structure evolution of(1-x)Na_(0.5)Bi_(0.5+y)TiO_(3-x)NaTaO_(3)is characterized using XRD,Raman and *** and resistant properties of(1-x)Na_(0.5)Bi_(0.5+y)TiO_(3-x)NaTaO_(3)are investigated with increasing concentration of NaTaO_(3).With these in-vestigations,the structure and defect chemistry of(1-x)Na_(0.5)Bi_(0.5+y)TiO_(3-x)NaTaO_(3)are rationalized and their respective impact on capacitor properties are *** optimized composition 0.8Na_(0.5)Bi_(0.51)TiO_(3)-0.2NaTaO_(3)possesses an ultra-wide operating temperature range(-92e398C),in which both stable permittivity and low dielectric loss is ***,the fabrication of multilayer ceramics capacitors(MLCC)based on 0.8Na_(0.5)Bi_(0.51)TiO_(3)-0.2NaTaO_(3)dielectrics is *** the addition of sintering aids,0.8Na_(0.5)Bi_(0.51)TiO_(3)-0.2NaTaO_(3)could be co-fired with Ag at 910℃in air,and the low temperature co-fired ceramic(LTCC)capacitors maintain good temperature stability of permittivity and low dielectric loss in-100-352℃.Therefore,our work provides a new route for pre-paring ultra-wide operating temperature capacitors at low manufacturing costs.

关键词： Na_(1/2)Bi_(1/2)TiO_(3) Permittivity Dielectric loss Ultra-wide operating temperature capacitors

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Design and analysis of quantized controllable doped left-handed materials

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The Journal of China Universities of Posts and Telecommunications 2011年第3期18卷 99-104页

作者： LIU Wen ZHANG Hong-xin WANG Hong LU Ying-hua CHEN Nan MEN Shuo School of Electronic Engineering Beijing University of Posts and Telecommunications Beijing 100876 China Beijing National Railway Research and Design Institute of Signal and Communication Beijing 100073 China College of Electronic Information and Automation Chongqing University of Technology Chongqing 400054 China

Two kinds of controllable doped left-handed materials （DLHMs） were designed by inserting inductors and capacitors into the traditional left-handed material （LHM） as heterogeneous elements respectively, which are DLHM with inductors （LDLHM） and DLHM with capacitors （CDLHM）. The characteristics of transmission spectrum were studied by using finite-difference time-domain method （FDTD）. Compared with the traditional LHM, the resonance strength of the LDLHM is weakened and the pass-band is narrowed, but with the increase of the value of the inserted inductors, the bandwidth is expanded. As capacitors inserted into the LHM, the pass-band of the CDLHM is expanded, but the pass-band is shifted to low frequency and the bandwidth is narrowed with the increase of the value of the capacitors, meanwhile, a new generated pass-band is also shifted to low frequency. Therefore, a quantized controllable doped left-handed material can be achieved.

关键词： electromagnetics left-handed material pass-band capacitors inductors

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Regulating energy storage performances of 0.85NaNbO_(3)-0.15Bi(Zn_(2/3)Nb_(1/3))O_(3) ceramics using BaTiO_(3)

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Journal of Materiomics 2022年第1期8卷 166-173页

作者： Dongyu Lai Zhonghua Yao Wei You Biao Gao Qinghu Guo Ping Lu Amjad Ullah Hua Hao Minghe Cao Hanxing Liu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Material Science and EngineeringWuhan University of TechnologyWuhan430070China International School of Material Science and Engineering Wuhan University of TechnologyWuhan430070China

Recently,NaNbO_(3)-based ceramics with excellent energy storage performances(ESPs)and fast chargedischarge characteristics have attracted great *** this case,BaTiO_(3) modified 0.85NaNbO_(3)-0.15Bi(Zn_(2/3)Nb_(1/3))O_(3)(0.85NN-0.15BZN-yBT)ceramics were designed and successfully fabricated using solid state *** discharge storage density of the ceramics increases from 1.22 J/cm^(3) at y=0-1.84 J/cm^(3) at y=8%,which is 1.5 times higher than pure 0.85NN-0.15BZN *** ceramic reveals excellent temperature stability up to 150℃,good discharge cycling after 10^(5) cycles and high discharge speed of 2.0μs,broadening the scope of NaNbO_(3)-based ceramics for energy storage applications.

