Processing and Characterization of Charcoal Added Bulk MgB2 Superconductor

J. Longji Dadiel, M. Muralidhar, Sai Srikanth Arvapalli, S. Pavan Kumar Naik, M. Murakami

Research output: Contribution to journalConference article

Abstract

In this study, we focus on methods to further improve the flux pinning and critical current density (J c) of disk shaped MgB2 bulk superconductors by a comparative study with locally obtained charcoal at optimized processing conditions. The doping of charcoal was varied at 0, 0.2, 0.4 and 0.6 wt%. Bulk MgB2 samples were produced by in-situ solid state reaction in Ar gas and ambient pressures at 775 °C, employing high purity of Mg metal and nano B powder mixed in a fixed ratio of Mg:B = 1:2 and optimal conditions. The phase has been investigated by X-ray diffractometer (XRD). The effects of the dopants on superconducting properties especially the field dependence of J c have been determined by superconducting quantum interference device (SQUID) and critical temperature (T c). Measurements of the magnetic susceptibility showed sharp superconducting transitions (ΔT c ∼ 1 K). J c at self-field and 20 K was determined to be ∼280 and 467 kA/cm2 for the 0 and 0.4 wt% charcoal added samples respectively. The structural and superconducting results were correlated with the addition of charcoal in the final product.

Original languageEnglish
Article number012047
JournalJournal of Physics: Conference Series
Volume1293
Issue number1
DOIs
Publication statusPublished - 2019 Oct 15
Event31st International Symposium on Superconductivity, ISS 2018 - Tsukuba, Ibaraki, Japan
Duration: 2018 Dec 122018 Dec 14

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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