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This article was originally published as Kim, JH, Yeoh, WK, Xu, X, Xhi, DQ and Dou, SX, Improvement of Upper Critical Field and Critical Current Density in Single Walled CNT Doped MgB2=Fe Wires, IEEE Transactions on Applied Superconductivity, 17(2), 2007, 2907-2910. Copyright: 2007, IEEE.


We evaluated the doping effect of single walled carbon nanotubes (SWCNT) on the phase formation, microstructure, critical current density ( ), and upper critical field ( 2) of MgB2 superconductor. All samples were sintered at temperatures ranging from 650 to 1000 C for 30 min. A typical high sintering temperature (900 C) sample was composed of well-consolidated MgB2 grain of 100 to 200 nm and nanosized particles, resulting in enhancement of and 2. This indicates that lattice defects and microstructural change have occurred as a result of carbon (C) coming from SWCNT. On the other hand, a sample sintered at low temperature (700 C) contained relatively large grains. Specifically, SWCNT dopedMgB2 wire sintered at 900 C exhibited excellent 104 Acm 2 up to 8 T at 4.2 K. This result indicates that flux pinning for sample produced at a high sintering temperature are enhanced by SWCNT doping. SWCNT is one of the promising C sources for MgB2 superconductor with excellent .

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