Abstract
Silver-clad tapes of highT c Bi-Pb-Sr-Ca-Cu-O superconductors have been fabricated through the powder-in-tube method. The critical current density, J c , of a thick tape was 534 A.cm−2 (77 K, 0 T). Subsequent rolling and sintering of the tapes led to a gradual decrease inJ c, instead of the expected increase. This was caused by the microcracks developed in the core material by a rather drastic reduction during the rolling of the tapes. A modified and well controlled rolling technique, on the other hand, resulted in much improvedJ c values. Repeated rolling and sintering resulted in a good grain alignment and no microcracks were observed. In the present studies, maximumJ c of 1846 A.cm−2 (77 K, 0 T) and 2.43 × 104 A.cm−2 (4.2 K, 0 T) have been obtained Optimization of the processing and sintering parameters are expected to lead to still higherJ c values.
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Shukla, S.R., Reddy, Y.S., Pandya, D.K. et al. Role of processing in improving the critical current of Ag/BPSCCO tapes. Pramana - J Phys 37, 333–344 (1991). https://doi.org/10.1007/BF02848485
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DOI: https://doi.org/10.1007/BF02848485