Recent advances in bismuth-based superconductors

Iyer, A. N.; Huang, Jianfeng; Jammy, R.; Haldar, Pradeep; Hoehn, James G.; Galinski, G.; Motowidlo, L. R.

doi:10.1007/bf03222657

Cited by 21 publications

(13 citation statements)

References 6 publications

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“…Whereas the solutions of pristine GdBCO and GdBCO with Hf(acac) 4 show very similar IR spectra, the spectrum of the GdBCO Hf-acac+liquid acac solution shows additional bands (black arrows). This means, firstly, that these bands are caused by the presence of acac in the solution and secondly that the acac that is introduced in the solution by the addition of the initial Hf(acac) 4 salt is removed during the solution preparation.…”

Section: Solution Characterizationmentioning

confidence: 99%

Large critical current densities and pinning forces in CSD-grown superconducting GdBa₂Cu₃O_7−x-BaHfO₃nanocomposite films

Cayado

Erbe

Kauffmann-Weiss

et al. 2017

Supercond. Sci. Technol.

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GdBa 2 Cu 3 O 7 x -BaHfO 3 (GdBCO-BHO) nanocomposite (NC) films containing 12 mol% BHO nanoparticles were prepared by chemical solution deposition (CSD) following the TFA route on SrTiO 3 (STO) single crystals and buffered metallic tapes supplied by two different companies: Deutsche Nanoschicht GmbH and SuperOx. We optimized the preparation of our GdBCO-BHO solutions with acetylacetone making the film synthesis very robust and reproducible, and obtained 220 nm films with excellent superconducting properties. We show the structural, morphological and superconducting properties of the films after a careful optimization of the processing parameters (growth temperature, oxygen partial pressure and heating ramp). The films reach critical temperatures (T c ) of ∼94 K, self-field critical current densities (J c ) of >7 MA cm 2 and maximum pinning force densities (F p ) of ∼16 GN m 3 at 77 K on STO and T c of ∼94.5 K and J c > 1.5 MA cm 2 on buffered metallic tapes. The transport properties under applied magnetic fields are significantly improved with respect to the pristine GdBCO films. The GdBCO-BHO NC films on STO present epitaxial c-axis orientation with excellent out-of-plane and in-plane texture. The films are, in general, very dense with a low amount of pores and only superficial indentations. On the other hand, we present, for the first time, a systematic study of CSD-grown GdBCO-BHO NC films on buffered metallic tapes. We have used the optimized growth conditions for STO as a reference and identified some limitations on the film synthesis that should be overcome for further improvement of the films' superconducting properties.

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Section: Solution Characterizationmentioning

confidence: 99%

Large critical current densities and pinning forces in CSD-grown superconducting GdBa₂Cu₃O_7−x-BaHfO₃nanocomposite films

Cayado

Erbe

Kauffmann-Weiss

et al. 2017

Supercond. Sci. Technol.

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“…Superconductor wire was prepared by the PIT method [1]. The powders were packed into Ag tubes that were then made into tapes ∼300 µm thick and 3 m long by drawing and rolling.…”

Section: Methodsmentioning

confidence: 99%

“…Ag-clad Bi 2 Sr 2 Ca 2 Cu 3 O 10+x (Bi-2223) tapes are promising high-temperature superconductors and have been fabricated in lengths exceeding 850 m and exhibit critical current density (J c ) values of 12 000 A cm −2 at 77 K in zero applied field [1]. However, the current-carrying capacity of these tapes in high magnetic field is limited by thermally activated flux motion.…”

Section: Introductionmentioning

confidence: 99%

Liquid phase sintering and microstructure development of Ag-clad Tl-1223 superconductor

Hagen

Kupperman

Goretta

et al. 1996

Supercond. Sci. Technol.

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The phase evolution and electrical properties of Tl-1223 tapes were explored near the incongruent melt temperature. Liquid phase evolution was monitored as a function of time and temperature by an acoustic velocity monitor. The phase development kinetics for Tl-based superconductors are more than one order of magnitude faster than the kinetics of Bi-based superconductors. Three separate powder mixtures (Tl

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“…The powder-in-tube (PIT) process for the Ag-clad Bi-2223 system is a promising and industrially scalable technique for fabricating long-length superconductors. Although considerable progress has been made recently in fabricating PIT tapes and enhancing their critical-current density (J c ) values, the complexities involved in obtaining phase purity, crystal orientation, good intergranular connectivity and sufficient mechanical strength in a brittle multicomponent oxide have long impeded the successful commercialization of high-T c superconductors [1][2][3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Two-Step Polyimide Curing Technique for Flexible Plastic Liquid Crystal Devices

Kim

et al. 2009

jjap

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Development of high-temperature superconductor technology will make possible the design and fabrication of smaller, lighter and more efficient power devices such as motors, generators, transformers, transmission cables and fault-current limiters. A prototype fault-current limiter, a 200 hp motor and a 50 m long transmission cable have already been demonstrated using Ag-clad Bi-2223 superconductor tapes. We have recently enhanced the transport current properties of long lengths of multifilament Ag-clad Bi-2223 tapes through increased packing density of precursor powder, improved mechanical deformation, optimization of conductor design and adjusted cooling rate. These improved processing parameters had a pronounced effect on the transport critical current of the superconducting tapes. Our improvements are briefly discussed and their implications are assessed in this paper.

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Recent advances in bismuth-based superconductors

Cited by 21 publications

References 6 publications

Large critical current densities and pinning forces in CSD-grown superconducting GdBa₂Cu₃O_7−x-BaHfO₃nanocomposite films

Large critical current densities and pinning forces in CSD-grown superconducting GdBa₂Cu₃O_7−x-BaHfO₃nanocomposite films

Liquid phase sintering and microstructure development of Ag-clad Tl-1223 superconductor

Two-Step Polyimide Curing Technique for Flexible Plastic Liquid Crystal Devices

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Recent advances in bismuth-based superconductors

Cited by 21 publications

References 6 publications

Large critical current densities and pinning forces in CSD-grown superconducting GdBa2Cu3O7−x-BaHfO3nanocomposite films

Large critical current densities and pinning forces in CSD-grown superconducting GdBa2Cu3O7−x-BaHfO3nanocomposite films

Liquid phase sintering and microstructure development of Ag-clad Tl-1223 superconductor

Two-Step Polyimide Curing Technique for Flexible Plastic Liquid Crystal Devices

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Product

Resources

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Large critical current densities and pinning forces in CSD-grown superconducting GdBa₂Cu₃O_7−x-BaHfO₃nanocomposite films

Large critical current densities and pinning forces in CSD-grown superconducting GdBa₂Cu₃O_7−x-BaHfO₃nanocomposite films