High-Performance Bulk MgB2 Superconductor Using Amorphous Nano-boron
作者： Sai Srikanth Arvapalli , Miryala Muralidhar , Masato Murakami
DOI: 10.1007/S10948-018-4919-X
关键词: Magnetic field 、 Analytical chemistry 、 Pinning force 、 Boron 、 Nano- 、 Grain boundary 、 Phase (matter) 、 Amorphous solid 、 Superconductivity 、 Materials science 、 Electronic, Optical and Magnetic Materials 、 Condensed matter physics
摘要: MgB2 bulks were produced by in situ solid-state reaction Ar gas using high-purity commercial powders of Mg metal and amorphous nano-B mixed a fixed ratio Mg:B = 1:2. Single-phase materials have been obtained grain structure its implications are reported. All samples sintered at 775 °C for 3 h atmosphere. X-ray diffraction results show that phase has fabricated, which as well is reflected critical temperature (Tc 37.8 K). Magnetic measurements reveal high current density (Jc) value such 408 kA/cm2 when nano-amorphous boron used. SEM studies nano-ordered grains formed, thereby creating large number boundaries responsible densities. Analysis normalized pinning force curve function reduced magnetic field indicates dominant caused boundaries.
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