Abstract
An alternative melt-processing technique has been developed for the fabrication of Bi 2Sr 2CaCu 2O y (Bi-2212) thick films at temperatures over 100°C lower than those employed in conventional Bi-2212 melt processing. Isothermal melt processing combines the melting and solidification steps at the same temperature [T.G. Holesinger et al., Appl. Phys. Lett. 63 (1993) 982]. This technique is possible due to the large drop in the solidus temperature with decreasing oxygen partial pressure. High-quality thick films were processed at temperatures as low as 770°C. Such films were found to be well-textured, contain relatively few secondary phases, and possess critical current densities over 1 × 10 5 A/cm 2 at 4 K in self-field.
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