Improvement of the critical current density and upper critical field in C-doped MgB2 wire using cellulose acetate

Title
Improvement of the critical current density and upper critical field in C-doped MgB2 wire using cellulose acetate
Author(s)
김동호주진호[주진호]박영순황수민[황수민]이창민[이창민]김원[김원]박근철[박근철]임준형[임준형]강원남[강원남]
Keywords
FLUX-PINNING PROPERTIES; SUPERCONDUCTORS
Issue Date
201012
Publisher
KOREAN INST METALS MATERIALS
Citation
METALS AND MATERIALS INTERNATIONAL, v.16, no.6, pp.1029 - 1033
Abstract
We fabricated carbon-doped MgB2 wires by an in-situ reaction route using cellulose acetate (CA) as an organic dopant in order to investigate the correlation between the critical properties and the CA doping level based on the phase formation and lattice changes. The starting B powder was uniformly mixed with 0 wt.% to 7 wt.% CA powders by a liquid mixing technique. The precursor powders were mixed with Mg powder and loaded into Fe tubes, which were drawn into wires and then sintered at 900 A degrees C for 1 h under an Ar atmosphere. The CA doping reduced the critical temperature (T-c), but improved the critical current density (J(c)) in the magnetic field, upper critical field (H-c2), and irreversibility field (H-irr). These effects were attributed to the CA doping-induced substitution of C for the B sites, which consequently increased the flux pinning force and the charge-carrier scattering. The J(c) value of the MgB2 wire doped with 7 wt.% CA was improved by a factor of 31 (3.46 kA/cm(2)) as compared with that of the pure wire (0.11 kA/cm(2)) at 5 K and 6.6 T. This increase suggests that the CA doping via the liquid mixing is an effective way to improve the J(c)(B) and H-c2 of MgB2 wire.
URI
http://hdl.handle.net/YU.REPOSITORY/23290http://dx.doi.org/10.1007/s12540-010-1225-y
ISSN
1598-9623
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이과대학 > 물리학과 > Articles
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