Preparation and Characterization of Mg1-xB2 Bulk Samples and Cu/Nb Sheathed Wires with Low Grade Amorphous Boron Powder

Jean-Claude Grivel, Aikaterini Alexiou, Katerina Rubesova, Xiao Tang, Niels Hessel Andersen, M. von Zimmermann, A. Watenphul

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

MgB2 bulk and wire samples were prepared using cheap, low grade amorphous boron powders. Based on chemical analysis performed on the starting reagents, three nominal stoichiometries were studied. It was found that the structural and superconducting properties of the bulk samples were not affected by the composition, but that residual Mg was left in the wires for the nominal MgB2 composition. In contrast, slightly Mg-deficient compositions were free from residual Mg and exhibited higher critical current densities. The MgB2 phase formation kinetics was not influenced by the variations in the nominal powder composition.
Original languageEnglish
JournalJournal of Superconductivity and Novel Magnetism
Volume27
Issue number2
Pages (from-to)497-504
Number of pages8
ISSN1557-1939
DOIs
Publication statusPublished - 2014

Keywords

  • PHYSICS,
  • CRITICAL-CURRENT DENSITY
  • SUPERCONDUCTING PROPERTIES
  • STARTING COMPOSITION
  • PRECURSOR POWDER
  • MGB2 WIRES
  • FIELD
  • STOICHIOMETRY
  • MAGNETIZATION
  • TAPES
  • PHASE
  • MgB2
  • Stoichiometry
  • Wires
  • Synchrotron
  • Critical current
  • Boron
  • Critical currents
  • Synchrotrons
  • Amorphous boron powder
  • Bulk samples
  • Low grade
  • Phase formations
  • Powder composition
  • Structural and superconducting properties
  • Wire
  • BORON
  • HASH(0x39fce50)

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