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 articlepeer-review

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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