O-free polyacrylonitrile doping to improve the J(c)(B) and H-c2 of MgB2 wires

Title
O-free polyacrylonitrile doping to improve the J(c)(B) and H-c2 of MgB2 wires
Author(s)
김동호박영순주진호[주진호]김찬중[김찬중]J.H.Lim[J.H.Lim]S.M.Hwang[S.M.Hwang]K.Sung[K.Sung]H.J.Choi[H.J.Choi]W.Kim[W.Kim]
Keywords
SUPERCONDUCTING PROPERTIES; CARBON; FE
Issue Date
201005
Publisher
ELSEVIER SCIENCE BV
Citation
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, v.470, no.20, pp.1430 - 1434
Abstract
We selected polyacrylonitrile (PAN, -[C3H3N]-) as an O-free organic dopant and fabricated C-doped MgB2 wires by in situ and powder-in-tube techniques. 0-5 wt.% PAN powders were uniformly mixed with B powder using a liquid mixing method. The precursor powders were mixed with Mg powder, filled into Fe tubes, and then drawn into wires. Sintering was performed at 900 degrees C for 1 h in a flowing Ar gas. The PAN doping decreased the critical temperature (T-c) and a-axis lattice parameter, but significantly improved the critical current density (J(c)) in high fields, upper critical field (H-c2), and irreversibility field (H-irr) performances. These results are attributed to the replacement of B sites with C by the PAN doping. Furthermore, as expected, the MgO amount did not increase as the doping content increased. The J(c), of the PAN-doped MgB2 wires was more than one order of magnitude higher than that of the undoped MgB2 wire at 5 K and 6.6 T (1.46-3.82 kA/cm(2) vs. 0.11 kA/cm(2)). (c) 2010 Elsevier B.V. All rights reserved.
URI
http://hdl.handle.net/YU.REPOSITORY/22471http://dx.doi.org/10.1016/j.physc.2010.05.130
ISSN
0921-4534
Appears in Collections:
이과대학 > 물리학과 > Articles
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