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Microstructure and critical current density in MgB.sub.2./sub. bulk made of 4.5 wt% carbon-coated boron
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SYSNO ASEP 0477618 Druh ASEP C - Konferenční příspěvek (mezinárodní konf.) Zařazení RIV D - Článek ve sborníku Název Microstructure and critical current density in MgB2 bulk made of 4.5 wt% carbon-coated boron Tvůrce(i) Higuchi, M. (JP)
Muralidhar, M. (JP)
Jirsa, Miloš (FZU-D) RID, ORCID
Murakami, M. (JP)Celkový počet autorů 4 Číslo článku 012059 Zdroj.dok. Journal of Physics: Conference Series, 871. - Bristol : IOP Publishing, 2017 - ISSN 1742-6588 Rozsah stran s. 1-5 Poč.str. 6 s. Forma vydání Tištěná - P Akce International Symposium on Superconductivity /29./, ISS 2016 Datum konání 13.12.2016 - 15.12.2016 Místo konání Tokyo Země JP - Japonsko Typ akce WRD Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova MgB2 ; bulk superconductors ; microstructure ; critical currents ; carbon coated boron Vědní obor RIV BM - Fyzika pevných látek a magnetismus Obor OECD Condensed matter physics (including formerly solid state physics, supercond.) Institucionální podpora FZU-D - RVO:68378271 EID SCOPUS 85027998380 DOI 10.1088/1742-6596/871/1/012059 Anotace Superconducting performance and its uniformity was studied in the single-step sintered MgB2 bulk prepared with 4.5 wt% of carbon in the carbon-encapsulated boron. The 20 mm in diameter MgB2 pellet was cut into several pieces from bottom to top and the microstructure, superconducting transition temperature (Tc onset), and critical current density at 20 K were studied. DC magnetization measurements showed a sharp superconducting transition with onset Tc at around 35.5 K in all positions. SEM analysis indicated a dispersion of grains between 200 and 300 nm in size, as the main pinning medium in this MgB2 superconductors. The critical current density at 20 K was quite uniform, around 330 kA/cm2 and 200 kA/cm2 at self-field and 1 T, respectively, for all measured positions. The results indicate that the carbonencapsulated boron is very promising for production of high quality bulk MgB2 material for various industrial applications. Pracoviště Fyzikální ústav Kontakt Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Rok sběru 2018
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