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Microstructure and high critical current of powder in tube MgB2

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arxiv cond-mat/0208293 v1 pith:LMMSRNKU submitted 2002-08-14 cond-mat.mtrl-sci

Microstructure and high critical current of powder in tube MgB2

A. Serquis , L. Civale , D.L. Hammon , J.Y. Coulter , X.Z. Liao , Y.T. Zhu , D.E. Peterson , F.M. Mueller This is my paper
classification cond-mat.mtrl-sci
keywords mgb2powderincreaseableaddedadditionalannealingappropriate
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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