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- W1973531122 abstract "We report on the fabrication and characterization of disk-shaped bulk MgB 2 superconductors with high performance as superconducting bulk magnets. Several samples of diameters 20 mm, 30 mm and 40 mm were fabricated using a solid state reaction in pure Ar atmosphere at 775°C for 3h. The magnetization measurements confirmed that all the samples exhibited a sharp superconducting transition with T c (onset) at around 38.5 K. The samples showed respective critical current density ( J c ) values of 176 kA cm -2 and 55 kA cm -2 at 20 K in self field and 1T. The J c values increased further to 250 kA cm -2 and 100 kA cm -2 with decreasing temperature down to 10 K. MgB 2 samples 20 mm and 30 mm in diameter and 7 mm in thickness exhibited trapped field values of 1.15 T and 1.3 T at 25 K, respectively. Microstructural observations with scanning electron microscopy (SEM) revealed that the samples are highly porous. And hence, continuing development of large-sized bulk MgB 2 with higher density will lead to promising industrial applications." @default.
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- W1973531122 date "2014-10-31" @default.
- W1973531122 modified "2023-09-25" @default.
- W1973531122 title "Fabrication of MgB<sub>2</sub> Bulk Magnets with High Critical Currents" @default.
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- W1973531122 doi "https://doi.org/10.4028/www.scientific.net/ast.95.196" @default.
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