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immagine_testata

Large transport critical currents in unsintered MgB2 superconducting tapes

16/12/2011

 

APPLIED PHYSICS LETTERS, VOLUME 79, NUMBER 2, 9 JULY 2001

Giovanni Grasso, Andrea Malagoli, Carlo Ferdeghini, Scilla Roncallo, Valeria Braccini,
and Antonio S. Siri
INFM-Research Unit of Genova, Via Dodecaneso 33, 16146 Genova, Italy
Maria R. Cimberle
CNR/CFSBT, Via Dodecaneso 33, 16146 Genova, Italy

The powder-in-tube process has been employed to fabricate tape-like conductors with a strong
metallic sheath and based on the newly discovered MgB2 superconducting phase. Long
superconducting tapes have been prepared by packing reacted MgB2 powders inside pure Ag, Cu,
and Ni tubes which are then cold worked by drawing and rolling. Such tapes have shown transport
properties as good as bulk MgB2 samples sintered in high pressure and high temperature conditions.
At 4.2 K, the highest critical current density of 105 A/cm2 has been achieved on nickel-sheathed
single-filament conductors. A direct correlation between the sheath tensile strength and the critical
current of the unsintered tape has been observed.

http://apl.aip.org/resource/1/applab/v79/i2/p230_s1?isAuthorized=no