Relationship between microstructural defects and flux pinning properties in REBa2Cu3O7-8 thin films for 2nd generation high temperature superconducting tapes PDF Download
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Author: Xiao-Fen Li
Publisher:
ISBN: 9788755039483
Category :
Languages : en
Pages :
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Author: Xiao-Fen Li
Publisher:
ISBN: 9788755039483
Category :
Languages : en
Pages :
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Book Description
![Enhanced Flux-Pinning Properties in Superconducting YBa2Cu3O7-[delta] Thin Films with Nanoengineering Methods PDF](https://books.google.com/books/content/images/frontcover/Jq6xngEACAAJ?fife=w80-h100)
Author: Chen-Fong Tsai
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Since the discovery of the high temperature superconductor YBa2Cu3O7-[delta] (YBCO), with transition temperature (Tc = 77 K), above liquid nitrogen point in 1987 many research projects have been dedicated to enhancing the high field performance of this material for practical applications. The 2nd generation YBCO-based coated conductors are believed to be the most promising approach for commercial applications including power transmission, motors, generators, and high field magnets. With the advances of nanotechnologies, different nanoengineering methods have been demonstrated to enhance the performance of YBCO thin films, include doping with 0-dimensional (0-D) self-assembled nanoparticles, 1-dimensional (1-D) nanorods, and 2-dimensional (2-D) nanolayers. Furthermore, dopants with ferromagnetic properties are also reported to provide enhanced pinning effects by Lorentz force, especially under high-applied magnetic fields. The principle of these methods is to generate high-density defects at the heterogeneous interfaces as artificial pinning centers in an effort to improve the flux-pinning properties. The morphology and dimensions of the nanoinclusions play an important role in pining enhancement. Optimized pinning structures are likely to be located at energetically favorable vortex cores, which form a triangular lattice with dimensions close to the YBCO coherence length [xi]([xi]ab ~ 4 nm; [xi]c ~ 0.5 nm at 77 K.) However, it is challenging to achieve small dimensional nanodopants in the vapor deposited YBCO thin films. The purpose of this research is to utilize nanoengineering methods to produce optimized pinning structure in YBCO thin films. In this thesis, we systematically study the effects of different nanoinclusions on the flux-pinning properties of YBCO thin films. The 0-D ferromagnetic Fe2O3 and CoFe2O4 nanoparticles, 2-D CeO2 multilayers, and tunable vertically aligned nanocomposites (VAN) of (Fe2O3)x:(CeO2)1-x and (CoFe2O4)x:(CeO2)1-x systems are introduced into the YBCO matrix as artificial pinning centers. Results suggest that all nanoinclusions showed significant enhancement in the superconducting properties of YBCO. The ferromagnetic pinning centers dominate at high field and low temperature regimes, however, the defect pinning centers dominate at low field and high temperature regimes. The uniquely arranged VAN structure of alternating magnetic and non-magnetic nanophases, which incorporates both high defect density and tunable distribution of magnetic dopants, is believed to be an ideal solution for flux-pinning enhancement. The electronic version of this dissertation is accessible from http://hdl.handle.net/1969.1/149478
![Flux pinning and structural properties of high-T[tief]c superconducting thin films PDF](https://books.google.com/books/content/images/frontcover/7b01HQAACAAJ?fife=w80-h100)
Author: Hendrik Roelof Anastasius Douwes
Publisher:
ISBN:
Category :
Languages : en
Pages : 131
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Author: Soltan Soltan
Publisher: Cuvillier Verlag
ISBN: 3865373496
Category :
Languages : en
Pages : 166
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Category :
Languages : en
Pages : 15
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Efforts to improve the magnetic flux-pinning properties of Bi2Sr2CaCu2O(8+delta)/Ag (2212/Ag) tape conductors utilizing (Sr(1-x)Ca(x)14Cu24O(41+delta) and Sr2CaAl2O6 defects are described. Precursor powders with composition(2212 + N% volume fraction Sr10Ca4Cu24O(41+delta); N = 0, 7, 15) were prepared by solid-state reaction to obtain subsolidus phase equilibrium at 860 deg C, as measured by X-ray diffraction (XRD). Nanophase (10 - 20 nm)Al2O3 was added (1.1% mass fraction) to N = 0 and 15 fully reacted powders. Brush-on coated tapes (13 - 17 micrometers 2212 thickness) were processed by a partial-melt growth method in air with variable melting from 865 deg C to 890 deg C, and slow-cool recrystallization from 856 deg C to 847 deg C. The effect of different melt temperatures and compositions on film properties (phase assemblages, orientations, and compositions, and defect sizes) was studied by XRD, scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS).
Author: Hendrik Roelof Anastasius Douwes
Publisher:
ISBN:
Category :
Languages : en
Pages : 131
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Author:
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Category :
Languages : en
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Author:
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ISBN:
Category :
Languages : en
Pages : 4
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Various types of high temperature superconducting single crystals (TI-2223, Bi-2212, and Y-123 with oxygen contents between 6.4 and 6.64) were investigated by SQUID magnetometry. Both materials show very {open_quotes}low{close_quotes} lying irreversibility lines (Hllc), which follow an exponential law-and rise rapidly below T/T{sub c}=0.5. High critical current P densities are found only at low temperatures, e.g. J{sub c} is about 2.7{circ}101°Am−2 at 1 T and 5 K in TI-2223. A comparison of the condensation energy provided by different types of defects with the thermal energy gives evidence for pinning of individual pancakes by the as-grown defect structure.
Author: H. Weinstock
Publisher: Springer Science & Business Media
ISBN: 9401707529
Category : Technology & Engineering
Languages : en
Pages : 695
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This book, in essence the proceedings of a NATO Advanced Study Institute with the same title, is designed to provide in-depth coverage of many, but not all, of the major current applications of superconductivity, and of many that still are being developed. It will be of value to scientists and engineers who have interests in the research and production aspects of the technology, as well as in the applications themselves. The ftrst three chapters (by Clarke, Vrba and Wikswo) are devoted to an understanding of the principles, fabrication and uses of SQUID magnetometers and gradiometers, with the greatest emphasis on biomagnetism and nondestructive evaluation (NDE). For the most part, traditional low-temperature superconductor (LTS) SQUIDs are used, but particularly for NDE, high-temperature superconductor (HTS) SQUIDs are proving useful and often more convenient. The succeeding three chapters (by Przybysz, Likharev and Chaloupka) cover broader aspects of superconducting electronics. The ftrst two of these deal primarily with digital L TS circuits, while the third discusses in great detail passive component applications using HTS materials. Currently, HTS ftlters are undergoing intense J3-site testing at cellular telephone base stations. While it is clear that HTS ftlters outperform conventional ftlters in reducing signal loss and allowing for more channels in a given bandwidth, it isn't yet certain that the cellular telephone industry sees sufficient economic beneftts to make a ftrm decision to use HTS ftlters universally in its systems. If this application is generally adapted, the market for these ftlters should be quite large.
Author: Shriram Ramanathan
Publisher: Springer Science & Business Media
ISBN: 1441906649
Category : Technology & Engineering
Languages : en
Pages : 344
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Book Description
Thin Film Metal-Oxides provides a representative account of the fundamental structure-property relations in oxide thin films. Functional properties of thin film oxides are discussed in the context of applications in emerging electronics and renewable energy technologies. Readers will find a detailed description of deposition and characterization of metal oxide thin films, theoretical treatment of select properties and their functional performance in solid state devices, from leading researchers. Scientists and engineers involved with oxide semiconductors, electronic materials and alternative energy will find Thin Film Metal-Oxides a useful reference.
