Superconductivity

Superconductivity is a phenomenon of exactly zero electrical resistance occurring in certain materials below a characteristic temperature. It was discovered by Heike Kamerlingh Onnes on April 8, 1911 in Leiden. (Wikipedia.org)






Conferences related to Superconductivity

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2021 IEEE/MTT-S International Microwave Symposium - IMS 2021

The IEEE MTT-S International Microwave Symposium (IMS) is the premier conference covering basic technologies, to passives and actives components to system over a wide range of frequencies including VHF, UHF, RF, microwave, millimeter-wave, terahertz, and optical. The conference will encompass the latest in RFIC, MIC, MEMS and filter technologies, advances in CAD, modeling, EM simulation, wireless systems, RFID and related topics.

  • 2006 IEEE/MTT-S International Microwave Symposium - MTT 2006

  • 2007 IEEE/MTT-S International Microwave Symposium - MTT 2007

  • 2008 IEEE/MTT-S International Microwave Symposium - MTT 2008

  • 2009 IEEE/MTT-S International Microwave Symposium - MTT 2009

    The IEEE International Microwave Symposium (IMS) is the world s foremost conference covering the UHF, RF, wireless, microwave, millimeter-wave, terahertz, and optical frequencies; encompassing everything from basic technologies to components to systems including the latest RFIC, MIC, MEMS and filter technologies, advances in CAD, modeling, EM simulation and more. The IMS includes technical and interactive sessions, exhibits, student competitions, panels, workshops, tutorials, and networking events.

  • 2010 IEEE/MTT-S International Microwave Symposium - MTT 2010

    Reports of research and development at the state-of-the-art of the theory and techniques related to the technology and applications of devices, components, circuits, modules and systems in the RF, microwave, millimeter-wave, submillimeter-wave and Terahertz ranges of the electromagnetic spectrum.

  • 2011 IEEE/MTT-S International Microwave Symposium - MTT 2011

    The IEEE International Microwave Symposium (IMS) is the world s foremost conference covering the UHF, RF, wireless, microwave, millimeter-wave, terahertz, and optical frequencies; encompassing everything from basic technologies to components to systems including the latest RFIC, MIC, MEMS and filter technologies, advances in CAD, modeling, EM simulation and more. The IMS includes technical and interactive sessions, exhibits, student competitions, panels, workshops, tutorials, and networking events.

  • 2012 IEEE/MTT-S International Microwave Symposium - MTT 2012

    The IEEE International Microwave Symposium (IMS) is the world s foremost conference covering the UHF, RF, wireless, microwave, millimeter-wave, terahertz, and optical frequencies; encompassing everything from basic technologies to components to systems including the latest RFIC, MIC, MEMS and filter technologies, advances in CAD, modeling, EM simulation and more. The IMS includes technical and interactive sessions, exhibits, student competitions, panels, workshops, tutorials, and networking events.

  • 2013 IEEE/MTT-S International Microwave Symposium - MTT 2013

    The IEEE MTT-S International Microwave Symposium (IMS) is the premier conference covering basic technologies, to passives and actives components to system over a wide range of frequencies including VHF, UHF, RF, microwave, millimeter -wave, terahertz, and optical. The conference will encompass the latest in RFIC, MIC, MEMS and filter technologies, advances in CAD, modeling, EM simulation, wireless systems, RFID and related topics.The IMS includes technical and interactive sessions, exhibits, student competitions, panels, workshops, tutorials, and networking events.

  • 2014 IEEE/MTT-S International Microwave Symposium - MTT 2014

    IMS2014 will cover developments in microwave technology from nano devices to system applications. Technical paper sessions, interactive forums, plenary and panel sessions, workshops, short courses, industrial exhibits, and a wide array of other technical activities will be offered.

