Preparation and critical current densities of highly textured 2212 BiSrCaCu oxide layers on silver

Abstract

Doctor blade processed green tapes and screen printable pastes on silver foil, both prepared with Bi 2 Sr 2 Ca 1 Cu 2 O x powder, were subjected to melt-texturing using melting and crystallization temperatures derived from DTA measurements. Highly textured layers were formed by slow cooling from the melting temperature to the crystallization temperature and quenching after a holding period. Quenching increased T c to 90 K. The critical current density was measured as a function of temperature and magnetic field. At 4.2 K and 77 K and 0 Tesla, critical current densities as high as 1.3 × 10 5 A/cm 2 and 1.04 × 10 4 A/cm 2 were observed, respectively. At 4.2 K and 10 Tesla a critical current density of up to 5 × 10 4 A/cm 2 was obtained, even with B ⊥ tape