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High trapped fields in bulk MgB2 prepared by hot-pressing of ball-milled precursor powder

Bulk superconducting MgB2 samples, 20 mm in diameter, were prepared by hot-pressing of ball-milled Mg and B powders using fine-grained boron powders. High maximum trapped fields of B0 = 5.4 T were obtained at 12 K in one of the investigated trapped field magnets (height 8 mm) at the centre of the bu... Full description

Contained in: Superconductor Science and Technology Vol. 26, No. 12 (2013), p. 122002/1-5
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Links: Additional Link (dx.doi.org)
ISSN: 1361-6668
Additional Keywords: BOR
KRITISCHER-STROM
TEMPERATUREINFLUSS
DOI: 10.1088/0953-2048/26/12/122002
Notes: Copyright: Metadaten: TEMA, Copyright WTI-Frankfurt eG
Copyright: (C) Alle Rechte beim Herausgeber
Physical Description: 5 Seiten, 14 Quellen
ID (e.g. DOI, URN): 10.1088/0953-2048/26/12/122002
PPN (Catalogue-ID): WTI053149920
Note: WTI TEMA DB
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520 |a Bulk superconducting MgB2 samples, 20 mm in diameter, were prepared by hot-pressing of ball-milled Mg and B powders using fine-grained boron powders. High maximum trapped fields of B0 = 5.4 T were obtained at 12 K in one of the investigated trapped field magnets (height 8 mm) at the centre of the bulk surface. Investigating the temperature dependence of the trapped field for short MgB2 samples (height ≤1.6 mm), trapped fields of up to B0 = 3.2 T at 15 K were achieved. These high trapped fields are related to extremely high critical current densities of up to 106 A cm−2 at 15 K, indicating strong pinning due to nanocrystalline MgB2 grains. Expected trapped field data for long trapped field magnets prepared from the available MgB2 material are estimated. [Copyright IOP Institute of Physics Publishing. Reproduced with permission.] 
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