Enhanced critical current density in bulk MgB2

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F18%3A00490135" target="_blank" >RIV/68378271:_____/18:00490135 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1109/TASC.2018.2793309" target="_blank" >http://dx.doi.org/10.1109/TASC.2018.2793309</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1109/TASC.2018.2793309" target="_blank" >10.1109/TASC.2018.2793309</a>

Result language

angličtina

Original language name

Enhanced critical current density in bulk MgB2

Original language description

The objectof this investigation is to improve the flux pinning and critical current density (J(c)) of bulk MgB2 materials for daily applications including superconducting permanent magnets. We prepared two sets of bulk MgB2 materials employing commercial high-purity powders of Mg metal and carbon-coated amorphous B using a single-step solid-state reaction process. The first set of samples was produced by a single-step solid-state reaction at various temperatures between 794 degrees C and 806 degrees C in steps of 3 degrees C in pure argon atmosphere to optimize the sintering temperature. Further, the second set of samples was produced from Mg-rich MgB2 material adding 1.5 wt% carbon-coated amorphous B powder to it, combined with 4 wt% of silver. X-ray diffraction analysis showed that samples were single-phase MgB2 with minor trace of impurities. In all samples, sharp superconducting transition temperatures were observed around 38 K, which was decreased around 1 K in MgB2 material produced with 1.5 wt% of carbon encapsulated boron. The critical current densities in Mg-rich MgB2 material with 4 wt% of Ag were lower than in silver-free MgB2 bulks. The sample with 1.5 wt% of carbon-coated B exhibited the highest Jc of 460 kA/cm(2) at 20 K and self-field. Our results demonstrate a strong correlation between the microstructure achieved and the resulting pinning performance.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Project

<a href="/en/project/GB14-36566G" target="_blank" >GB14-36566G: Multidisciplinary research centre for advanced materials</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

IEEE Transactions on Applied Superconductivity

ISSN

1051-8223

e-ISSN

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Volume of the periodical

28

Issue of the periodical within the volume

4

Country of publishing house

US - UNITED STATES

Number of pages

5

Pages from-to

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UT code for WoS article

000426633000001

EID of the result in the Scopus database

2-s2.0-85041229870