TY - JOUR
T1 - Significant improvement in critical current densities of C-doped MgB 2 tapes made by high-energy ball milling
AU - Wang, Chengduo
AU - Ma, Yanwei
AU - Zhang, Xianping
AU - Gao, Zhaoshun
AU - Wang, Dongliang
AU - Yao, Chao
AU - Wang, Chunlei
AU - Oguro, Hidetoshi
AU - Awaji, Satoshi
AU - Watanabe, Kazuo
N1 - Copyright:
Copyright 2012 Elsevier B.V., All rights reserved.
PY - 2012/7
Y1 - 2012/7
N2 - C-doped MgB 2 tapes were fabricated using crystalline boron as one of the ball milled precursor powders. It was found that the ball milling process can strongly enhance the J c values of MgB 2 tapes and reduce the anisotropy of the J c. At 4.2K, the transport J c of the 80h milled C-doped MgB 2 tapes sintered at 800°C reaches 4.3×10 4Acm 2 at 10T and 2.2×10 4Acm 2 at 12T, respectively. These values are even higher than for tapes made from amorphous B powders. Ball milling can improve not only the upper critical field, by increasing the C substitution level in the MgB 2 lattice, but also the flux pinning, by increasing grain boundaries, both of which result in the enhancement of J c performance. Moreover, the high MgB 2 phase fraction and large density of milled MgB 2 tapes are beneficial to the active area. These results indicate that the use of crystalline B in combination with a ball milling process may be an economic method to harness the excellent properties of MgB 2 for practical applications.
AB - C-doped MgB 2 tapes were fabricated using crystalline boron as one of the ball milled precursor powders. It was found that the ball milling process can strongly enhance the J c values of MgB 2 tapes and reduce the anisotropy of the J c. At 4.2K, the transport J c of the 80h milled C-doped MgB 2 tapes sintered at 800°C reaches 4.3×10 4Acm 2 at 10T and 2.2×10 4Acm 2 at 12T, respectively. These values are even higher than for tapes made from amorphous B powders. Ball milling can improve not only the upper critical field, by increasing the C substitution level in the MgB 2 lattice, but also the flux pinning, by increasing grain boundaries, both of which result in the enhancement of J c performance. Moreover, the high MgB 2 phase fraction and large density of milled MgB 2 tapes are beneficial to the active area. These results indicate that the use of crystalline B in combination with a ball milling process may be an economic method to harness the excellent properties of MgB 2 for practical applications.
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U2 - 10.1088/0953-2048/25/7/075010
DO - 10.1088/0953-2048/25/7/075010
M3 - Article
AN - SCOPUS:84862742021
VL - 25
JO - Superconductor Science and Technology
JF - Superconductor Science and Technology
SN - 0953-2048
IS - 7
M1 - 075010
ER -