Method And Composition For Improving Flux Pinning And Critical Current In Superconductors
DOWNLOAD
Download Method And Composition For Improving Flux Pinning And Critical Current In Superconductors PDF/ePub or read online books in Mobi eBooks. Click Download or Read Online button to get Method And Composition For Improving Flux Pinning And Critical Current In Superconductors book now. This website allows unlimited access to, at the time of writing, more than 1.5 million titles, including hundreds of thousands of titles in various foreign languages. If the content not found or just blank you must refresh this page
Method And Composition For Improving Flux Pinning And Critical Current In Superconductors
DOWNLOAD
Author :
language : en
Publisher:
Release Date : 1995
Method And Composition For Improving Flux Pinning And Critical Current In Superconductors written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with categories.
Superconducting materials and methods of forming superconducting materials are disclosed. Highly oxidized superconductors are heated at a relatively high temperature so as to release oxygen, which migrates out of the material, and form a non-superconducting phase which does not diffuse out of grains of the material. The material is then reoxidized at a lower temperature, leaving the non-superconducting inclusions inside a superconducting phase. The non-superconducting inclusions act as pinning centers in the superconductor, increasing the critical current thereof.
Flux Pinning In Superconductors
DOWNLOAD
Author : Teruo Matsushita
language : en
Publisher: Springer Nature
Release Date : 2022-08-31
Flux Pinning In Superconductors written by Teruo Matsushita and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-08-31 with Technology & Engineering categories.
This book covers the flux pinning mechanisms and properties and the electromagnetic phenomena caused by the flux pinning common for metallic, high-Tc and MgB2 superconductors. The condensation energy interaction known for normal precipitates or grain boundaries and the kinetic energy interaction proposed for artificial Nb pins in Nb-Ti, etc., are introduced for the pinning mechanism. Summation theories to derive the critical current density are discussed in detail. Irreversible magnetization and AC loss caused by the flux pinning are also discussed. The loss originally stems from the ohmic dissipation of normal electrons in the normal core driven by the electric field induced by the flux motion. The influence of the flux pinning on the vortex phase diagram in high Tc superconductors is discussed, and the dependencies of the irreversibility field are also described on other quantities such as anisotropy of superconductor, specimen size and electric field strength. Recent developments of critical current properties in various high-Tc superconductors and MgB2 are introduced. The 3rd edition has been thoroughly updated, with a new chapter on critical state model. The mechanism of irreversible properties is discussed in detail. The author provides calculations of pinning loss by the equation of motion of flux lines in the pinning potential and hysteresis loss. The readers will learn why the resultant loss is of hysteresis type in spite of such mechanism. This book aims for graduate students and researchers studying superconductivity as well as engineers working in electric utility industry.
Advances In Superconductivity Iii
DOWNLOAD
Author : Koji Kajimura
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Advances In Superconductivity Iii written by Koji Kajimura and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Technology & Engineering categories.
Since the discovery of high temperature superconductors, many new materials have been invented. In the last year, several new materials were also discovered, but their critical temperatures are still below lOOK. Precise physical and chemical work has made tremendous progress in the theoretical and experimental study of physical properties and carrier state characterizations. The de Haas van Alphen effect measurement showed the existence of a Fermi surface in YBCO. Flux dynamics is a well-known new problem in which flux creep and irreversibility line features are especially important for a fundamental understanding of the critical current and flux pinning. Flux pinning centers which are intentionally added using non-superconducting precipitates, neutrons, and protons, etc. increase critical currents to practical levels. The analysis of electric and magnetic properties are expected to reveal the pinning mechanism and also to further application development. As for wires and bulks, many melt-like sintering techniques have improved the material performance of critical current densities. A new seeding Quench-Melt Growth technique enlarged crystal size and increased the repulsion force. These melting processes, in conjunction with a mechanical strength improvement have been effectively introduced into wire fabrication in order to realize kilometer range wires and will put the oxide wires to practical use. Where thin film is con cerned, when many fabrication methods had been developed using the assistance effect of activated oxygen such as ozone and oxygen radicals, a high current 2 density of 106A/cm at 77K was reported.
Critical Currents In Superconductors Proceedings Of The 8th International Workshop
DOWNLOAD
Author : Teruo Matsushita
language : en
Publisher: World Scientific
Release Date : 1996-11-26
Critical Currents In Superconductors Proceedings Of The 8th International Workshop written by Teruo Matsushita and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996-11-26 with categories.
This workshop includes about 110 papers describing the flux pinning and related electromagnetic phenomena in superconductors. Various problems are argued on exotic properties of flux lines, flux dynamics, flux pinning mechanisms, critical current density and critical state phenomena in both high- and low-temperature superconductors.
Critical Current Flux Pinning And Optical Studies Of High Temperature Superconductors
DOWNLOAD
Author : Anant Narlikar
language : en
Publisher: Nova Science Pub Incorporated
Release Date : 1997
Critical Current Flux Pinning And Optical Studies Of High Temperature Superconductors written by Anant Narlikar and has been published by Nova Science Pub Incorporated this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with Science categories.
Critical Currents In Superconductors For Practical Applications Proceedings Of The International Workshop
DOWNLOAD
Author : Zhou Lian
language : en
Publisher: World Scientific
Release Date : 1998-02-28
Critical Currents In Superconductors For Practical Applications Proceedings Of The International Workshop written by Zhou Lian and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998-02-28 with categories.
