Improvement in the Crystallographic Phase Content and Superconducting Properties of Mechanically Alloyed MgB2
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In this paper, the results of the superconductivity evaluation of MgB2 intermetallic-based superconducting materials prepared through mechanical alloying are reported. The formation of the MgB2 intermetallic phase took place through an intermediate phase reaction at the solid-state reaction temperature, which tends to favor single-phase materials. The annealing of mechanically milled Mg and B powders resulted in the highest mass fraction of MgB2 observed in this study, reaching more than 90% after annealing at 900 °C for 1 h. At that point, there were still second phases present consisting of Mg, MgO, and Fe2B. Improved superconducting properties were obtained in samples sintered at temperatures of 850 °C and 900 °C that had a low resistivity, low critical temperature gap values, and a high residual resistivity ratio (RRR).
KeywordsMgB2 High-energy ball milling Annealing Superconducting Resistivity
The authors gratefully acknowledge the support of the Postgraduate Program of Materials Science Universitas Indonesia and Graduate School of Arts and Science, Iwate University for the research facilities.
This work received financial support provided partially by the Directorate of Research and Community Service Universitas Indonesia under program Grants of Doctoral Dissertation 2018 contract no: 1332/UN2.R3.1/HKP.05.00/2018 (TADOK 2018) and competency funding of the Research Centre for Metallurgy and Material, Indonesian Institute of Science 2018 from the Ministry of Research, Technology and Higher Education, Indonesia.
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