  • 2015 IEEE/MTT-S International Microwave Symposium - MTT 2015

    The IEEE MTT-S International Microwave Symposium (IMS) is the premier conference covering basic technologies, to passives and actives components to system over a wide range of frequencies including VHF, UHF, RF, microwave, millimeter-wave, terahertz, and optical. The conference will encompass the latest in RFIC, MIC, MEMS and filter technologies, advances in CAD, modeling, EM simulation, wireless systems, RFID and related topics. The IMS includes technical sessions, both oral and interactive, worksh

  • 2016 IEEE/MTT-S International Microwave Symposium - IMS 2016

    The IEEE International Microwave Symposium (IMS) is the world s foremost conference covering the UHF, RF, wireless, microwave, millimeter-wave, terahertz, and optical frequencies; encompassing everything from basic technologies to components to systems including the latest RFIC, MIC, MEMS and filter technologies, advances in CAD, modeling, EM simulation and more. The IMS includes technical and interactive sessions, exhibits, student competitions, panels, workshops, tutorials, and networking events.

  • 2017 IEEE/MTT-S International Microwave Symposium - IMS 2017

    The IEEE MTT-S International Microwave Symposium (IMS) is the premier conference covering basic technologies, to passives and actives components to system over a wide range of frequencies including VHF, UHF, RF, microwave, millimeter-wave, terahertz, and optical. The conference will encompass the latest in RFIC, MIC, MEMS and filter technologies, advances in CAD, modeling, EM simulation, wireless systems, RFID and related topics.

  • 2018 IEEE/MTT-S International Microwave Symposium - IMS 2018

    Microwave theory and techniques, RF/microwave/millimeter-wave/terahertz circuit design and fabrication technology, radio/wireless communication.

  • 2019 IEEE/MTT-S International Microwave Symposium - IMS 2019

    Comprehensive symposium on microwave theory and techniques including active and passive circuit components, theory and microwave systems.

  • 2029 IEEE/MTT-S International Microwave Symposium - IMS 2029

    The IEEE International Microwave Symposium (IMS) is the world s foremost conference covering the UHF, RF, wireless, microwave, millimeter-wave, terahertz, and optical frequencies; encompassing everything from basic technologies to components to systems including the latest RFIC, MIC, MEMS and filter technologies, advances in CAD, modeling, EM simulation and more. The IMS includes technical and interactive sessions, exhibits, student competitions, panels, workshops, tutorials, and networking events.


2018 IEEE International Conference on Applied Superconductivity and Electromagnetic Devices (ASEMD)

International Conference on Applied Superconductivity and Electromagnetic Devices (ASEMD 2018) will be held from April 15 to 18, 2018 in Tianjin, sponsored by IEEE Beijing Section. ASEMD2018 continues the focus on the applied superconductivity and electromagnetic devices. It provides a forum for both university and industry academic researchers and experts in the relevant fields to discuss and share ideas, present results, reflect on past experiences and discuss future developments. The scope of the conference includes principally the following topics:Strong Current and Large Scale Applied SuperconductivitySuperconducting ElectronicsSuperconducting MaterialsElectromagnetic MaterialsElectromagnetic DevicesElectric Power DevicesElectrical MachinesEnergy Efficiency DevicesPower Electronic Devices and CircuitsMechatronicsControl and Measurement Computing and Informatics

  • 2009 International Conference on Applied Superconductivity and Electromagnetic Devices (ASEMD)

    Strong Current and Large Scale Applied Superconductivity Superconducting Electronics Superconducting and Electromagnetic Materials Electromagnetic Devices Electric Power Devices Electrical Machines Energy Efficiency Devices Power Electronic Devices and Circuits Advanced Devices of Control and Measurement

  • 2011 International Conference on Applied Superconductivity and Electromagnetic Devices (ASEMD)

    Strong Current and Large Scale Applied Superconductivity, Superconducting Electronics, Superconducting and Electromagnetic Materials, Electromagnetic Devices, Electric Power Devices, Electrical Machines, Energy Efficiency Devices, Power Electronic Devices and Circuits, Control and Measurement.

