O-free polyacrylonitrile doping to improve the J(c)(B) and H-c2 of MgB2 wires
- Authors
- Hwang, SM[Hwang, S. M.]; Sung, K[Sung, K.]; Choi, JH[Choi, J. H.]; Kim, W[Kim, W.]; Joo, J[Joo, J.]; Lim, JH[Lim, J. H.]; Kim, CJ[Kim, C. -J.]; Park, YS[Park, Y. S.]; Kim, DH[Kim, D. H.]
- Issue Date
- 1-Nov-2010
- Publisher
- ELSEVIER SCIENCE BV
- Keywords
- Critical current density; Doping; MgB2; Polyacrylonitrile; Upper critical field
- Citation
- PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, v.470, no.20, pp.1430 - 1434
- Indexed
- SCIE
SCOPUS
- Journal Title
- PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
- Volume
- 470
- Number
- 20
- Start Page
- 1430
- End Page
- 1434
- URI
- https://scholarworks.bwise.kr/skku/handle/2021.sw.skku/72889
- DOI
- 10.1016/j.physc.2010.05.130
- ISSN
- 0921-4534
- 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.
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Collections - Engineering > School of Advanced Materials Science and Engineering > 1. Journal Articles
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