关键词： Perovskites Ceramics Dielectric properties Energy storage capacitors

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Analysis of Capacitance Characteristics of Light-Controlled Electrostatic Conversion Device

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Chinese Journal of Electronics 2023年第2期32卷 389-396页

作者： LIU Yujie WANG Yang JIN Xiangliang PENG Yan LUO Jun YANG Jun School of Physics and Electronics Hunan Normal University School of Mechatronic Engineering and Automation Shanghai University University of Electronic Science and Technology

In recent years, converting environmental energy into electrical energy to meet the needs of modern society for clean and sustainable energy has become a research hotspot. Electrostatic energy is a pollution-free environmental energy source. The use of electrostatic conversion devices to convert electrostatic energy into electrical energy has been proven to be a feasible solution to meet sustainable development. This paper proposes a light-controlled electrostatic conversion device(LCECD).When static electricity comes, an avalanche breakdown occurs inside the LCECD and a low resistance path is generated to clamp the voltage, thereby outputting a smooth square wave of voltage and current. Experiments have proved that LCECD can convert 30k V electrostatic pulses into usable electrical energy for the normal operation of the back-end light-emitting diode lights. In addition, the LCECD will change the parasitic capacitance after being exposed to light. For different wavelengths of light, the parasitic capacitance exhibited by the device will also be different. The smaller the parasitic capacitance of the LCECD, the higher the efficiency of its electrostatic conversion. This is of great significance to the design of electrostatic conversion devices in the future.

关键词： Resistance Breakdown voltage Wavelength measurement Electrostatic measurements capacitors Lighting Clamps

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A Novel Wideband Wilkinson Pulse Combiner with Enhanced Low Frequency Isolation

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Chinese Journal of Electronics 2023年第4期32卷 683-691页

作者： WANG Zitong WU Qi SU Donglin The School of Electronic and Information Engineering Beihang University

In this paper, a novel Wilkinson pulse combiner(WPC) is proposed for the combination of Gaussian pulse signals. The WPC requires a very wide bandwidth, small size and high port isolation. To improve the operating bandwidth, the design adopts the form of eight-section WPC. Eight capacitors are connected in series with the isolating resistors of each *** capacitive loading, isolation between WPC input ports is significantly improved at low frequency. Consequently, the operating bandwidth of WPC has been increased from 13:1 to 31:1. Compared with the conventional Wilkinson combiner with the same bandwidth, the proposed WPC reduces the size by 40%. In addition, all the ports are well impedance matched and the insertion loss in the operating frequency band is less than 0.5 dB. To verify the feasibility of the design, a prototype was fabricated and measured. Experiment shows that the novel WPC is more advantageous to generate dual-Gaussian pulse signals.

关键词： Resistors Current measurement Loading capacitors Prototypes Insertion loss Capacitance

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BiFeO_(3)-BaTiO_(3):A new generation of lead-free electroceramics

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Journal of Advanced Dielectrics 2018年第6期8卷 8-42页

作者： Dawei Wang Ge Wang Shunsuke Murakami Zhongming Fan Antonio Feteira Di Zhou Shikuan Sun Quanliang Zhao Ian M.Reaney Department of Materials Science and Engineering University of Sheffield Sheffield S13JDUK Department of Materials Science and Engineering Iowa State University AmesIowa 50011USA Christian Doppler Laboratory for Advanced Ferroic Oxides Sheffield Hallam University Sheffield S11WBUK Electronic Materials Research Laboratory Key Laboratory of the Ministry of Education&International Center for Dielectric Research Xi’an Jiaotong University Xi’an 710049ShaanxiP.R.China School of Mechanical and Materials Engineering North China University of Technology Beijing 100144 P.R.China

Lead-based electroceramics such as Pb(***)O_(3)(PZT)and its derivatives have excellent piezoelectric,pyroelectric and energy storage properties and can be used in a wide range of *** lead-free replacements for PZT such as potassium sodium niobate(KNN)and sodium bismuth titanate(NBT)have a much more limited range of useful properties and have been optimized primarily for piezoelectric ***,we review the initial results on a new generation of lead-free electroceramics based on BiFeO_(3)-BaTiO_(3)(BF-BT)highlighting the essential crystal chemistry that permits a wide range of functional *** demonstrate that with the appropriate dopants and heat treatment,BF-BT can be used to fabricate commercially viable ceramics for applications,ranging from sensors,multilayer actuators,capacitors and high-density energy storage *** also assess the potential of BF-BT-based ceramics for electrocaloric and pyroelectric applications.

关键词： BiFeO_(3)-BaTiO_(3) lead-free piezoelectrics energy storage dielectrics capacitors

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Impedance spectra of different capacitor technologies

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Journal of Advanced Dielectrics 2023年第4期13卷 76-87页

作者： Rene Kalbitz W€urth Elektronikei Sos GmbH Headquarters Max-Eyth-Straße 1Waldenburg 74638Germany Product Unit capacitors&Resistors Competence Center Berlin Volmerstraße 10Berlin 12489Germany

This paper reviews the interpretation of impedance and capacitance spectra for different capacitor technologies and discusses how basic electrical characteristics can be inferred from *** basis of the interpretation is the equivalent circuit for *** is demonstrated how the model parameters,such as capacitance and equivalent series resistance,can be extracted from the measured *** aspects of measurement accuracy are exemplarily discussed on the measured spectra.