  • 2013 IEEE International Conference on Applied Superconductivity and Electromagnetic Devices (ASEMD)

    Strong Current and Large Scale Applied SuperconductivitySuperconducting ElectronicsSuperconducting and Electromagnetic MaterialsElectromagnetic DevicesElectric Power DevicesElectrical MachinesEnergy Efficiency DevicesPower Electronic Devices and CircuitsControl and Measurement Applied superconductivity, Electromagnetic devices, Electric machine, Electric power, Electronic devices, Strong current and large scale superconductor applications, Superconducting materials, Electromagnetic materials, Control, Measurement

  • 2015 IEEE International Conference on Applied Superconductivity and Electromagnetic Devices (ASEMD)

    International Conference on Applied Superconductivity and Electromagnetic Devices (ASEMD2015) will be held from 20 to 23 November 2015 in Shanghai, sponsored by IEEE Beijing Section. ASEMD2015 continues the focus on the applied superconductivity and electromagnetic devices. It provides a forum for both university and industry academic researchers and experts in the relevant fields to discuss and share ideas, present results, reflect on past experiences and discuss future developments. The accepted conference papers will be uploaded to the IEEE Xplore and EI indexed.The scope of the conference includes principally the following topics:Strong Current and Large Scale Applied SuperconductivitySuperconducting ElectronicsSuperconducting MaterialsElectromagnetic MaterialsElectromagnetic DevicesElectric Power DevicesElectrical MachinesEnergy Efficiency DevicesPower Electronic Devices and CircuitsMechatronicsControl and Measurement Computing and Informatics


2017 36th Chinese Control Conference (CCC)

variable structure control; vehicle systems control; sensor networks; big data analysis and compressed sampling; nonlinear systems control; nonlinear systems theory; complexity and complex system theory; industrial systems and manufacturing; transportation systems; robust control; fuzzy system and fuzzy control; neural networks; data driven modeling and control; stochastic systems; micro-nano and quantum systems; stability and stabilization; systems modeling and identification; motion control; signal processing and information fusion; intelligent robot; etc.

  • 2006 Chinese Control Conference (CCC)

  • 2007 Chinese Control Conference (CCC)

    The CCC is an annual international conference organized by Tech. Com. on Control Theory, CAA. It provides a forum for scientists and engineers over the world to present their new theoretical results and techniques in the field of systems and control. The conference consists of pre-conference workshops, plenary talks, oral and poster sessions etc. for academic exchanges. The 26th CCC is organized by the Central South University and will be held in Zhangjiajie.

  • 2008 Chinese Control Conference (CCC)

    The Chinese Control Conference (CCC) is an annual international conference organized by Tech. Com. on Control Theory, CAA. It provides a forum for scientists and engineers over the world to present their new theoretical results and techniques in the field of systems and control. The conference consists of plenary talks, panel discussions, oral and poster sessions etc. for academic exchanges. The conference proceedings have been selected for coverage in ISI proceedings/ISTP (Index to Scientific and Technical

  • 2010 29th Chinese Control Conference (CCC)

    S1 System Theory and Control Theory S2 Nonlinear Systems and Control S3 Complexity and Complex System Theory S4 Distributed Parameter Systems S5 Stability and Stabilization S6 Large Scale Systems S7 Stochastic Systems S8 System Modeling and System Identification S9 DEDS and Hybrid Systems S10 Optimal Control S11 Optimization and Scheduling S12 Robust Control S13 Adaptive Control and Learning Control S14 Variable Structure Control S15 Neural

  • 2011 30th Chinese Control Conference (CCC)

    Systems and Control

  • 2012 Chinese Control Conference (CCC)

    The Chinese Control Conference (CCC) is an annual international conference organized by the Technical Committee on Control Theory (TCCT), Chinese Association of Automation (CAA). It provides a forum for scientists and engineers over the world to present their new theoretical results and techniques in the field of systems and control. The conference consists of pre-conference workshops, plenary talks, panel discussions, invited sessions, oral sessions and poster sessions etc. for academic exchanges.

