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

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, in some cases, secondary phases which may be either beneficial or detrimental. Alternatively, pre-doped B powder provid...

Full description

Saved in:
Bibliographic Details
Published in:Superconductor science & technology 2011-01, Vol.24 (1), p.012001-012001
Main Authors: Susner, M A, Yang, Y, Sumption, M D, Collings, E W, Rindfleisch, M A, Tomsic, M J, Marzik, J V
Format: Article
Language:English
Subjects:
Borides
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Critical currents
Dopants
Exact sciences and technology
Magnesium compounds
Phases
Physics
Properties of type I and type II superconductors
Strands
Superconductivity
Superconductors
Transport
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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, in some cases, secondary phases which may be either beneficial or detrimental. Alternatively, pre-doped B powder provides a more homogeneous distribution of the C dopant in MgB2. In this work, powders containing varying amounts of C were used to produce in situ MgB2 strands which showed high values of Bc2, Birr and transport Jc (104 A cm - 2 at 13.3 T). Compared to SiC-added and malic-acid-treated strands the pre-doped MgB2 showed high values of Birr primarily due to more efficient C substitution into the B sublattice and a concomitant increase in transport Jc.
ISSN:0953-2048
1361-6668
DOI:10.1088/0953-2048/24/1/012001