Gibbons Warns of Decline in R&amp;D

Lawler, Andrew

doi:10.1126/science.274.5294.1830

Cited by 33 publications

(48 citation statements)

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“…In recent years much effort has been expended towards fabricating long, flexible, high T c superconductor coated conductors with high critical current densities for electrical industry applications. One of the most successful approaches to date is the rolling assisted biaxially textured substrates (RABiTS) technique [1,2]. In this technique, biaxially textured Ni tapes are prepared by cold rolling and annealing, upon which high quality epitaxial oxide buffer layers and YBCO films can be grown.…”

Section: Introductionmentioning

confidence: 99%

Preparation of highJ_cYBCO coated conductors on non-magnetic Ni–W substrates

Spagnoal¹,

Bhattacharya²,

Ren³

2004

J. Phys. D: Appl. Phys.

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We report on the preparation of high J c YBCO coated conductors on non-magnetic Ni-W substrates. In order to minimize the deleterious effects of tungsten oxide formation on the epitaxial growth of oxide buffer layers and YBCO films, an electrodeposition approach has been developed to epitaxially grow an about 2 µm Ni layer (Ed-Ni layer) on Ni-3 at% W tapes. With this method, the surface for epitaxy of the first oxide seed layer is not exposed to the Ni-W surface, and high quality CeO 2 /yttria-stabilized zirconia/CeO 2 buffer layers and YBCO films have been grown on the Ed-Ni/Ni-3 at% W substrates by pulsed laser deposition. A critical current density, J c , of 1.49 MA cm −2 has been achieved at 75.2 K and in a magnetic field of 83 mT.

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Section: Introductionmentioning

confidence: 99%

Preparation of highJ_cYBCO coated conductors on non-magnetic Ni–W substrates

Spagnoal¹,

Bhattacharya²,

Ren³

2004

J. Phys. D: Appl. Phys.

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“…This technique involves the formation of a crystallographic texture by cold rolling deformation and a subsequent recrystallization of the substrate at high temperatures. It has been shown that nickel tapes are well suited for the RABiTS approach [5]. Nickel forms a sharp {100} 001 cube texture after deformation and recrystallization at around 1000 • C. Nickel alloys (such as Ni-V, Ni-W, Ni-Cr or ternary alloys) are advantageous over pure nickel as the alloys show highly improved tensile strengths as well as strongly reduced ferromagnetism.…”

Section: Introductionmentioning

confidence: 99%

Improved grain boundary currents in textured YBa₂Cu₃Othin films on bicrystalline Ni substrates

Guth¹,

Born²,

Brandt³

et al. 2003

Supercond. Sci. Technol.

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Using magneto optical imaging a comparative study of YBa 2 Cu 3 O δ thin films grown on Gd-10at% doped CeO 2 buffered Ni and SrTiO 3 bicrystals with tilt angles ranging from 3 • to 16 • has been made. The Ni substrates have been chosen as a model system for the RABiTS coated conductor technology. It is found that the YBa 2 Cu 3 O δ grain boundaries on Ni exhibit improved superconducting transport properties, while for the intra-granular critical currents a moderate decrease is observed. The improved J gb /J c ratio could be detected for all studied grain boundary angles as well as over the whole accessible temperature range from 8 to 60 K. Extensive x-ray measurements on the in-and out-of-plane texture of all layers have been performed to explain the change in the intra-and inter-granular critical currents.

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“…YBa 2 Cu 3 O 7−x (YBCO) coated conducting wires have attracted large interest in recent years because of their potential applications in the electric power industry [1][2][3][4][5]. To carry high critical current density (J c ), superconducting thin film must be well textured to minimize weak links at high-angle grain boundaries in the film [6,7].…”

Section: Introductionmentioning

confidence: 99%

“…Several methods have been explored for the fabrication of biaxially textured templates on polycrystalline substrates [2,[10][11][12][13]. Ion-beam-assisted deposition (IBAD) has been successfully used to fabricate biaxially textured yttriastabilized zirconia (YSZ) films on polished metallic substrates [5,12,13]. The YSZ layer served as a template for epitaxial 3 Author to whom correspondence should be addressed: 9700 S. Cass Avenue, Argonne, IL 60439, USA.…”

Section: Introductionmentioning

confidence: 99%

Pulsed laser deposition of YBCO thin films on IBAD YSZ substrates

Koritala

et al. 2002

Supercond. Sci. Technol.

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High-quality YBa 2 Cu 3 O 7−x (YBCO) films were fabricated on yttria-stabilized zirconia (YSZ)-buffered Hastelloy C276 substrates by pulsed laser deposition. YSZ was grown by ion-beam-assisted deposition. A thin (≈10 nm) CeO 2 layer was deposited before the deposition of YBCO. The crystalline structure and biaxial texture of the YBCO film and the buffer layer were examined by x-ray diffraction 2θ -scan, φ-scan and pole-figure analysis. Epitaxial growth of the YBCO film on the buffer layer was observed. Full width at half maximum (FWHM) value of 7.4 • was measured from the φ-scan of YBCO(103). Raman spectroscopy showed compositional uniformity and phase integrity in the YBCO films. Surface morphologies of the YBCO films were examined by scanning electron microscopy. Comparative studies indicated that the CeO 2 buffer layer significantly improves the structural alignment and superconducting properties of YBCO films. T c = 90 K, with sharp transition, and transport J c = 2.2 × 10 6 A cm −2 at 77 K in zero-external field were obtained on the 0.5 µm thick YBCO films. The dependence of J c on the FWHM of the YBCO(103) φ-scan indicated that high J c is associated with low FWHM.

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Gibbons Warns of Decline in R&D

Cited by 33 publications

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Preparation of highJ_cYBCO coated conductors on non-magnetic Ni–W substrates

Preparation of highJ_cYBCO coated conductors on non-magnetic Ni–W substrates

Improved grain boundary currents in textured YBa₂Cu₃Othin films on bicrystalline Ni substrates

Pulsed laser deposition of YBCO thin films on IBAD YSZ substrates

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Gibbons Warns of Decline in R&D

Cited by 33 publications

References 0 publications

Preparation of highJcYBCO coated conductors on non-magnetic Ni–W substrates

Preparation of highJcYBCO coated conductors on non-magnetic Ni–W substrates

Improved grain boundary currents in textured YBa2Cu3O thin films on bicrystalline Ni substrates

Pulsed laser deposition of YBCO thin films on IBAD YSZ substrates

Contact Info

Product

Resources

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Preparation of highJ_cYBCO coated conductors on non-magnetic Ni–W substrates

Preparation of highJ_cYBCO coated conductors on non-magnetic Ni–W substrates

Improved grain boundary currents in textured YBa₂Cu₃Othin films on bicrystalline Ni substrates