Effects of carbon concentration and filament number on advanced internal Mg infiltration-processed MgB<sub>2</sub>strands

Li, G Z; Sumption, M.D.; Zwayer, J B; Susner, Michael A.; Rindfleisch, M.; Thong, C J; Tomsic, M.; Collings, E. W.

doi:10.1088/0953-2048/26/9/095007

Cited by 58 publications

(74 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The materials with the lowest c / DSc are polycrystalline materials, including MgB2 [81] and A15 materials [66,67,82,83]. Although removing high angle grain boundaries from technological polycrystalline materials is the favoured route to increase c , so far, this approach has proven very expensive.…”

Section: Resultsmentioning

confidence: 99%

The cause of ‘weak-link’ grain boundary behaviour in polycrystalline Bi₂Sr₂CaCu₂O₈and Bi₂Sr₂Ca₂Cu₃O₁₀superconductors

Wang

Raine

Hampshire

2018

Supercond. Sci. Technol.

View full text Add to dashboard Cite

Publisher's copyright statement:Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. Manuscript version: Accepted Manuscript Accepted Manuscript is "the version of the article accepted for publication including all changes made as a result of the peer review process, and which may also include the addition to the article by IOP Publishing of a header, an article ID, a cover sheet and/or an 'Accepted Manuscript' watermark, but excluding any other editing, typesetting or other changes made by IOP Publishing and/or its licensors"This Accepted Manuscript is © 2017 IOP Publishing Ltd.As the Version of Record of this article is going to be / has been published on a gold open access basis under a CC BY 3.0 licence, this Accepted Manuscript is available for reuse under a CC BY 3.0 licence immediately.Everyone is permitted to use all or part of the original content in this article, provided that they adhere to all the terms of the licence https://creativecommons.org/licences/by/3.0Although reasonable endeavours have been taken to obtain all necessary permissions from third parties to include their copyrighted content within this article, their full citation and copyright line may not be present in this Accepted Manuscript version. Before using any content from this article, please refer to the Version of Record on IOPscience once published for full citation and copyright details, as permissions may be required. All third party content is fully copyright protected and is not published on a gold open access basis under a CC BY licence, unless that is specifically stated in the figure caption in the Version of Record.View the article online for updates and enhancements. AbstractThe detrimental effects of grain boundaries have long been considered responsible for the low critical current densities ( c ) in high temperature superconductors. In this paper, we apply the quantitative approach used to identify the cause of the 'weak-link' grain boundary behaviour in YBa2Cu3O7 [1], to the Bi2Sr2CaCu2O8 and Bi2Sr2Ca2Cu3O10 materials that we have fabricated. Magnetic and transport measurements are used to characterise the grain and grain boundary properties of micro-and nanocrystalline material. Magnetisation measurements on all nanocrystalline materials show non-Bean-like behaviour and are consistent with sur...

show abstract

Section: Resultsmentioning

confidence: 99%

The cause of ‘weak-link’ grain boundary behaviour in polycrystalline Bi₂Sr₂CaCu₂O₈and Bi₂Sr₂Ca₂Cu₃O₁₀superconductors

Wang

Raine

Hampshire

2018

Supercond. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…Currently, MgB 2 wires and tapes are prepared by several techniques, e.g., powderin-tube (PIT) method [73], the internal Mg infiltration process (AIMI) [74], and the formation of thin layers. The highest J c values in high magnetic fields are obtained for in situ MgB 2 wires, e.g., undoped MgB 2 wires which have J c of 1000 A/mm 2 in 4 T at 4.2 K and 100 A/mm 2 in 6.2 T at 4.2 K [75], and C-doped MgB 2 wire has J c of 1000 A/mm 2 in 7 T at 4.2 K [75].…”

Section: Physical Properties and Pinning Centers In Mgb 2 Wiresmentioning

confidence: 99%

Analysis Method of High-Field Pinning Centers in NbTi Wires and MgB2 Wires

Gajda

2018

J Low Temp Phys

View full text Add to dashboard Cite

The main purpose of this article is to show an easier and more accurate method for analyzing high-field pinning centers. Previous methods did not allow for precise analysis and research on high-field pinning centers, they studied only the dominant pinning mechanism, and they required a maximum of pinning force (F pmax) to analyze pinning centers. The main advantage of this method can be used in samples without the maximum pinning force required by other methods to analyze the pinning mechanism. In addition, this method allows us to observe even small changes in the density of individual pinning centers. This method is based on analysis of critical current density values in different ranges of reduced magnetic field. The method of analysis of highfield pinning centers allows primarily to develop methods and directions for creation of high-field pinning centers. The surface pinning centers are strong pinning centers in low magnetic fields and very weak pinning centers in middle and high magnetic fields. Additionally, the analysis of pinning centers shows that dislocations, strains, substitutions in the crystal lattice, and precipitation inside the grains create strong pinning centers in high magnetic fields and very weak pinning centers in low and middle magnetic fields. Research indicates that strains, substitutions in the crystal lattice, and precipitates inside grains form pinning centers that operate in the high magnetic field range.