  • 2013 32nd Chinese Control Conference (CCC)

    The Chinese Control Conference (CCC) is an annual international conference initiated by the Technical Committee on Control Theory (TCCT), Chinese Association of Automation (CAA). It provides a forum for scientists and engineers over the world to present their new theoretical results and techniques in the field of systems and control. The conference consists of plenary talks, panel discussions, invited sessions, pre-conference workshops, oral sessions and poster sessions etc. for academic exchanges.

  • 2014 33rd Chinese Control Conference (CCC)

    variable structure control; vehicle systems control; sensor networks; big data analysis and compressed sampling; nonlinear systems control; nonlinear systems theory; complexity and complex system theory; industrial systems and manufacturing; transportation systems; robust control; fuzzy system and fuzzy control; neural networks; data driven modeling and control; stochastic systems; micro-nano and quantum systems; stability and stabilization; systems modeling and identification; motion control; signal processing and information fusion; intelligent robot; etc.

  • 2015 34th Chinese Control Conference (CCC)

    The Chinese Control Conference (CCC) is an annual international conference initiated by the Technical Committee on Control Theory (TCCT), Chinese Association of Automation (CAA). It provides a forum for scientists and engineers over the world to present their new theoreticalresults and techniques in the field of systems and control. The conference consists of plenary talks, panel discussions, invited sessions, pre-conference workshops, oral sessions and poster sessions etc. for academic exchanges.

  • 2016 35th Chinese Control Conference (CCC)

    variable structure control; vehicle systems control; sensor networks; big data analysis andcompressed sampling; nonlinear systems control; nonlinear systems theory; complexity andcomplex system theory; industrial systems and manufacturing; transportation systems; robustcontrol; fuzzy system and fuzzy control; neural networks; data driven modeling and control;stochastic systems; micro-nano and quantum systems; stability and stabilization; systemsmodeling and identification; motion control; signal processing and information fusion; intelligentrobot; etc.


2016 Annual Conference on Magnetism and Magnetic Materials (MMM)

Focus in on fundamental and applied magnetism. Invited, contributed papers plus oral and poster presentations and invited symposia. Developments in all areas of magnetism research are discussed.


2012 European Microwave Conference (EuMC)

Microwave and millimeter wave: active/passive devices, antennas, electromagnetics, bio-interaction, circuits, manufacturing and measurement, MEMS, meta-materials, sensor networks, cognitive radio, 4G communications, space technology and applications.

  • 2006 European Microwave Conference (EuMC)

  • 2007 European Microwave Conference (EuMC)

    Status and trends in microwave and millimetre-wave systems and technologies. High-frequency related topics, from materials and technologies to integrated circuits, systems and applications in all their aspects: theory, simulation, design and measurement including passive components, modelling and design of high frequency and high data rate photonics, highly stable and noiseless microwave and millimetre-wave sources, new linearisation techniques and the impact of new packaging.

  • 2008 European Microwave Conference (EuMC)

    The 38th European Microwave Conference (EuMC) in Amsterdam, The Netherlands, from 27 to 31 October, is the core of the European Microwave Week 2008, the largest event in Europe dedicated to microwave electronics. It is the premier forum to present the actual status and future trends in the field of materials and technologies to integrated circuits, systems and applications will be addressed in all their aspects: theory, simulation, design and measurement.

  • 2009 European Microwave Conference (EuMC)

    The 39th European Microwave Conference (EuMC), is the core of the European Microwave Week 2009, the largest event in Europe dedicated to microwave electronics. It is the premier forum to present the actual status and future trends in the field of materials and technologies to integrated circuits, systems and applications will be addressed in all their aspects: theory, simulation, design and measurement.

