Enhanced superconducting properties of pre-doped B powder type MgB2 strands

Details Enhanced superconducting properties of pre-doped B powder type MgB2 strands Enhanced superconducting properties of pre-doped B powder type MgB2 strands

2010-08-18

arxiv.org/abs/1008.3174v1

Physics

Condensed Matter

Superconductivity

12 pages, 3 figures submitted to Applied Physics Letters

Scientific paper

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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