Partial Melt Growth Process of Bi2Sr2Ca1Cu2Ox Textured Tapes on Silver

Abstract

Bi₂Sr₂Ca₁Cu₂O _x textured tapes with an excellent J _c were synthesized by doctor-blade casting and a melt process. Green tape was laid on a silver foil and oxide/silver composite tape was heat treated. A highly textured microstructure was formed by slow cooling from 890°C to 870°C with the oxide in a partially melted state. The highest T _c and J _c (77 K, 0 T), 89 K and 1.3×10⁴ A/cm², respectively, were obtained by quenching from 870°C. However, J _c at 4.2 K was higher for the sample slowly cooled to room temperature and reached 1.4×10⁵ A/cm² at 25 T. These results indicate the potential for the practical application of Bi-based oxide superconductors at both 77 K and 4.2 K.