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Record critical current density in bulk MgB.sub.2./sub. using carbon-coated amorphous boron with optimum sintering conditions
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SYSNO ASEP 0477669 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Record critical current density in bulk MgB2 using carbon-coated amorphous boron with optimum sintering conditions Author(s) Muralidhar, M. (JP)
Higuchi, M. (JP)
Diko, P. (SK)
Jirsa, Miloš (FZU-D) RID, ORCID
Murakami, M. (JP)Number of authors 5 Article number 012056 Source Title Journal of Physics: Conference Series, 871. - Bristol : IOP Publishing, 2017 - ISSN 1742-6588 Pages s. 1-6 Number of pages 6 s. Publication form Print - P Action International Symposium on Superconductivity /29./, ISS 2016 Event date 13.12.2016 - 15.12.2016 VEvent location Tokyo Country JP - Japan Event type WRD Language eng - English Country GB - United Kingdom Keywords MgB2 ; bulk superconductors ; microstructure ; critical currents ; carbon coated boron Subject RIV BM - Solid Matter Physics ; Magnetism OECD category Condensed matter physics (including formerly solid state physics, supercond.) Institutional support FZU-D - RVO:68378271 EID SCOPUS 85027982597 DOI 10.1088/1742-6596/871/1/012056 Annotation We report on the synthesis and characterization of a sintered bulk MgB2 material produced at an optimized sintering temperature with a varying content of carbon-encapsulated amorphous boron. A series of MgB2 bulks was prepared with 0%, 1.5%, 2.8%, 7.3%, 12% and 16.5% of carbon-encapsulated boron. In the samples with 12% of carbon-encapsulated boron, Mg and MgB2C2 formation was observed. Tc was around 38.4 K for the pure MgB2 and decreased with increasing carbon content up to 25 K for 16.5 % of carbon-encapsulated boron. The highest Jc values of 470 kA/cm2 and 310 kA/cm2, in the self-field and 1 T, respectively, were achieved at 20 K, in the MgB2 sample with 1.5% of carbon-encapsulated boron. It proved that the optimized sintering conditions together with the appropriate amount of the carbon-coated boron were able to bring critical current performance of bulk MgB2 material up to the level necessary for real technical applications.
Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2018
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