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Enhancing critical current density of bulk MgB.sub.2./sub. via nanoscale boron and Dy.sub.2./sub.O.sub.3./sub. doping
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SYSNO ASEP 0565188 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Enhancing critical current density of bulk MgB2 via nanoscale boron and Dy2O3 doping Author(s) Miryala, M. (JP)
Kitamoto, K. (JP)
Arvapalli, S.S. (JP)
Das, D. (IN)
Jirsa, Miloš (FZU-D) RID, ORCID
Murakami, M. (JP)
Mamidanna, S.R.R. (IN)Number of authors 7 Article number 2200487 Source Title Advanced Engineering Materials. - : Wiley - ISSN 1438-1656
Roč. 24, č. 11 (2022)Number of pages 7 s. Language eng - English Country DE - Germany Keywords critical current density (J(c)) ; Dy2O3 doping ; flux pinning ; MgB2 ; nanoscale boron ; Raman spectroscopy Subject RIV BM - Solid Matter Physics ; Magnetism OECD category Condensed matter physics (including formerly solid state physics, supercond.) Method of publishing Open access Institutional support FZU-D - RVO:68378271 UT WOS 000829204400001 EID SCOPUS 85134625678 DOI 10.1002/adem.202200487 Annotation Moderate critical current density (Jc) has been a long-lasting problem in bulkMgB2superconductors. We show a certain increment inJcof bulk MgB2via theuse of amorphous boron precursor together with Dy2O3doping. Dy2O3dopantconcentration varies from 0 to 2 wt%. X-Ray diffraction (XRD) shows the for-mation of DyB4particles. The critical temperature (Tc) is not affected by Dy2O3doping and stands close to 38 K, showing that there is no Dy interaction with theMgB2lattice. Microstructural studies show nanometer-sized MgB2grains. A highself-fieldJcof around 380 kA cm 2is achieved at 20 K within the Dy2O3dopingrange of 0.5–1.5 wt%. At around 1 wt% Dy2O3doping an improved high-fieldperformance, 90 kA cm 2at 2 T, 20 K, is observed. In theflux pinning diagram,1 wt% Dy2O3doping caused a peak shift from 0.19 (0 wt%) to 0.23. This indicatessecondary pinning by DyB4and lattice strains. Raman studies show the increasein the phonon density of states (PDOS) with increasing Dy2O3doping. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2023 Electronic address https://hdl.handle.net/11104/0336703
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