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Published on: June 18, 2013
High Critical Current Density in the Textured Nanofiber Structure in Multifilament MgB2 Wires Made by the
Daniel Gajda1, Andrzej J Zaleski1, Andrzej J Morawski2
1Institute of Low Temperature and Structure Research PAS, Okolna 2, 50-422 Wroclaw, Poland.
Abstract:
We show that the structure of multifilament MgB2 wires made by the powder-in-tube (PIT) method can be texturized by annealing the structure under high isostatic pressure. Our results show that we obtained continuous fibers with a uniform diameter of 250 nm in all 36 filaments, a small grain size of approximately 50 nm and a high density of the superconducting material. These results contribute to a significant improvement in the critical current density in high magnetic fields, e.g., 100 A/mm2 at 14 T and 4.2 K.