This proceedings volume reviews the recent developments of superconducting materials for practical applications and critical current characteristics. It contains 18 invited papers and 72 contributed papers. The scope of these papers includes: (1) synthesis and processing of practical materials, (2) properties of high-Tc tapes, coils and bulk materials, (3) critical currents and microstructure, (4) flux dynamics and pinning mechanisms, (5) applications of high-Tc materials, (6) applications of low-Tc superconductors, (7) processing, physical properties and applications of high-Tc thin films.
Handbook Of Superconducting Materials
DOWNLOAD
Author : David A. Cardwell
language : en
Publisher: CRC Press
Release Date : 2003
Handbook Of Superconducting Materials written by David A. Cardwell and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Science categories.
With the advent of High Temperature Superconductivity and the increasing reliability of fabrication techniques, superconductor technology has moved firmly into the mainstream of academic and industrial research. There is currently no single source of practical information giving guidance on which technique to use for any particular category of superconductor. An increasing number of materials scientists and electrical engineers require easy access to practical information, sensible advice and guidance on 'best-practice' and reliable, proven fabrication and characterisation techniques.The Handbook will be the definitive collection of material describing techniques for the fabrication and analysis of superconducting materials. In addition to the descriptions of techniques, authoritative discussions written by leading researchers will give guidance on the most appropriate technique for a particular situation.Characterisation and measurement techniques will form an important part of the Handbook, providing researchers with a standard reference for experimental techniques. The tutorial style description of these techniques makes the Handbook particularly suitable for use by graduate students.The Handbook will be supported by a comprehensive web site which will be updated with new data as it emerges.The Handbook has six main sections: -- Fundamentals of Superconductivity - characteristic properties, elementary theory, critical current of type II superconductors-- Processing - bulk materials, wires and tapes, thick and think films, contact techniques-- Characterisation Techniques - structure/microstructure, measurement and interpretation of electromagnetic properties,measurement of physics properties-- Materials - characteristic properties of low and high Tc materials-- Applications - high current applications, trapped flux devices, high frequency devices, josephson junction devic
Advances In Superconductivity Vii
DOWNLOAD
Author : Kaoru Yamafuji
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Advances In Superconductivity Vii written by Kaoru Yamafuji and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.
The field of high-temperature superconductivity has encouraged an inter disciplinary approach to research. It has required significant cooperation and collaboration among researchers, each of whom has brought to it a rich variety of experience from many other fields. Recently, great improvements have been made in the quality of research. The subject has matured and been launched into the next stage through the resonance between science and technology. The current progress of materials processing and engineering in this field is analogous to that previously seen in the development of semiconductors. These include the appearance of materials taking the place of YBa2Cu307 owing to their improved properties (higher critical temperatures and stronger flux pin ning) in which rare earth ions with large radii (La, Nd, Sm) substitute for Y; the development of technology enabling growth control on the nanometer scale; and precise and reproducible measurements that can be used as rigorous tests of theoretical models, which in turn are expected to lead to the develop ment of new devices. For further progress in high-T research, academics and c technologists must pool their knowledge and experience. I hope that this volume will promote that goal by providing the reader with the latest results of high-temperature superconductor research and will stimulate further discussion and collaboration.
Flux Pinning And Critical Currents In A 15 Superconductors
DOWNLOAD
Author : J. D. Livingston
language : en
Publisher:
Release Date : 1978
Flux Pinning And Critical Currents In A 15 Superconductors written by J. D. Livingston and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1978 with categories.
The relationship between processing, microstructure, and properties was studied for A-15 compounds in multifilamentary composites produced by solid-state diffusion and in thin-film samples produced by vapor deposition. Grain sizes of A-15 superconducting compounds were measured by transmission electron microscopy of multifilamentary composites reacted at various temperatures. Critical current densities at 4.2 K and fields up to 6 T were found to be similar for niobium-tin, vanadium-gallium, and vanadium-silicon of the same grain size. Study of the Cu-V-Si phase diagram led to the production of improved multifilamentary vanadium-silicon conductors. The effects of various alloying elements on A-15 layers produced by solid-state diffusion were studied. The most promising new observation was that tantalum can be incorporated into niobium-tin reaction layers, leading to an enhancement of critical currents at high fields. The critical temperature of vapor-deposited, niobium-germanium films has been studied as a function of deposition rates, flux stoichiometry, substrate temperature, and, especially, gas composition. Introduction of controlled levels of oxygen has been found to expand the range of Nb-Ge flux ratios which yield high critical temperatures. (Author).
Advances In Superconductivity Vi
DOWNLOAD
Author : Toshizo Fujita
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Advances In Superconductivity Vi written by Toshizo Fujita and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.
More than seven years have passed since the dramatic breakthrough in the critical temperature for superconductors. During this period, a host of new materials have been discovered, and efforts have been stepped up in a variety of domains including device and systems applications, commercialization, and basic research on the properties of superconductive materials. Recent progress in areas such as bulk single crystal production, long-scale wire and tape produc tion, flywheel and bearing applications, and electronic device applications for thin films indicate that science and technology have been working hand in hand in this field, as has been the case in the research and development of semi conductors. This interdisciplinary "resonance" will be certain to lead to further outstanding advances in the years to come. It goes without saying that worldwide information exchange is the key to accelerating progress in superconductivity science and technology. As in previous years, the ISS '93 served as a venue where visions of future develop ments were shared in addition to presentations and extensive discussions on the most up-to-date research results. I hope that the Proceedings contained in this volume will be consulted not only as a summary of the current "state of the art" in high-Tc superconductivity but also as a stimulating source of ideas regarding future applications of superconductivity research.