  • 2010 European Microwave Conference (EuMC)

    The European Microwave Conference is the premier forum for presentation of the present status and future trends in the field of microwave, millimetre- and submillimetre-wave systems and technologies.

  • 2011 European Microwave Conference (EuMC)

    Status and trends in microwave and millimetre-wave systems and technologies. High-frequency related topics, from materials and technologies to integrated circuits, systems and applications in all their aspects: theory, simulation, design and measurement including passive components, modelling and design of high frequency and high data rate photonics, highly stable and noiseless microwave and millimetre-wave sources, new linearisation techniques and the impact of new packaging technologies on development app



Periodicals related to Superconductivity

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Antennas and Propagation, IEEE Transactions on

Experimental and theoretical advances in antennas including design and development, and in the propagation of electromagnetic waves including scattering, diffraction and interaction with continuous media; and applications pertinent to antennas and propagation, such as remote sensing, applied optics, and millimeter and submillimeter wave techniques.


Applied Superconductivity, IEEE Transactions on

Contains articles on the applications and other relevant technology. Electronic applications include analog and digital circuits employing thin films and active devices such as Josephson junctions. Power applications include magnet design as well asmotors, generators, and power transmission


Magnetics, IEEE Transactions on

Science and technology related to the basic physics and engineering of magnetism, magnetic materials, applied magnetics, magnetic devices, and magnetic data storage. The Transactions publishes scholarly articles of archival value as well as tutorial expositions and critical reviews of classical subjects and topics of current interest.


Microwave and Wireless Components Letters, IEEE

Published monthly with the purpose of providing fast publication of original and significant contributions relevant to all aspects of microwave/millimeter-wave technology. Emphasis is on devices, components, circuits, guided-wave structures, systems and applications covering the frequency spectrum from microwave and beyond, including submillimeter-waves and infrared.


Microwave Theory and Techniques, IEEE Transactions on

Microwave theory, techniques, and applications as they relate to components, devices, circuits, and systems involving the generation, transmission, and detection of microwaves.



Most published Xplore authors for Superconductivity

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Xplore Articles related to Superconductivity

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Melt processing for obtaining REBa/sub 2/Cu/sub 3/O/sub y/ superconductors (RE=Nd, Sm) with high T/sub c/ and large J/sub c/

IEEE Transactions on Applied Superconductivity, 1995

An oxygen-controlled melt growth (OCMG) process has been employed for NdBa/sub 2/Cu/sub 3/O/sub y/ (Nd123) and SmBa/sub 2/Cu/sub 3/O/sub y/ (Sm123) superconductors for a comparative study. Both Nd123 and Sm123 samples melt- grown in reduced oxygen atmospheres exhibited an enhanced superconducting transition temperature (T/sub c/) with a sharp transition and large critical current density (J/sub c/) in a high field ...


Design of Superconductivity Windings of a 35-kV/3.5-MVA Single-Phase HTS-Controllable Reactor

IEEE Transactions on Applied Superconductivity, 2015

In order to compensate flexibly reactive power, it is necessary to develop a controllable reactor in long-distance and ultrahigh-voltage system. High- temperature superconductivity-controllable reactor (HTS-CR) is a potential equipment in power system. A 35-kV/3.5-MVA single-phase HTS-CR is being developed. The HTS windings of the HTS-CR are made of double pancakes that are wound with HTS tapes connected in parallel. The ...


The effects of nano-scale iron doping on superconductivity and microstructure of MgB<inf>2</inf> bulk

2009 International Conference on Applied Superconductivity and Electromagnetic Devices, 2009

Mg1-xFexB2 superconductor was prepared by in situ solid state reaction to study the effects of nano-iron doping on the superconductivity of MgB2. Two kinds of nano-iron sources were used: nano-iron particles and nano-iron wires. It was found that crystal structure was not affected by nano-iron doping for either form of dopant source. Tc, Jc, and Hirr were severely suppressed by ...


