Abstract
Abstract In this paper we report on the processing parameters and resulting critical current densities of Bi 2 Sr 2 CaCu 2 O x (Bi-2212) thick films on polycrystalline MgO substrates. Bi-2212 tapes were cast by the doctor blade technique and laminated onto flat MgO-ceramic substrates. The tapes were produced via the partial melt-process in a single cycle. Silver(I)oxide (Ag 2 O) was added to the powder and the maximum process temperature was varied in order to optimize the transport current density at 77 K in self-field. It was found that both parameters, maximum process temperature during partial melting and amount of Ag 2 O added have a strong influence on the critical current density at 77 K. The highest J c of 1900 A/cm 2 was achieved in the 130 μm thick films with an addition of 4 wt% Ag 2 O processed at a maximum temperature of 900 °C. In addition, large components were processed with 1 cm wide conductors meandering over 150 cm on 20 cm diameter MgO plates.
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