Enhanced critical current density in bulk MgB2

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

Enhanced critical current density in bulk MgB2

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Enhanced critical current density in bulk MgB2

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

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

Projekt

<a href="/cs/project/GB14-36566G" target="_blank" >GB14-36566G: Multidisciplinární výzkumné centrum moderních materiálů</a><br>

Návaznosti

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

Rok uplatnění

2018

Kód důvěrnosti údajů

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

Název periodika

IEEE Transactions on Applied Superconductivity

ISSN

1051-8223

e-ISSN

—

Svazek periodika

28

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

5

Strana od-do

—

Kód UT WoS článku

000426633000001

EID výsledku v databázi Scopus

2-s2.0-85041229870