Abstract
The superconducting properties of ex situ and in situ powder-in-tube (PIT) steel-sheathedMgB2 superconductors fabricated by different manufacturing techniques areexamined. Significant improvement in the critical current density ofthe explosively densified sample is observed against the correspondingJc characteristics of the extruded specimens, reaching approximately3.8 × 105 A cm − 2 in 3.2 T field at5 K. The high Jc values are maintained at fields above 5 T, which suggests that degradation of the materialproperties takes place at a later stage, making the superconductor ideal for practicalapplications. The quasi-statically consolidated specimens exhibit a more typicalbehavior where increase of the compaction level results in an enhancement of theirJc characteristics.
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