Microstructures and J_c-B Characteristics of Ag-Sheathed Bi-Based Superconducting Wires

Abstract

We prepared silver-sheathed BiPbSrCaCuO wires by the powder-in-tube method. Maximum critical current densities at 77.3 K were 5.4×104 A·cm-2 in a zero magnetic field, 4.2×104 A·cm-2 at 0.1 T and 1.2×104 A·cm-2 at 1 T. At 77.3 K, as the J c improves, the history effects decrease. J c and J c-B enhancements are due to the decrease and dispersion of nonsuperconducting phases, and to grain boundary improvements.

High temperature superconductor (HTS) wires and tapes

“…The reason for the success has been the formation of micaceous grains of BSCCO with a high aspect ratio and the ability to align these grains along the direction of tape rolling. Critical current density over 50 000 A/cm 2 have been achieved in short samples of © Woodhead Publishing Limited, 2012 BSCCO fabricated by the PIT technique (Ueyama et al 1991). It is remarkable that weak-link behaviour is not prominent in BSCCO grain boundaries, even though only c-axis alignment and no signifi cant alignment of a-and b-axes is achieved in tapes fabricated by the PIT technique.…”

Effects of Optimum Annealing Time on Superconducting Properties of Bi2?xPbxSr2Ca2Cu3Oy System

“…They reported the results of Vickers microhardness of the Bi 2± ±x Pb x Sr 2 Ca 2 Cu 3 O y superconductor at different loads. However, most of the investigations have been made with the indentation techniques [10,11].…”

Influence of Ca2PbO4 on Phase Formation and Electrical Properties of (Bi,Pb)2Sr2Ca2Cu3O10/Ag Superconducting Composites

“…Silver-sheathed Bi2223 composite tapes with critical current density (J c ) at a level of 10 4 A/cm 2 (77 K) and lengths up to 1000 m have been achieved. [2][3][4][5][6] These advances have brought Bi2223 to a stage where commercialization is under consideration.…”