TY - JOUR
T1 - Microstructure and superconducting properties of Cu addition MgB2 multifilamentary wires using boron isotope powder as the boron source material
AU - Hishinuma, Y.
AU - Kikuchi, A.
AU - Matsuda, K.
AU - Nishimura, K.
AU - Kubota, Y.
AU - Hata, S.
AU - Yamada, S.
AU - Takeuchi, T.
N1 - Funding Information:
This work was mainly supported by the NIFS program budget (NIFS11UFFF036), in part by the Grant-in-Aid for Young Scientists (B#21760240) from the Ministry of Education, Culture, Sports, Science and Technology (MEXT). We would like to thank for Tsukuba Magnet Laboratory of National Institute for Materials Science for providing with the chance to use high magnetic field magnet facilities for the Ic measurement. And also thanks for the Instrument Center of Institute for Molecular Science for proving with the use SQUID magnetometers for Tc measurements.
Publisher Copyright:
© 2012 Published by Elsevier B.V. Selection and/or peer-review under responsibility of the Guest Editors.
PY - 2012
Y1 - 2012
N2 - The natural boron has two kinds of isotopes which are existed 20 wt% boron-10 (10B) and 80 wt% boron-11 (11B). 11B isotope is stable against the neutron irradiation without nuclear transformation. For an advanced fusion application, in-situ PIT process using 11B isotope powder as the boron source material was desirable to enhance low induced radio-activity of MgB2superconducting wire. We tried to fabricate the in-situ Cu addition MgB2/Ta/Cu multifilamenatry wire using boron isotope powder as the boron source material. In this study, superconductivity and microstructure of MgB2 wire using boron isotope powder were investigated. Tc value of MgB2 wire using 11B powder was shown to about 37 K by the low temperature diffusion reaction, and its value was higher than commercial natural powder. However, Jc value of MgB2 wire using 11B isotope powder was remarkably lower than that of commercial natural powder. This is caused by the forming of much impurity phase and decrease of MgB2 volume fraction due to the remaining of much non-reactive 11B isotope powder.
AB - The natural boron has two kinds of isotopes which are existed 20 wt% boron-10 (10B) and 80 wt% boron-11 (11B). 11B isotope is stable against the neutron irradiation without nuclear transformation. For an advanced fusion application, in-situ PIT process using 11B isotope powder as the boron source material was desirable to enhance low induced radio-activity of MgB2superconducting wire. We tried to fabricate the in-situ Cu addition MgB2/Ta/Cu multifilamenatry wire using boron isotope powder as the boron source material. In this study, superconductivity and microstructure of MgB2 wire using boron isotope powder were investigated. Tc value of MgB2 wire using 11B powder was shown to about 37 K by the low temperature diffusion reaction, and its value was higher than commercial natural powder. However, Jc value of MgB2 wire using 11B isotope powder was remarkably lower than that of commercial natural powder. This is caused by the forming of much impurity phase and decrease of MgB2 volume fraction due to the remaining of much non-reactive 11B isotope powder.
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U2 - 10.1016/j.phpro.2012.06.119
DO - 10.1016/j.phpro.2012.06.119
M3 - Conference article
AN - SCOPUS:84902292589
SN - 1875-3892
VL - 36
SP - 1486
EP - 1491
JO - Physics Procedia
JF - Physics Procedia
T2 - Superconductivity Centennial Conference, SCC 2011
Y2 - 18 September 2011 through 23 September 2011
ER -