关键词： Impedance capacitance spectra capacitors equivalent circuit equivalent series resistance measurement accuracy

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Analysis and Design of Makowski Charge-Pump Cell

Analysis and Design of Makowski Charge-Pump Cell

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2005 6th International Conference on ASIC

作者： Lifang Liu Zhiliang Chen Institute of Microelectronics Tsinghua University

ISBN: (纸本)0780392108;9780780392106;0780392108;9780780392106

＜正＞In designing a charge pump cell,selection of switching frequency and component sizes is usually a *** have been some discussions about Dickson charge pump and most of them considered the frequency and component sizes *** this paper,a new and generalized method for the analysis and design of Makowski charge pump is presented. Switching frequency and component sizes are considered as a *** loss and power loss are presented in *** and switching losses are evaluated to achieve design optimization in terms of switching frequency and component *** designs and simulations are performed to prove the validity and accuracy of the theoretical analysis and *** shows that the switching frequency and the component sizes obtained from the analysis give us near-optimal power efficiency.A 6 or 8 times Makowski charge pump cell is also designed based on our theory.

关键词： Charge pumps Voltage Switching frequency capacitors Switches Steady-state Design optimization DC-DC power converters Design methodology Microelectronics

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On-Chip Boost DC-DC Converter in Color OLED Driver & Controller ICs for Mobile Application

On-Chip Boost DC-DC Converter in Color OLED Driver & Control...

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2005 6th International Conference on ASIC

作者： Ding Ge Zhiliang Chen Institute of Microelectronics Tsinghua University

ISBN: (纸本)0780392108;9780780392106;0780392108;9780780392106

On-chip boost DC-DC converter used in color OLED driver & controller ICs for mobile application is presented in this *** special systematic requirement,current-limited pulse-frequency modulation (PFM) control scheme is *** converter is designed with 0.35um 1P4M high-voltage CMOS process. Experimental results show that,the converter can operate with supply voltage from 2.5 to 4.2V,which is suitable for single-cell lithium-ion rechargeable battery supply application,and boost voltage up to 12～18V for illumining OLED display *** output ripple voltage is about 250mV with 6.8μF off-chip capacitor and 10μH off-chip *** power efficiency is over 75%for 100mA load current,maximum to 87%at about 200mA load current.

关键词： DC-DC power converters Organic light emitting diodes Voltage Pulse modulation Control systems CMOS process Batteries Flat panel displays capacitors Inductors

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Optimal Sizing of Capacitor Bank for Increasing Substation Capacity of Mamou

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World Journal of Engineering and Technology 2023年第2期11卷 217-233页

作者： Jean Ouèrè Toupouvogui Mohamed Ansoumane Camara Ansoumane Sakouvogui Mamby Keita Department of Instrumentation and Physical Measurements Higher Institute of Technology Mamou Guinea Electrical Engineering Department Polytechnic Institute Gamal Abdel Nasser University Conakry Guinea Energy Department Higher Institute of Technology Mamou Guinea Department of Physics Faculty of Sciences Gamal Abdel Nasser University Conakry Guinea

In order to increase the available power of the electrical energy distribution station and improve the voltage profile of the distribution lines, the use of shunt capacitor banks is indicated. The main results obtained during this study are: a reduction in subscribed power from 14913.978 kVA to 14010.100 kVA, a reduction in the transformer load rate from 99.4% to 93.4%, a reduction in reactive power called from 5481.729 kVAr to 481.729 kVAr, an increase in the active power transported by the substation from 8505.062 kW to 8962.323 kW, a reduction in the voltage drop from 4.8% to 3.9%, an increase in the power available at the secondary of the transformer station at full load from 13950 kW to 14700 kW and an annual electrical energy saving of 339943.48 kWh of electrical energy, therefore fuel savings and a reduction in CO2 and SO2 emissions due to this energy saving will be achieved. The installation of capacitor banks for optimization of reactive energy allowed a reduction in the current called therefore a reduction in the absorbed power: 14153.061 kVA, i.e. a reduction of 903.876 kVA. It is therefore essential that energy players are convinced of the need to install capacitors to reduce or even eliminate their reactive energy bill. This is necessarily accompanied by an investment by Electricité De Guinée by setting up active and reactive energy meters but also by implementing pricing in line with the reduction in the transfer of reactive energy in the network.

关键词： Compensation Power Reactive Optimal Battery capacitors

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