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Progress in MgB2 Superconductor Wires and Tapes
김정호,Hiroaki Kumakura,Matthew Rindflesich,Shi Xue Dou,황수민,주진호 한국초전도학회 2011 Progress in superconductivity Vol.12 No.2
We report on the progress that has been made in developing MgB2 superconducting wires and tapes for commercialization and research efforts. A number of techniques have been developed to overcome the obstacle posed by the poor critical current density (Jc) of pristine MgB2. Chemical doping has proved to be the effective way to modify and enhance the superconducting properties, such as the Jc and the irreversibility field (Birr). More than 100 different types of dopants have been investigated over the past 8 years. Among these, the most effective dopants have been identified to be SiC and malic acid (C4H6O5). The best results, viz. a Birr of 22 T and Jc of 30,000 A·cm-2 at 4.2 K and 10 T, were reported for malic acid doped MgB2 wires, which matched the benchmark performance of commercial low temperature superconductor wires. In this work, we discuss the progress made in MgB2 conductors over the past few years at the University of Wollongong, Hyper Tech Research, Inc., and Ohio State University.
Progress in $MgB_2$ Superconductor Wires and Tapes
Kim, Jung-Ho,Kumakura, Hiroaki,Rindflesich, Matthew,Dou, Shi Xue,Hwang, Soo-Min,Joo, Jin-Ho The Korean Superconductivity Society 2011 Progress in superconductivity Vol.12 No.2
We report on the progress that has been made in developing $MgB_2$ superconducting wires and tapes for commercialization and research efforts. A number of techniques have been developed to overcome the obstacle posed by the poor critical current density ($J_c$) of pristine $MgB_2$. Chemical doping has proved to be the effective way to modify and enhance the superconducting properties, such as the $J_c$ and the irreversibility field ($B_{irr}$). More than 100 different types of dopants have been investigated over the past 8 years. Among these, the most effective dopants have been identified to be SiC and malic acid ($C_4H_6O_5$). The best results, viz. a $B_{irr}$ of 22 T and $J_c$ of $30,000\;A{\cdot}cm^{-2}$ at 4.2 K and 10 T, were reported for malic acid doped $MgB_2$ wires, which matched the benchmark performance of commercial low temperature superconductor wires. In this work, we discuss the progress made in $MgB_2$ conductors over the past few years at the University of Wollongong, Hyper Tech Research, Inc., and Ohio State University.
Tailored Materials for High‐Performance MgB<sub>2</sub> Wire
Kim, Jung Ho,Oh, Sangjun,Kumakura, Hiroaki,Matsumoto, Akiyoshi,Heo, Yoon‐,Uk,Song, Kyeong‐,Se,Kang, Yong‐,Mook,Maeda, Minoru,Rindfleisch, Matt,Tomsic, Mike,Choi, Seyong,Dou, Shi Xue WILEY‐VCH Verlag 2011 Advanced Materials Vol.23 No.42
<P><B>Carbon‐encapsulated crystalline boron nanopowder</B> and coarse magnesium powder are used as inexpensive tailored starting materials for the fabrication of high‐performance MgB<SUB>2</SUB> superconducting wire. A low sintering temperature leads to a high critical current density, as a result of nanometer‐sized boron powder, surface oxidation preclusion by carbon encapsulation, and grain alignment by elongated magnesium coarse powder.</P>
Microscopic role of carbon on MgB2 wire for critical current density comparable to NbTi
Kim, Jung Ho,Oh, Sangjun,Heo, Yoon-Uk,Hata, Satoshi,Kumakura, Hiroaki,Matsumoto, Akiyoshi,Mitsuhara, Masatoshi,Choi, Seyong,Shimada, Yusuke,Maeda, Minoru,MacManus-Driscoll, Judith L,Dou, Shi Xue Nature Publishing Group 2012 NPG Asia Materials Vol.4 No.-