Enhanced superconducting properties of pre-doped B powder type MgB2 strands
Susner, M. A. · Yang, Y. · Sumption, M. D. · Rindfleisch, M. A. · Tomsic, M. J. · Marzik, J. V. · Collings, E. W.
Original · EN
Conventional doping methods that directly add C or a C-bearing species to Mg+B powder have the disadvantage of adding C inhomogeneously, yielding either under-reacted regions or blocking phases. Pre-doped B powder provides a more homogeneous distribution of the C dopant in MgB2. Powders containing varying amounts of C were used to produce in-situ MgB2 strands which showed high values of transport Jc (104 A/cm2 at 13.3T). Compared to SiC-added and malic acid-treated strands the pre-doped MgB2 showed both higher values of Birr and transport Jc, indicating that the pre-doping of B leads to more efficient C substitution into the B-sublattice.
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