Microstructure and high critical current of powder in tube MgB2

Details Microstructure and high critical current of powder in tube MgB2 Microstructure and high critical current of powder in tube MgB2

2002-08-14

arxiv.org/abs/cond-mat/0208293v1

Appl. Phys. Lett. 82 (2003) 1754

Physics

Condensed Matter

Materials Science

12 pages, 3 figures, submitted to APL

Scientific paper

10.1063/1.1561572

We report dc transport and magnetization measurements of Jc in MgB2 wires fabricated by the powder-in-tube method, using commercial MgB2 powder with 5 %at Mg powder added as an additional source of magnesium, and stainless steel as sheath material. By appropriate heat treatments, we have been able to increase Jc by more than one order of magnitude from that of the as-drawn wire. We show that one beneficial effect of the annealing is the elimination of most of the micro-cracks, and we correlate the increase in Jc with the disappearance of the weak-link-type behavior.

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