TY - JOUR
T1 - Enhanced critical current density in K-doped Ba122 polycrystalline bulk superconductors via fast densification
AU - Tokuta, Shinnosuke
AU - Hasegawa, Yuta
AU - Shimada, Yusuke
AU - Yamamoto, Akiyasu
N1 - Funding Information:
The authors would like to thank Dr. Soshi Iimura and Dr. Kota Hanzawa (Tokyo Institute of Technology) for their help with the high-field measurements and Dr. Tsunehiro Takeuchi (Toyota Technological Institute) for helpful advice about SPS. This work was supported by JST CREST ( JPMJCR18J4 ), JSPS KAKENHI ( JP21H01615 ), and Nanotechnology Platform ( A-18-TU-0037 ) of the MEXT , Japan. AY was supported by MEXT Elements Strategy Initiative to Form Core Research Center (Grant No. JPMXP0112101001 ).
Funding Information:
The authors would like to thank Dr. Soshi Iimura and Dr. Kota Hanzawa (Tokyo Institute of Technology) for their help with the high-field measurements and Dr. Tsunehiro Takeuchi (Toyota Technological Institute) for helpful advice about SPS. This work was supported by JST CREST (JPMJCR18J4), JSPS KAKENHI (JP21H01615), and Nanotechnology Platform (A-18-TU-0037) of the MEXT, Japan. AY was supported by MEXT Elements Strategy Initiative to Form Core Research Center (Grant No. JPMXP0112101001). Conceptualization, S.T. and A.Y.; Methodology, S.T.; Investigation, S.T and Y.S; Writing ? Original Draft, S.T.; Writing ?Review & Editing, S.T. Y.H. Y.S. and A.Y.; Supervision, A.Y. The authors declare no competing interests.
Publisher Copyright:
© 2022 The Authors
PY - 2022/4/15
Y1 - 2022/4/15
N2 - Iron-based superconductors are expected to be used in strong magnet applications owing to their excellent superconducting properties. The process of sintering a mechanically alloyed precursor powder is effective in achieving a high upper critical field and critical current density in BaFe2As2 (Ba122) polycrystalline bulk materials. However, when this process is applied to K-doped Ba122, which shows the highest critical temperature in the Ba122 family, suppressing the vaporization of potassium is challenging. In this study, spark plasma sintering (SPS) method was applied to K-doped Ba122 to achieve fast densification. In contrast to the conventional synthesis method, which requires several tens of hours, optimally K-doped bulks with near theoretical density were obtained after only 5 min of SPS, and the magnetic critical current density reached 105 A/cm2 at 5 K. The demonstrated superconducting properties suggest that this fast densification technique is a useful tool for applying K-doped Ba122 to bulk trapped field magnets.
AB - Iron-based superconductors are expected to be used in strong magnet applications owing to their excellent superconducting properties. The process of sintering a mechanically alloyed precursor powder is effective in achieving a high upper critical field and critical current density in BaFe2As2 (Ba122) polycrystalline bulk materials. However, when this process is applied to K-doped Ba122, which shows the highest critical temperature in the Ba122 family, suppressing the vaporization of potassium is challenging. In this study, spark plasma sintering (SPS) method was applied to K-doped Ba122 to achieve fast densification. In contrast to the conventional synthesis method, which requires several tens of hours, optimally K-doped bulks with near theoretical density were obtained after only 5 min of SPS, and the magnetic critical current density reached 105 A/cm2 at 5 K. The demonstrated superconducting properties suggest that this fast densification technique is a useful tool for applying K-doped Ba122 to bulk trapped field magnets.
KW - Condensed matter physics
KW - Superconductivity
KW - Transport property of condensed matter
UR - http://www.scopus.com/inward/record.url?scp=85126335542&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85126335542&partnerID=8YFLogxK
U2 - 10.1016/j.isci.2022.103992
DO - 10.1016/j.isci.2022.103992
M3 - Article
AN - SCOPUS:85126335542
SN - 2589-0042
VL - 25
JO - iScience
JF - iScience
IS - 4
M1 - 103992
ER -