High critical current density in iron-clad MgB[sub 2] tapes

Fang, H.; Padmanabhan, S.; Zhou, Y. X.; Salama, K.
June 2003
Applied Physics Letters;6/9/2003, Vol. 82 Issue 23, p4113
Academic Journal
Iron-clad MgB[SUB2] superconducting tapes with a MgB[SUB2] core cross-section area of 1.07 × 10[SUP-3] cm[SUP2] were fabricated using the standard powder-in-tube method. The starting precursor was ultrafine Mg and B mixture powder prepared by high-energy ball milling. Very good grain connections as well as grain refinement were obtained in tapes annealed at 850 °C. Under a 1.5-T external magnetic field, J[SUBc] is 1.07 × 10[SUP5] and 6.54 × 10[SUP3] A/cm[SUP2] at 20 and 30 K, respectively. An extrapolation to zero field at 20 K gives a J[SUBc] of 3.0 × 10[SUP5]A/cm[SUP2].


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