Abstract
Silver-clad Bi1·7Pb0·4Sr1·8Ca2Cu3·5O x (BPSCCO) tapes have been fabricated using low purity (98–99%) starting materials and following the powder-in-tube technique. MaximumJ c values of 6·14 × 103 A·cm−2 at 77 K and 1·4 × 105 A·cm−2 at 4·2 K have been obtained in tapes subjected to the process of intermediate rolling and sintering. The bulk superconducting material used for the tape-fabrication contains both 2223 and 2212 phases in the ratio 60:40. A pure phase material and the optimization of the sintering parameters are expected to yield much higherJ c values at 77 K. It is possible that the copper-rich phase(s) and/or a small amount of iron impurity (60 ppm) present in CuO might be acting as flux pinning sites and could be responsible for highJ c values.
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Shukla, S.R., Reddy, Y.S. & Sharma, R.G. Critical current in Ag/BPSCCO tapes using low purity materials. Pramana - J Phys 38, 179–188 (1992). https://doi.org/10.1007/BF02848270
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DOI: https://doi.org/10.1007/BF02848270