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Superconducting MgB2 tapes using mechanically alloyed nanocrystalline precursor powder

Wolfgang H. Haessler 2Olaf Perner 2Claus Fischer 2Konstantin Nenkov 2Christian Rodig 2Margitta Schubert 2Bernhard Holzapfel 2Ludwig Schultz 2J├╝rgen Eckert 1

1. Technische Universitat Darmstadt, Darmstadt, Germany
2. Institut fuer Metallische Werkstoffe, IFW, Dresden, Germany

Abstract

It was demonstrated that nanocrystalline MgB2 samples obtained by mechanical alloying show improved superconducting properties. Monofilamentary and
19 filamentary tapes with Fe sheath have been prepared by the powder-in-tube (PIT) method using mechanically alloyed precursor powders consisting of the constituents Mg, B, and MgB2. With this precursor the tapes can be annealed at relatively low temperatures of 500...600C. For the 19 filamentary tape Jc values up to 35 kA/cm2 and 9 kA/cm2 in fields of 7.5 T and 10 T, respectively, were measured at 4.2 K. Investigation of the microstructure by optical microscopy, SEM/WDX and XRD have shown that the high Jc values may be mainly due to the remarkably small grain size of the MgB2 phase and defects particularly precipitates of magnesium oxide. The properties of tapes with iron sheath are compared to those with Cu-sheath.

 

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Related papers

Presentation: poster at E-MRS Fall Meeting 2004, Symposium E, by Wolfgang H. Haessler
See On-line Journal of E-MRS Fall Meeting 2004

Submitted: 2004-05-19 14:34
Revised:   2009-06-08 12:55