Misalignment angles’ reduction in Bi2212 multifilaments melted by dynamic heat treatment under a magnetic field

Villaume, A.; Bourgault, D.; Porcar, Laureline; Girard, A.; Bruzek, Christian-Éric; Sibeud, Pierre-Frédéric

doi:10.1088/0953-2048/20/7/018

Cited by 7 publications

(4 citation statements)

References 19 publications

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“…A dynamic process has been developed to texture long wires by continuously moving them in a perpendicular magnetic field of 5 T at a velocity adapted to the temperature profile of the furnace. The critical current increased by 40% to 630 A and the critical current density attains 190 kA cm −2 at 4.2 K [45].…”

Section: Bi 2212mentioning

confidence: 96%

Texturing by cooling a metallic melt in a magnetic field

Tournier

Beaugnon

2009

Science and Technology of Advanced Materials

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Processing in a magnetic field leads to the texturing of materials along an easy-magnetization axis when a minimum anisotropy energy exists at the processing temperature; the magnetic field can be applied to a particle assembly embedded into a liquid, or to a solid at a high diffusion temperature close to the melting temperature or between the liquidus and the solidus temperatures in a region of partial melting. It has been shown in many experiments that texturing is easy to achieve in congruent and noncongruent compounds by applying the field above the melting temperature T m or above the liquidus temperature of alloys. Texturing from a melt is successful when the overheating temperature is just a few degrees above T m and fails when the processing time above T m is too long or when the overheating temperature is too high; these observations indicate the presence of unmelted crystals above T m with a size depending on these two variables that act as growth nuclei. A recent model that predicts the existence of unmelted crystals above the melting temperature is used to calculate their radius in a bismuth melt.

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Section: Bi 2212mentioning

confidence: 96%

Texturing by cooling a metallic melt in a magnetic field

Tournier

Beaugnon

2009

Science and Technology of Advanced Materials

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“…The tape is composed of 78 filaments embedded in a Ag-Mg (0.2% Mg) sheath [35]. The tapes are different from the ones before.…”

Section: Magnetic Field Texturing Of 2212 Tapes Using a Continuous DImentioning

confidence: 99%

“…The authors thank the Institute of Physics Publishing, IOP publishing, Taylor and Francis Group Journals, Elsevier for giving the authorization to reproduce Figure 1 and 2 as published in [16], Figure 4 as published in [23], Figure 6 as published in [26], Figure 7 as published in [34], Figure 8 and 9 as published in [35] and Figure 10 as published in [38].…”

Section: Acknowledgmentsmentioning

confidence: 99%

Magnetic Texturing of High-Tc Superconductors

Porcar¹,

Rango²,

Bourgault³

et al. 2012

Superconductors - Materials, Properties and Applications

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“…On the mesoscale, interfilamentary bridging and radial c-axis texturing of grain colonies are important factors. Within individual filaments, porosity and the phase assemblage are the primary challenges [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Formation of Bi₂Sr₂CaCu₂O_x/Ag multifilamentary metallic precursor powder-in-tube wires

Zhang

Koch

Schwartz

2016

Supercond. Sci. Technol.

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Previously, a metallic precursor (MP) approach to synthesizing Bi2Sr2CaCu2Ox (Bi2212), with a homogeneous mixture of Bi, Sr, Ca, Cu and Ag was produced by mechanical alloying. Here, Bi2212/Ag round multifilamentary wire is manufactured using a metallic precursor powder-in-tube (MPIT) process. The MP powders were packed into a pure Ag tube in an Ar atmosphere and then sealed. After deformation, multifilamentary round wires and rolled tapes were heat treated in flowing oxygen through three stages: oxidation, conversion and partial-melt processing (PMP). Processing-microstructure-property relationships on 20–50 mm long multifilamentary round wires and rolled tapes were studied extensively. It is shown that conventional wire deformation processes, optimized for oxide-powder-in-tube wires, are not effective for deforming MPIT wires, and that as with prior studies of MPIT Bi2Sr2Ca2Cu3Oy conductors, hot extrusion is required for obtaining a multifilamentary structure with fine filaments. As a result, the Bi2212 MPIT wires reported here have low engineering critical current density. Nonetheless, by focusing on sections of wires that remain intact after deformation, it is also shown that the first heat treatment stage, the oxidation stage, plays a crucial role in chemical homogeneity, phase transformation, and microstructural evolution and three reaction pathways for MP oxidation are presented. Furthermore, it is found the Bi2212 grain alignment within an MPIT filament is significantly different from that found in OPIT filaments after PMP, indicating the formation of highly dense filaments containing Bi2212 fine grains and Ag particles before PMP aids the formation of large, c-axis textured Bi2212 filaments during PMP. These results show that, with improved wire deformation, high critical current density may be obtained via a MPIT process.

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Misalignment angles’ reduction in Bi2212 multifilaments melted by dynamic heat treatment under a magnetic field

Cited by 7 publications

References 19 publications

Texturing by cooling a metallic melt in a magnetic field

Texturing by cooling a metallic melt in a magnetic field

Magnetic Texturing of High-Tc Superconductors

Formation of Bi₂Sr₂CaCu₂O_x/Ag multifilamentary metallic precursor powder-in-tube wires

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Misalignment angles’ reduction in Bi2212 multifilaments melted by dynamic heat treatment under a magnetic field

Cited by 7 publications

References 19 publications

Texturing by cooling a metallic melt in a magnetic field

Texturing by cooling a metallic melt in a magnetic field

Magnetic Texturing of High-Tc Superconductors

Formation of Bi2Sr2CaCu2Ox/Ag multifilamentary metallic precursor powder-in-tube wires

Contact Info

Product

Resources

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Formation of Bi₂Sr₂CaCu₂O_x/Ag multifilamentary metallic precursor powder-in-tube wires