Abstract
IV characteristics have been studied for monocore Ag sheathed Bi-2223 tapes, fabricated from both sol-gel and mechanically-milled precursor powders. Results have been obtained with the c-axis of the sample both parallel and perpendicular to the applied field, together with the force-free orientation. The angular dependence of the critical current has also been measured. The IV characteristics have been analysed in terms of their n-value and second-differential. The spatial dependence of the critical current has been measured using a scanning Hall probe. The results suggest that the transport current follows a percolative path which is limited by current flow in the c-axis direction, and that most of the current flows in a thin layer of highly aligned Bi-2223 grains near to the Ag sheath. The limiting mechanism in the c-axis direction is thought to be weak-link grain boundaries.
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Ramsbottom, H.D., Ito, H., Horita, T., Matsuno, K., Osamura, K. (1998). Transport Critical Current Density Distributions in Ag/Bi-2223 Tapes. In: Balachandran, U.B., Gubser, D.G., Hartwig, K.T., Reed, R.P., Warnes, W.H., Bardos, V.A. (eds) Advances in Cryogenic Engineering Materials . Advances in Cryogenic Engineering, vol 44. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-9056-6_91
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