Influence of Ball-Milled Low Purity Boron Powder on the Superconductivity of<formula formulatype="inline"><tex>${\rm MgB}_{2}$</tex></formula>

IEEE Transactions on Applied Superconductivity, 2007

MgB2samples were prepared using as-supplied commercial 96% boron with strong crystalline phase and the same 96% boron (B) after ball milling. The effects of the properties of the starting B powder on the superconductivity were evaluated. We observed that samples using ball-milled 96% B, in comparison with the one made from the as-supplied 96% B, were characterized by small grain ...


Improving superconductivity and mechanical properties of Bi-2223/Ag-wire composite bulk by cold isostatic pressing

IEEE Transactions on Applied Superconductivity, 2003

To improve superconductivity and mechanical properties of Bi-2223 sintered bulk, silver (Ag) wires of 0.4 mm in diameter were added to the bulk. The sample was sintered at 840/spl deg/C for 50 hours in air. After treatment with cold isostatic pressing (CIP), the sample was re-sintered. When twenty-four Ag wires were composed, the critical current density (J/sub c/) at 4.2 ...



Educational Resources on Superconductivity

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IEEE.tv Videos

ASC-2014 Plenary series - 1 of 13 - Monday 2014/8/11
IMS 2011-100 Years of Superconductivity (1911-2011) - Existing and Emerging RF Applications of Superconductivity
ASC-2014 Plenary series - 3 of 13 - Monday 2014/8/11
ASC-2014 10 Years beyond the 50th Anniversary of High Field Superconductivity: 2 of 9 - Hem Kanithi
ASC-2014 10 Years beyond the 50th Anniversary of High Field Superconductivity: 9 of 9 - Marina Putti
ASC-2014 10 Years beyond the 50th Anniversary of High Field Superconductivity: 1 of 9 David Larbalestier
ASC-2014 10 Years beyond the 50th Anniversary of High Field Superconductivity: 7 of 9 - Venkat Selvamanickam
ASC-2014 10 Years beyond the 50th Anniversary of High Field Superconductivity: 4 of 9 - IldarAbdyukhanov
ASC-2014 Plenary series - 2 of 13 - Monday 2014/8/11
ASC-2014 10 Years beyond the 50th Anniversary of High Field Superconductivity: 6 of 9 - LucaBottura
ASC-2014 10 Years beyond the 50th Anniversary of High Field Superconductivity: 3 of 9 - Jeff Parrell
ASC-2014 10 Years beyond the 50th Anniversary of High Field Superconductivity: 8 of 9 - Takanobu Kiss
ASC-2014 10 Years beyond the 50th Anniversary of High Field Superconductivity: 5 of 9 - Manfred Thoener
Unconventional Superconductivity: From History to Mystery
Cryogenics for Applied Superconductivity - ASC-2014 Plenary series - 11 of 13 - Friday 2014/8/15
Superconducting quantum computing research and applications in the United States - Applied Superconductivity Conference 2018
Superconducting quantum computing research in Japan - Applied Superconductivity Conference 2018
30 Years to High Temperature Superconductivity (HTS): Status and Perspectives
Probing the Universe with Gravitational Waves - Applied Superconductivity Conference 2018
Recent Research Activities of Applied Superconductivity in China

IEEE-USA E-Books

  • Melt processing for obtaining REBa/sub 2/Cu/sub 3/O/sub y/ superconductors (RE=Nd, Sm) with high T/sub c/ and large J/sub c/

