Strong enhancement of critical current density in MgB2 bulk and Ni-sheathed tapes with very small DY2O3 additions (Articolo in rivista)

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Label
  • Strong enhancement of critical current density in MgB2 bulk and Ni-sheathed tapes with very small DY2O3 additions (Articolo in rivista) (literal)
Anno
  • 2007-01-01T00:00:00+01:00 (literal)
Alternative label
  • Chen, SK; Wei, M; Grasso, G; Malagoli, A; Braccini, V; MacManus-Driscoll, JL (2007)
    Strong enhancement of critical current density in MgB2 bulk and Ni-sheathed tapes with very small DY2O3 additions
    in IEEE transactions on applied superconductivity (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Chen, SK; Wei, M; Grasso, G; Malagoli, A; Braccini, V; MacManus-Driscoll, JL (literal)
Pagina inizio
  • 2786 (literal)
Pagina fine
  • 2789 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 17 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Univ Cambridge, Dept Met & Mat Sci, Cambridge CB2 1TN, England; Columbus Supercond SpA, I-16152 Genoa, Italy; CNR, INFM LAMIA, I-16152 Genoa, Italy (literal)
Titolo
  • Strong enhancement of critical current density in MgB2 bulk and Ni-sheathed tapes with very small DY2O3 additions (literal)
Abstract
  • A series of polycrystalline samples were prepared by in situ reaction of Dy2O3 (0.5-5.0 wt.%) with Mg + B. While the superconducting transition temperature, T-c remained largely unchanged, the intragrain distribution of nano precipitates of DyB4 and MgO led to strong enhancement in critical current density, J(c) at lower field below 4 T. The best sample (with only 0.5 wt.% Dy2O3 additions) had a J(c) (1 T) of around a factor of 4 higher compared to the pure sample at 6 K and 20 K indicating improved connectivity and pinning. On the other hand, ex situ Ni-sheathed tapes fabricated from the Dy2O3 added powders exhibited critical current, I-c (4.2 K) superior to those made from pure MgB2 powders at higher field above 3 T. The former also showed lower anisotropy in I-c with respect to field direction. (literal)
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