TY - JOUR
T1 - Current transport mechanism and control of the ν-value for ag/bi2212 wires and tapes
AU - Awaji, Satoshi
AU - Inoue, Takushi
AU - Takahashi, Ken Ichiro
AU - Badica, Petre
AU - Nishijima, Gen
AU - Watanabe, Kazuo
PY - 2009/6
Y1 - 2009/6
N2 - In order to study the mechanism of the small n-value for Bi2212, E - J characteristics were measured carefully for various kinds of Bi2212 tapes and round wires in high magnetic fields. Some of wires were heat-treated in a magnetic field of 5 T. We found that the ν-values of all the samples increase by the in-field heat-treatment at 5 T. In addition, we analyzed the E - J properties by the combination of the percolation model based on the local J c distribution and the two directional Jc distribution model. The improvement of the ν-value by the in-field heat treatment can be understood by the change of the aspect-ratio of the grains. Therefore, the aspect-ratio of the grains plays an important role in the current transport influencing not only Jc but also ν-value
AB - In order to study the mechanism of the small n-value for Bi2212, E - J characteristics were measured carefully for various kinds of Bi2212 tapes and round wires in high magnetic fields. Some of wires were heat-treated in a magnetic field of 5 T. We found that the ν-values of all the samples increase by the in-field heat-treatment at 5 T. In addition, we analyzed the E - J properties by the combination of the percolation model based on the local J c distribution and the two directional Jc distribution model. The improvement of the ν-value by the in-field heat treatment can be understood by the change of the aspect-ratio of the grains. Therefore, the aspect-ratio of the grains plays an important role in the current transport influencing not only Jc but also ν-value
KW - Ampersandnucolon-value
KW - Bi2212 tape and wires
KW - Critical current density
KW - High magnetic field
KW - In-field heat-treatment
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U2 - 10.1109/TASC.2009.2018211
DO - 10.1109/TASC.2009.2018211
M3 - Article
AN - SCOPUS:68649100396
VL - 19
SP - 3071
EP - 3075
JO - IEEE Transactions on Applied Superconductivity
JF - IEEE Transactions on Applied Superconductivity
SN - 1051-8223
IS - 3
M1 - 5153165
ER -