    An oxygen-controlled melt growth (OCMG) process has been employed for NdBa/sub 2/Cu/sub 3/O/sub y/ (Nd123) and SmBa/sub 2/Cu/sub 3/O/sub y/ (Sm123) superconductors for a comparative study. Both Nd123 and Sm123 samples melt- grown in reduced oxygen atmospheres exhibited an enhanced superconducting transition temperature (T/sub c/) with a sharp transition and large critical current density (J/sub c/) in a high field region at 77 K and for the applied field parallel to the c-axis of samples (H/c). For Nd123, a preferential formation of high T/sub c/ phase in a low oxygen partial pressure (P(O/sub 2/)) could be qualitatively described considering the thermodynamic stability boundaries of the Nd/sub 1+x/Ba/sub 2-x/Cu/sub 3/O/sub y/ solid solutions on the LOG[P(O/sub 2/)] vs. 1/T (K/sup 9/-1) phase diagram. A long-term oxygen annealing study for an OCMG-processed Nd123 sample revealed that the annealing temperature should be as low as 300/spl deg/C.<<ETX>>

  • Design of Superconductivity Windings of a 35-kV/3.5-MVA Single-Phase HTS-Controllable Reactor

    In order to compensate flexibly reactive power, it is necessary to develop a controllable reactor in long-distance and ultrahigh-voltage system. High- temperature superconductivity-controllable reactor (HTS-CR) is a potential equipment in power system. A 35-kV/3.5-MVA single-phase HTS-CR is being developed. The HTS windings of the HTS-CR are made of double pancakes that are wound with HTS tapes connected in parallel. The relationship between the number of double pancakes and the number of HTS tapes, which has great effect on the current of each HTS tape, is studied. Furthermore, the solution that reduces the ac loss of the HTS winding is also investigated, which discloses the optimized design parameters and the calculation results of the HTS windings. The study here is believed to provide some references for developing HTS-CR with larger capacity in the future.

  • The effects of nano-scale iron doping on superconductivity and microstructure of MgB<inf>2</inf> bulk

    Mg1-xFexB2 superconductor was prepared by in situ solid state reaction to study the effects of nano-iron doping on the superconductivity of MgB2. Two kinds of nano-iron sources were used: nano-iron particles and nano-iron wires. It was found that crystal structure was not affected by nano-iron doping for either form of dopant source. Tc, Jc, and Hirr were severely suppressed by iron nano-particles doping. In contrast, with iron nano-wires doping, Tc of the MgB2 superconductors were not changed remarkably, while their Jc and Hirr were slightly enhanced at all the temperature ranges investigated in this work. Under 4 T field, the sample doped with 1% wt iron nano-wires reached the highest Jc of 1.1 times 104 A/cm2 at 10 K and 2.2 times102 A/cm2 at 20 K, respectively. It was argued that the Fe nano-wires may be introduced into MgB2 as external pinning centers in high field region.

  • Influence of Ball-Milled Low Purity Boron Powder on the Superconductivity of<formula formulatype="inline"><tex>${\rm MgB}_{2}$</tex></formula>

    MgB2samples were prepared using as-supplied commercial 96% boron with strong crystalline phase and the same 96% boron (B) after ball milling. The effects of the properties of the starting B powder on the superconductivity were evaluated. We observed that samples using ball-milled 96% B, in comparison with the one made from the as-supplied 96% B, were characterized by small grain size, broadened full width at half maximum (FWHM), and enhanced magnetic critical current density (Jc). Jcreached 2 times 103A cm-2at 5 K and 8 T. The improved pinning of these samples seems to be caused by enhanced grain boundary pinning at high field.

  • Improving superconductivity and mechanical properties of Bi-2223/Ag-wire composite bulk by cold isostatic pressing

    To improve superconductivity and mechanical properties of Bi-2223 sintered bulk, silver (Ag) wires of 0.4 mm in diameter were added to the bulk. The sample was sintered at 840/spl deg/C for 50 hours in air. After treatment with cold isostatic pressing (CIP), the sample was re-sintered. When twenty-four Ag wires were composed, the critical current density (J/sub c/) at 4.2 K and self-field increased from 1,200 A/cm/sup 2/ to 2,000 A/cm/sup 2/ with the CIP process. SEM observation results showed that high alignment and dense structures of Bi-2223 plate-like grains were formed around the interfacial region between the superconducting oxide and the metal Ag. The mechanical properties were measured by a three point bending test. The maximum bending stress of 60 MPa was obtained in the bulk without Ag wire, which was fractured separately. With the CIP process the maximum bending stress increased to 90 MPa for the composite. The composite did not fracture but only fine cracks were induced after the maximum bending stress.

