Large transport critical currents in unsintered MgB[sub 2] superconducting tapes

Grasso, Giovanni; Malagoli, Andrea; Ferdeghini, Carlo; Roncallo, Scilla; Braccini, Valeria; Siri, Antonio S.; Cimberle, Maria R.
July 2001
Applied Physics Letters;7/9/2001, Vol. 79 Issue 2
Academic Journal
The powder-in-tube process has been employed to fabricate tape-like conductors with a strong metallic sheath and based on the newly discovered MgB[sub 2] superconducting phase. Long superconducting tapes have been prepared by packing reacted MgB[sub 2] 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 MgB[sub 2] samples sintered in high pressure and high temperature conditions. At 4.2 K, the highest critical current density of 10[sup 5] A/cm[sup 2] 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. © 2001 American Institute of Physics.


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