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Evolution of Electromagnetic Properties and Microstructure With Sintering Temperature for {\hbox {MgB}}_{2}/{\hbox {Fe}} Wires Made by Combined In-Situ/Ex-Situ Process

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6 Author(s)
Li, W.X. ; Inst. for Supercond. & Electron. Mater., Univ. of Wollongong, Wollongong, NSW, Australia ; Zeng, R. ; Zhang, Y. ; Xu, X.
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The influences of microstructure, connectivity, and disorder on the critical current density, Jc, are discussed to clarify the different mechanisms of Jc(H) in different magnetic field ranges for in-situ and combined in-situ/ex-situ MgB2/Fe wires. Sintering temperature plays a very important role in the electromagnetic properties at different temperatures and under various magnetic fields. Connectivity, upper critical field, Hc2 , and irreversibility field, Hirr, are studied to demonstrate the mechanism of Jc dependence on magnetic field. The combined in-situ/ex-situ process is proved to be a promising technique for fabrication of practical MgB2 wires.

Published in:

Applied Superconductivity, IEEE Transactions on  (Volume:21 ,  Issue: 3 )

Date of Publication:

June 2011

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