show abstract

“…We acknowledge support by Deutsche Forschungsgemeinschaft and Open Access Publishing Fund of Karlsruhe Institute of Technology. [15], Fe(Se,Te) on RABiTS [21], YBCO coated conductor [40], MgB2 [41], NbTi [42,43], and Nb3Sn [44,45] The FWHM value of out-of-plane diffraction (i.e., tilting of crystallites) is ∆ωBa122 = 1.2 • , which is comparable to that of the previous study [S2], whereas that (∆φBa122 = 5.7 • ) of in-plane diffraction (i.e., twisting of crystallites) is slightly improved from that (∆φBa122 = 8 • ) of the previous study mainly because of higher growth temperature employed in this study [S1, S2]. The ∆φBa122 = 5.7 • is smaller than that of IBAD-MgO (∆φMgO = 8 • ) due probably to self epitaxy effect during PLD growth of the Ba-122 film.…”

Section: In-plane Transport Measurementsmentioning

confidence: 99%

High-field transport properties of a P-doped BaFe2As2 film on technical substrate

Iida

Sato

Tarantini

et al. 2017

Sci Rep

View full text Add to dashboard Cite

High temperature (high-Tc) superconductors like cuprates have superior critical current properties in magnetic fields over other superconductors. However, superconducting wires for high-field-magnet applications are still dominated by low-Tc Nb3Sn due probably to cost and processing issues. The recent discovery of a second class of high-Tc materials, Fe-based superconductors, may provide another option for high-field-magnet wires. In particular, AEFe2As2 (AE: Alkali earth elements, AE-122) is one of the best candidates for high-field-magnet applications because of its high upper critical field, Hc2, moderate Hc2 anisotropy, and intermediate Tc. Here we report on in-field transport properties of P-doped BaFe2As2 (Ba-122) thin films grown on technical substrates by pulsed laser deposition. The P-doped Ba-122 coated conductor exceeds a transport Jc of 105 A/cm2 at 15 T for main crystallographic directions of the applied field, which is favourable for practical applications. Our P-doped Ba-122 coated conductors show a superior in-field Jc over MgB2 and NbTi, and a comparable level to Nb3Sn above 20 T. By analysing the E − J curves for determining Jc, a non-Ohmic linear differential signature is observed at low field due to flux flow along the grain boundaries. However, grain boundaries work as flux pinning centres as demonstrated by the pinning force analysis.

show abstract

Effects of carbon concentration and filament number on advanced internal Mg infiltration-processed MgB₂strands

Cited by 58 publications

References 34 publications

The cause of ‘weak-link’ grain boundary behaviour in polycrystalline Bi₂Sr₂CaCu₂O₈and Bi₂Sr₂Ca₂Cu₃O₁₀superconductors

The cause of ‘weak-link’ grain boundary behaviour in polycrystalline Bi₂Sr₂CaCu₂O₈and Bi₂Sr₂Ca₂Cu₃O₁₀superconductors

Analysis Method of High-Field Pinning Centers in NbTi Wires and MgB2 Wires

High-field transport properties of a P-doped BaFe2As2 film on technical substrate

Contact Info

Product

Resources

About

Effects of carbon concentration and filament number on advanced internal Mg infiltration-processed MgB2strands

Cited by 58 publications

References 34 publications

The cause of ‘weak-link’ grain boundary behaviour in polycrystalline Bi2Sr2CaCu2O8and Bi2Sr2Ca2Cu3O10superconductors

The cause of ‘weak-link’ grain boundary behaviour in polycrystalline Bi2Sr2CaCu2O8and Bi2Sr2Ca2Cu3O10superconductors

Analysis Method of High-Field Pinning Centers in NbTi Wires and MgB2 Wires

High-field transport properties of a P-doped BaFe2As2 film on technical substrate

Contact Info

Product

Resources

About

Effects of carbon concentration and filament number on advanced internal Mg infiltration-processed MgB₂strands

The cause of ‘weak-link’ grain boundary behaviour in polycrystalline Bi₂Sr₂CaCu₂O₈and Bi₂Sr₂Ca₂Cu₃O₁₀superconductors

The cause of ‘weak-link’ grain boundary behaviour in polycrystalline Bi₂Sr₂CaCu₂O₈and Bi₂Sr₂Ca₂Cu₃O₁₀superconductors