Abstract
Critical current densities J/sub c/ have been measured by both the resistive and the magnetic methods at various temperatures and magnetic fields for grain-oriented Bi/sub 2/Sr/sub 2/Ca/sub 1/Cu/sub 2/O/sub x//Ag composite tapes which were prepared by the combined process of doctor blade casting and crystal growth from the partially molten state. At 77 K, J/sub c/ of the tapes was greater than 10/sup 4/ A/cm/sup 2/ in zero magnetic field. However, J/sub c/ at 77 K is very sensitive to an applied magnetic field due to the large flux creep. This sensitivity of J/sub c/ to the magnetic field is significantly reduced at lower temperatures such that J/sub c/'s of a practical level ( approximately 10/sup 5/ A/cm/sup 2/) are obtained at fields above 25 T at 4.2 K. The textured tape has an anisotropy in J/sub c/ with respect to magnetic field direction. This anisotropy increases with increasing temperature. However, the anisotropy factor at 4.2 K is small ( approximately 1.5) and should not limit practical application.
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