Mr. J. Longji Dadiel Profile

J. Longji Dadiel

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Proceedings Article | 14 May 2019 Paper

Improved superconducting performance of Ag-added nano-diamond doped MgB2

J. Longji Dadiel, M. Muralidhar, M. Murakami

Proceedings Volume 11054, 110540I (2019) https://doi.org/10.1117/12.2525216

KEYWORDS: Nanoparticles, Solid state physics, Nano silver particles, Superconductors, Magnetism, X-ray diffraction, Scanning electron microscopy

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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 (J_c), 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 J_c 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.

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