Recent progress in high-temperature superconductors at Intermagnetics General Corporation

Motowidlo, L. R.; Selvamanickam, V.; Galinski, G.; Vo, N. V.; Haldar, Pradeep; Sokolowski, R.S.

doi:10.1016/s0921-4534(00)00140-4

Cited by 20 publications

(10 citation statements)

References 8 publications

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“…Al 2 O 3 , CeO 2 , SiO 2 , Y 2 O 3 , ZrO 2 , CaZrO 3 , and SrZrO 3 were identified as non-reactive when heat treated in contact with Bi2212, whereas Fe 2 O 3 , MgO, and NiO, reacted with Cu that diffused through the Ag during heat treatment. Motowidlo et al [37][38][39] fabricated Bi2212 RW with various DS Ag sheath alloys, including Ag/Al. They reported improvements in process control and fabrication that resulted in less porosity and more uniform filaments.…”

Section: Introductionmentioning

confidence: 99%

High strength oxide dispersion strengthened silver aluminum alloys optimized for Bi₂Sr₂CaCu₂O_8+xround wire

Kajbafvala¹,

Nachtrab²,

Kumar³

et al. 2013

Supercond. Sci. Technol.

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High strength dispersion strengthened (DS) Ag/Al alloys with various Al content are studied as candidates for sheathing Bi 2 Sr 2 CaCu 2 O 8+x (Bi2212) wire. The Ag/Al alloys are fabricated by powder metallurgy and internally oxidized in pure oxygen. The time and temperature of the internal oxidation heat treatment is varied to maximize the strength after undergoing the Bi2212 partial melt process (PMP). Vickers micro-hardness number (HVN), room temperature tensile behavior, optical and scanning electron microscopy, ion channeling contrast imaging using a focused ion beam and electrical resistivity measurements are used to characterize the alloys. An Ag/0.2wt%Mg (Ag/Mg) alloy is used for comparison. Results show that internal oxidation at 650-700 • C for 4 h produces the highest HVN for the DS Ag/Al alloy; when oxidized at 675 • C for 4 h the HVN, yield strength and tensile strength of the DS Ag/Al are 50% higher than the corresponding values of Ag/Mg. Microstructural observations show that Al 2 O 3 precipitates play the main role in strengthening the DS Ag/Al alloy. The alloy retains its fine grain structure and strength after PMP heat treatment.

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Section: Introductionmentioning

confidence: 99%

High strength oxide dispersion strengthened silver aluminum alloys optimized for Bi₂Sr₂CaCu₂O_8+xround wire

Kajbafvala¹,

Nachtrab²,

Kumar³

et al. 2013

Supercond. Sci. Technol.

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“…In recent years, the development of second-generation high-temperature superconducting tapes, namely coated conductors, has attracted much attention in the area of the applications of high-temperature superconductivity (HTS). [1][2][3][4] One of the key issues is the preparation of biaxially textured buffer layer(s), which act(s) as a template for the epitaxial deposition of the YBa 2 Cu 3 O 7−y (YBCO) superconductor. In addition to being a diffusion barrier, 5 the buffer layer provides sufficient crystalline texture to the HTS layer to alleviate the problems related to weak-linked, high-angle grain boundaries.…”

Section: Introductionmentioning

confidence: 99%

Possible new single-buffer layers for YBa₂Cu₃O₇₋_y coated conductors prepared by chemical solution deposition

Guo

Zhou

et al. 2007

J. Mater. Res.

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New single-buffer layers of YBiO3 and SmBiO3 have been proposed for YBa2Cu3O7−y (YBCO) and SmBa2Cu3O7−y coated conductors. Highly c-axis oriented YBiO3 and SmBiO3 buffer layers have been deposited on single-crystal LaAlO3 and SrTiO3, respectively, by a low-cost chemical solution deposition method in a temperature range as low as 730 to 800 °C in air. Precursor solution of yttrium nitrate, samarium nitrate, and bismuth nitrate has been deposited using spin coating and heat treated in air in a single stage to yield textured YBiO3 and SmBiO3 buffers. A very dense, smooth, pinhole-free, and crack-free morphology has been observed for both buffers. Dense, homogeneous, and epitaxially grown YBCO film with thickness about 300 nm has been obtained on YBiO3 buffer with onset critical temperature 90 K and Jc (77 K, self-field) over 3 MA/cm2. These results offer an effective alternative to prepare desirable buffer layer(s) for YBCO-coated conductors.

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“…Recently, worldwide attention has been paid to the preparation of YBa 2 Cu 3 O 7-d (YBCO)-based coated conductors, i.e., the second generation tapes because of their wideranging potential in large-scale application such as superconducting maglev trains and superconducting electric cables [1][2][3][4][5][6][7]. The major approaches for fabricating YBCO-coated conductors include in situ processes like pulse laser deposition (PLD), magnetic sputtering, etc., as well as ex situ wet-chemistry approaches.…”

Section: Introductionmentioning

confidence: 99%

Fe-doped epitaxial YBCO films prepared by chemical solution deposition

et al. 2014

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YBa 2 Cu 3 O 7-d (YBCO)-coated conductors have wide-ranging potential in large-scale applications such as superconducting maglev trains and superconducting electric cables, but low current carrying capability restrains the practical application of YBCO-coated conductors at high temperatures and high magnetic fields. It is crucial to develop YBCO-coated conductors with high critical current density. In this paper, epitaxial, dense, smooth, and crack-free Fe-doped YBCO films were prepared on a LaAlO 3 single crystal substrate via a fluorine-free polymerassisted metal organic deposition method. The effects of the dilute Fe doping on microstructure and superconducting character of YBCO films were investigated. The critical temperature for superconducting of the Fe-doped YBCO films decreases slightly. However, the in-field critical current density of YBCO films improves with dilute Fe doping of amounts less than x = 0.005, compared to the pure YBCO film. Therefore, the current carrying capability of YBCO film can improve by doping with appropriate amounts of Fe. This means that dilute Fe doping in YBCO films may be a feasible way to prepare high-performance coated conductors.

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Recent progress in high-temperature superconductors at Intermagnetics General Corporation

Cited by 20 publications

References 8 publications

High strength oxide dispersion strengthened silver aluminum alloys optimized for Bi₂Sr₂CaCu₂O_8+xround wire

High strength oxide dispersion strengthened silver aluminum alloys optimized for Bi₂Sr₂CaCu₂O_8+xround wire

Possible new single-buffer layers for YBa₂Cu₃O₇₋_y coated conductors prepared by chemical solution deposition

Fe-doped epitaxial YBCO films prepared by chemical solution deposition

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Recent progress in high-temperature superconductors at Intermagnetics General Corporation

Cited by 20 publications

References 8 publications

High strength oxide dispersion strengthened silver aluminum alloys optimized for Bi2Sr2CaCu2O8+xround wire

High strength oxide dispersion strengthened silver aluminum alloys optimized for Bi2Sr2CaCu2O8+xround wire

Possible new single-buffer layers for YBa2Cu3O7−y coated conductors prepared by chemical solution deposition

Fe-doped epitaxial YBCO films prepared by chemical solution deposition

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High strength oxide dispersion strengthened silver aluminum alloys optimized for Bi₂Sr₂CaCu₂O_8+xround wire

High strength oxide dispersion strengthened silver aluminum alloys optimized for Bi₂Sr₂CaCu₂O_8+xround wire

Possible new single-buffer layers for YBa₂Cu₃O₇₋_y coated conductors prepared by chemical solution deposition