TY - GEN
T1 - Improved superconducting performance of Ag-added nano-diamond doped MgB2
AU - Dadiel, J. Longji
AU - Muralidhar, M.
AU - Murakami, M.
N1 - Funding Information:
The paper was supported by Grant-in-Aid FD research budget code: 112261, Shibaura Institute of Technology (SIT) in collaboration with the JICA-ABE initiative budget.
Publisher Copyright:
© 2019 SPIE.
PY - 2019
Y1 - 2019
N2 - The performance improvement of disk- shaped bulk MgB2 superconductor by means of a nanoscopic diamond powder have been investigated in our previous studies, using a single-step solid-state reaction process. To further improve the critical current density (Jc), we added Ag with varied compositions of 3.5, 4.0, 4.5 wt.% in the optimized composition of 0.8 wt.% of nanodiamond added MgB2 sample and synthesized in pure Ar atmosphere. All samples were sintered at an optimized temperature of 775°C for 3 hours. X-ray diffraction patterns conformed to the main phases of MgB2 samples with additional phases observed in the Ag-added samples. Microstructures were observed with high magnification in field emission scanning electron microscope (FE-SEM) and indicated AgMg nanoparticles are embedded in the MgB2-nanodiamond matrix, which was correlated with XRD studies. Among, the 4.0 wt.% Ag doped sample exhibited the highest Jc of 389 kA/cm2 at 20 K. The present result showed that Ag addition to MgB2-nanodiamond is an effective pinning medium for bulk MgB2 and might thus be attractive for a further performance improvement of the bulk MgB2 material.
AB - The performance improvement of disk- shaped bulk MgB2 superconductor by means of a nanoscopic diamond powder have been investigated in our previous studies, using a single-step solid-state reaction process. To further improve the critical current density (Jc), we added Ag with varied compositions of 3.5, 4.0, 4.5 wt.% in the optimized composition of 0.8 wt.% of nanodiamond added MgB2 sample and synthesized in pure Ar atmosphere. All samples were sintered at an optimized temperature of 775°C for 3 hours. X-ray diffraction patterns conformed to the main phases of MgB2 samples with additional phases observed in the Ag-added samples. Microstructures were observed with high magnification in field emission scanning electron microscope (FE-SEM) and indicated AgMg nanoparticles are embedded in the MgB2-nanodiamond matrix, which was correlated with XRD studies. Among, the 4.0 wt.% Ag doped sample exhibited the highest Jc of 389 kA/cm2 at 20 K. The present result showed that Ag addition to MgB2-nanodiamond is an effective pinning medium for bulk MgB2 and might thus be attractive for a further performance improvement of the bulk MgB2 material.
KW - Critical current density
KW - MgB bulk
KW - Scanning electron microscopy
KW - X-ray diffraction
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U2 - 10.1117/12.2525216
DO - 10.1117/12.2525216
M3 - Conference contribution
AN - SCOPUS:85066024533
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Superconductivity and Particle Accelerators 2018
A2 - Romaniuk, Ryszard S.
A2 - Bocian, Dariusz
PB - SPIE
T2 - 4th Conference on Superconductivity and Particle Accelerators, SPAS 2018
Y2 - 27 November 2018 through 29 November 2018
ER -