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Improved superconducting performance of Ag-added nano-diamond doped MgB2
Author(s): J. Longji Dadiel; M. Muralidhar; M. Murakami
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Paper Abstract

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.

Paper Details

Date Published: 14 May 2019
PDF: 6 pages
Proc. SPIE 11054, Superconductivity and Particle Accelerators 2018, 110540I (14 May 2019); doi: 10.1117/12.2525216
Show Author Affiliations
J. Longji Dadiel, Shibaura Institute of Technology (Japan)
M. Muralidhar, Shibaura Institute of Technology (Japan)
M. Murakami, Shibaura Institute of Technology (Japan)


Published in SPIE Proceedings Vol. 11054:
Superconductivity and Particle Accelerators 2018
Dariusz Bocian; Ryszard S. Romaniuk, Editor(s)

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