High-temperature superconductors for electric power and high-energy physics

Selvamanickam, V.; Hazelton, D.W.; Motowidlo, L. R.; Krahula, F.; Hoehn, James G.; Walker, M. S.; Haldar, Pradeep

doi:10.1007/s11837-998-0347-x

Cited by 23 publications

(18 citation statements)

References 27 publications

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“…[1,2]. Among these superconductor systems, YBa 2 Cu 3 O 7Àx (YBCO) is one of the most promising materials for applications in high magnetic fields, and has been widely studied for use in wire technologies for power applications, microwave passive components and some magnet applications [3].…”

Section: Introductionmentioning

confidence: 99%

Three dimensional analyses of flux pinning centers in Dy-doped YBa2Cu3O7−x coated superconductors by STEM tomography

Ortalan

Herrera

Rupich

et al. 2009

Physica C: Superconductivity

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Section: Introductionmentioning

confidence: 99%

Three dimensional analyses of flux pinning centers in Dy-doped YBa2Cu3O7−x coated superconductors by STEM tomography

Ortalan

Herrera

Rupich

et al. 2009

Physica C: Superconductivity

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…”

mentioning

confidence: 99%

Strongly enhanced current densities in superconducting coated conductors of YBa₂Cu₃O_7−x + BaZrO₃

MacManus‐Driscoll

FOLTYN²,

Jia³

et al. 2010

Materials for Sustainable Energy

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There are numerous potential applications for superconducting tapes, based on YBa 2 Cu 3 O 7-x (YBCO) films coated onto metallic substrates [1]. A long established goal of more than 15 years has been to understand the magnetic flux pinning mechanisms which allow films to maintain high current densities out to high magnetic fields [2]. In fact, films carry 1-2 orders of magnitude higher current densities than any other form of the material [3]. For this reason, the idea of further improving pinning has received little attention. Now that commercialisation of conductors is much closer, for both better performance and lower fabrication costs, an important goal is to achieve enhanced pinning in a practical way. In this work, we demonstrate a simple and industrially scaleable route which yields a 1.5 to 5-fold improvement in the in-field current densities of already-high-quality conductors.The sources of enhanced pinning in vapour-grown YBCO films are the natural point, line and volume imperfections, probably the most significant of these being the dislocations perpendicular to the substrate plane of film [4]. In terms of dimensionality, dislocations are nearly ideal for pinning magnetic flux lines. However, the density of dislocations is dominated by the growth island size and their spacing is estimated to be rather large (~100 nm-~500 nm) [3,5]. To increase dislocation density, an obvious way would be to decrease the island size which the dislocations bound [6], e.g. by reducing growth temperature, but this is non-trivial because the crystalline quality of the film would be compromised.Heavy ion irradiation has been shown to reduce vortex mobility [7,8] but it is impractical for treatment of coated conductors. Other work involving growth of films on mis-cut single crystal substrates has demonstrated that introduction of columnar growth defects improves J c (77K) by up to 50%, but only at a particular field orientation and magnitude [9]. Other ideas for improving pinning are introduction of defects by multi-layering or addition of particles on the substrate surface [5,10]. Using these methods some improvements appear possible in thin films on single crystal substrates.In this work, prompted by our earlier report that suggested the possibility of enhanced pinning in the presence of epitaxial second phases [11], we study BaZrO 3 additions to YBCO. The main reasons for the choice of BaZrO 3 are a) while it can grow heteroepitaxially with YBCO it has a large lattice mismatch (~ 9%) so strain between the 2 phases could introduce defects for enhanced pinning, b) it is a high melting temperature phase and so growth kinetics should be slow, leading to small particles, and c) Zr does not substitute in the YBCO structure [12]. Indeed, single crystals of YBCO are often grown in BaZrO 3 -coated crucibles [13]. BaZrO 3 has also been previously investigated as a pinning centre in bulk, melt processed YBCO [14,15]. However, it was found that the BaZrO 3 agglomerated at the growth fronts of the grains, and, because of heteroepitaxi...

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“…The main process parameters involved in the synthesis of wires thus include precursor material synthesis, mechanical processing, and heat treatment conditions. The precursor composition, particle size, and density are important factors in the quality of precursor material synthesis (51). Billet dimensions, filament restacking geometry, and mechanical properties of the tape are the important mechanical aspects for wires and tapes of HTS.…”

Section: Opit Methods For Bscco 2212 and 2223 Superconducting Wires Lmentioning

confidence: 99%

“…Fill factor is one of the critical parameters in HTS wires, defined as the ratio of the volume of the superconductor core to the entire volume of the conductor. Typical fill factor in most HTS conductors to date is below 60% (51). Magneto-optic studies indicate that most of the current transport occurs at the interfacial region between silver and the bulk BSCCO rather than in the bulk BSCCO (52).…”

Section: Opit Methods For Bscco 2212 and 2223 Superconducting Wires Lmentioning

confidence: 99%

Superconductors: Processing of High‐ T _C Bulk, Thin Film, and Wires

Subramanyam

Boolchand

1999

Wiley Encyclopedia of Electrical and Electronics Engineering

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The sections in this article are Properties of High‐Temperature Superconductors Processing of High‐Temperature Superconductors Processing of Bulk Superconductors Characterization of Bulk Superconductors Processing of Hts Thin Films Processing of Superconducting Wires and Tapes Applications of High‐Temperature Superconductors

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High-temperature superconductors for electric power and high-energy physics

Cited by 23 publications

References 27 publications

Three dimensional analyses of flux pinning centers in Dy-doped YBa2Cu3O7−x coated superconductors by STEM tomography

Three dimensional analyses of flux pinning centers in Dy-doped YBa2Cu3O7−x coated superconductors by STEM tomography

Strongly enhanced current densities in superconducting coated conductors of YBa₂Cu₃O_7−x + BaZrO₃

Superconductors: Processing of High‐ T _C Bulk, Thin Film, and Wires

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High-temperature superconductors for electric power and high-energy physics

Cited by 23 publications

References 27 publications

Three dimensional analyses of flux pinning centers in Dy-doped YBa2Cu3O7−x coated superconductors by STEM tomography

Three dimensional analyses of flux pinning centers in Dy-doped YBa2Cu3O7−x coated superconductors by STEM tomography

Strongly enhanced current densities in superconducting coated conductors of YBa2Cu3O7−x + BaZrO3

Superconductors: Processing of High‐ T C Bulk, Thin Film, and Wires

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Strongly enhanced current densities in superconducting coated conductors of YBa₂Cu₃O_7−x + BaZrO₃

Superconductors: Processing of High‐ T _C Bulk, Thin Film, and Wires