TY - JOUR
T1 - Effects of Carbon Doping on Trapped Magnetic Field of MgB2 Bulk Prepared by in-situ Hot Isostatic Pressing Method
AU - Naito, Tomoyuki
AU - Ogino, Arata
AU - Fujishiro, Hiroyuki
AU - Awaji, Satoshi
N1 - Funding Information:
Manuscript received September 25, 2019; accepted March 30, 2020. Date of publication April 6, 2020; date of current version May 18, 2020. This work was supported by JSPS KAKENHI under Grants JP15K04718, JP15K04646, JP18K04920. (Corresponding author: Tomoyuki Naito.) Tomoyuki Naito, Arata Ogino, and Hiroyuki Fujishiro are with the Faculty of Science and Engineering, Iwate University, Morioka 020-8551, Japan (e-mail: tnaito@iwate-u.ac.jp; cloud3254@gmail.com; fujishiro@iwate-u.ac.jp).
Publisher Copyright:
© 2002-2011 IEEE.
PY - 2020/6/1
Y1 - 2020/6/1
N2 - We report the effects of carbon doping on the trapped field properties of MgB2 bulks doped with graphite (C) and B4C, which were prepared by an in-situ hot isostatic pressing method. The trapped fields, BT's were degraded by the graphite and B4C doping above 15 K, which was predominantly due to the lowered Tc by the C substitution. However, the slope of BT(T) and the irreversibility line, Birr(T), determined from the resistive transitions indicated that the BT of the graphite-doped bulk was expected to exceed that of the pristine bulk below 15 K. Contrary to the literature by other groups, B4C did not enhance the vortex pinning properties.
AB - We report the effects of carbon doping on the trapped field properties of MgB2 bulks doped with graphite (C) and B4C, which were prepared by an in-situ hot isostatic pressing method. The trapped fields, BT's were degraded by the graphite and B4C doping above 15 K, which was predominantly due to the lowered Tc by the C substitution. However, the slope of BT(T) and the irreversibility line, Birr(T), determined from the resistive transitions indicated that the BT of the graphite-doped bulk was expected to exceed that of the pristine bulk below 15 K. Contrary to the literature by other groups, B4C did not enhance the vortex pinning properties.
KW - carbon doping
KW - MgB
KW - trapped field
UR - http://www.scopus.com/inward/record.url?scp=85085251955&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85085251955&partnerID=8YFLogxK
U2 - 10.1109/TASC.2020.2985355
DO - 10.1109/TASC.2020.2985355
M3 - Article
AN - SCOPUS:85085251955
SN - 1051-8223
VL - 30
JO - IEEE Transactions on Applied Superconductivity
JF - IEEE Transactions on Applied Superconductivity
IS - 4
M1 - 9057401
ER -