Abstract
Screen printed pastes and Doctor blade processed green tapes prepared from Bi2Sr2CaCu2O8 powder were subjected to a melt-texturing process on silver foil. Melting and crystallization temperatures were determined using DTA analysis. Highly textured layers were formed by slow cooling from the melting temperature to the crystallization temperature and quenching after a holding period. At 4.2 K and 77 K critical transport current densities j c as high as 1.3 × 105 A/cm2 and 1.1 × 104 A/cm2, respectively were obtained in zero field. These values are in good accordance with critical current densities j cm determined by magnetization measurements. j c‖ (B ‖ tape) can be related to j c⊥ (B ⊥ tape) assuming that the field component B ‖ c-axis alone controls j c (B,T). The analysis results in an average misorientation of the c-axes of the grains of about six degrees. This is directly confirmed by SEM micrographs.
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