Open AccessProcessing and Characterization of Charcoal Added Bulk MgB2 Superconductor
Author(s) -
Longji Dadiel,
M. Muralidhar,
Sai Srikanth Arvapalli,
S. Pavan Kumar Naik,
Masato Murakami
Publication year - 2019
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1293/1/012047
Subject(s) - superconductivity , diffractometer , materials science , analytical chemistry (journal) , dopant , doping , squid , charcoal , activated charcoal , flux pinning , condensed matter physics , high temperature superconductivity , chemistry , metallurgy , adsorption , composite material , physics , scanning electron microscope , ecology , optoelectronics , chromatography , biology
In this study, we focus on methods to further improve the flux pinning and critical current density ( J c ) of disk shaped MgB 2 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 MgB 2 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 (Δ T c ∼ 1 K). J c at self-field and 20 K was determined to be ~280 and 467 kA/cm 2 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.