Properties of Ag-Sheathed Bi-Pb-Sr-Ca-Cu-O Superconducting Tapes Prepared by the Intermediate Pressing Process

Abstract

The influence of an intermediate pressing process on the superconducting properties of Ag-sheathed Bi-Pb-Sr-Ca-Cu-O superconducting tapes has been investigated. The critical current density ( J c ) was improved by the effect of the uniaxial pressing and by a sintering process after the initial sintering. The maximum transport J c at 77.3 K under zero magnetic field was indicated as 2.36×10 4 A/cm 2 , and that at 4.2 K under zero magnetic field was indicated as 1.5×10 5 A/cm 2 . The magnetic field dependence on the J c at 4.2 K was summarized as follows: 5×10 4 A/cm 2 ( I ⊥ H , C -axis⊥ H , 10 T) and 3×10 4 A/cm 2 ( I ⊥ H , C -axis// H , 10 T).