High critical-current density in robust MgB[sub 2]/Mg nanocomposites

Li, Qiang; Gu, G. D.; Zhu, Y.
March 2003
Applied Physics Letters;3/31/2003, Vol. 82 Issue 13, p2103
Academic Journal
A robust and high critical-current density (J[SUBc]>1 MA/cm[SUP2] at 5 K and self-field) superconducting composite based on MgB[SUB2] has been developed. The composite consists of 75% MgB[SUB2] matrix and 25% dispersed Mg on the scale of tens of nanometers. Transmission electron microscope investigation revealed that the composites are extremely dense, and consist of nanosized MgB[SUB2] grains connected by the clean strongly coupled grain boundaries. The nanodispersed Mg can blunt crack tips and provides regions for plastic flow. Both magnetization and magneto-optical studies demonstrated that the composite is free of any weak links. Furthermore, the addition of Mg in the matrix substantially reduces the flux jumps commonly observed in the monolithic MgB[SUB2] superconductors.


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