High-Performance Bulk MgB{sub 2} Superconductor Using Amorphous Nano-boron

Journal Article · Mon Jul 15 00:00:00 EDT 2019 · Journal of Superconductivity and Novel Magnetism

DOI:https://doi.org/10.1007/S10948-018-4919-X· OSTI ID:22921197

Arvapalli, Sai Srikanth; Muralidhar, Miryala; Murakami, Masato ^[1]

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1. Shibaura Institute of Technology, Graduate School of Science and Engineering, Regional Environment Systems, Superconducting Research Laboratory (SRL) (Japan)

MgB{sub 2} bulks were produced by in situ solid-state reaction in Ar gas using high-purity commercial powders of Mg metal and amorphous nano-B mixed in a fixed ratio of Mg:B = 1:2. Single-phase materials have been obtained and grain structure and its implications are reported. All samples were sintered at 775 °C for 3 h in Ar atmosphere. X-ray diffraction results show that high-purity MgB{sub 2} phase has been fabricated, which as well is reflected in critical temperature (T{sub c} = 37.8 K). Magnetic measurements reveal a high critical current density (J{sub c}) value such as 408 kA/cm{sup 2} when nano-amorphous boron is used. SEM studies show that nano-ordered MgB{sub 2} grains are formed, thereby creating large number of grain boundaries responsible for high critical current densities. Analysis of normalized pinning force curve as a function of reduced magnetic field indicates that dominant pinning is caused by grain boundaries.

• OSTI ID: 22921197
• Journal Information: Journal of Superconductivity and Novel Magnetism, Vol. 32, Issue 7; Other Information: Copyright (c) 2019 Springer Science+Business Media, LLC, part of Springer Nature; Country of input: International Atomic Energy Agency (IAEA); ISSN 1557-1939
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
77 NANOSCIENCE AND NANOTECHNOLOGY
BORON
CRITICAL CURRENT
GRAIN BOUNDARIES
IMPURITIES
MAGNESIUM BORIDES
MAGNETIC FIELDS
MAGNETIC FLUX
NANOPARTICLES
SCANNING ELECTRON MICROSCOPY
SUPERCONDUCTORS
TEMPERATURE RANGE 0013-0065 K
TRANSITION TEMPERATURE
X-RAY DIFFRACTION