Abstract
Ag/MgB 2, Cu/MgB 2 and SS/MgB 2 (stainless) tapes were fabricated by the oxide powder-in-tube method. X-rays diffraction studies showed the formation of moderate c-axis texturing in the MgB 2 core, which increases with the sheath strength and correlates with the core microhardness. Magnetization hysteresis loops of the tapes were measured for applied magnetic field ( H) parallel and normal to the tape plane, in a wide range of H (0–5 T) and temperature (5–25 K). The critical current density ( J cm), calculated using the extended Bean model, indicates the possible current limitation due to inter-particle links. Significant anisotropy in J cm is observed. The “parallel” J cm is one order of magnitude higher than the “normal” J cm which is of the same order of magnitude as transport J c in non-sintered tapes. This anisotropy is assumed to be originated from the weak large-scale connectivity (deformation-induced crack formation) in densified MgB 2 core after the rolling process.
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