  • Effects of Pb doping on the microstructure and superconductivity of bulk BSCCO 2212

    BSCCO 2212 suffers from intrinsic weak flux pinning above /spl sim/20 K. From the view point of practical applications, it is particularly important to expand the irreversible regime up to considerably higher temperatures. BSCCO 2212 (molar ratio Bi:Pb:Sr:Ca:Cu:O=2-x:x:2:1:2) bulk samples have been synthesized using partial-melt processing in air with Pb contents x up to 0.8. Pb doping has been shown to reduce the melting temperature as well as improve the irreversibility field, X-ray diffraction and scanning electron microscopy along with superconducting property measurement were carried out to investigate the phase evolution and microstructure. Melt texturing showed considerably large plate-like grains with enhanced 001 reflection peaks. Effects of the Pb doping on the melt processing and superconductivity as a function of temperature and magnetic field will be discussed.

  • Superconductivity: a brief introduction to its phenomenology and theories

    A brief introduction to the phenomenology of superconductivity is presented. A section on the superconducting state considers the main features of superconductivity; the superconducting transition temperature, zero resistivity, the Meissner effect, the isotope effect, microwave and optical properties, and the superconducting energy gap. A second section on the Ginzburg-Landau equations is concerned with the concepts of coherence length, penetration depth, flux quantization, magnetic-field dependence of the energy gap, quantum interference phenomena, and the Josephson effect. The final section on the new superconductors briefly reviews the new field of high- temperature superconductivity, its experimental facts, and current theories.<<ETX>>

  • Effects of initial, intermediate and final sinterings in preparation of Ag-sheathed Bi-2223 tapes

    Effects of initial, intermediate and final sintering on superconducting properties, morphology, and critical current density, J/sub c/, were studied in Ag-sheathed Bi(Pb)-Sr-Ca-Cu-O tapes prepared using the powder-in-tube method and repetitions of a combined process of pressing and sintering. The variables in the repetitive process were a history by which the calcined constituent powders were heat treated before filled into Ag-tubes, and duration periods of the intermediate and final sinterings. The effects are discussed in terms of conversion of 2212 phase to 2223 and vice versa, the formation mechanism of 2223 phase, and alignment and connection of the 2223 grains. In the present study, a J/sub c/ on the order to 10/sup 4/ A/cm/sup 2/ at 77 K and 0 T was obtained.<<ETX>>

  • Analysis of critical-state problems in type-II superconductivity

    An efficient numerical scheme is proposed for modeling the hysteretic magnetization of type-II superconductors. Numerical examples are presented for the Bean and Kim critical state models. It is shown that Bean's model is a Hele-Shaw type problem.

  • The relationship between nano-scale Sm211/Sm123 interfaces and superconductivity of Sm-Ba-Cu-O materials

    The distribution of dislocations at the interface between the Sm/sub 2/BaCuO/sub 5/ particles (Sm211-particles) and SmBa/sub 2/Cu/sub 3/O/sub 7/ (Sm123) matrix with different 211-particle size from /spl mu/m to nm was measured. It is found that the density of dislocations varies with the different curvatures of the 211-particles. There is a higher density of dislocations around small-sized 211-particles, especially those with sharp corners, which act as pinning centers and thus enhance the J/sub c/(H,T) values of the superconductors. A phenomenological model has been proposed to describe the relationship between the curvature of 211-particles, the dislocation density around 211/123 interface, as well as the J/sub c/(H,T).



Standards related to Superconductivity

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No standards are currently tagged "Superconductivity"