Abstract
The influence of sintering temperature on the microstructure and superconducting properties of Bi 1.7Pb 0.4Sr 1.8Yb 0.2Ca 1.1Cu 2.1O 8+ δ has been investigated. Yb-free (Bi 1.7Pb 0.4Sr 2.0Ca 1.1Cu 2.1O 8+ δ ) and Yb-substituted (Bi 1.7Pb 0.4Sr 1.8Yb 0.2Ca 1.1Cu 2.1O 8+ δ ) superconducting samples are prepared by solid-state synthesis in bulk form. Significant variations in microstructure, critical current density ( J C) and flux pinning properties have been observed for Yb-substituted samples, sintered at different temperatures in the range 846–852 °C. The flux pinning force ( F P) calculated from the field dependant J C values show that the irreversibility lines (ILs) of Yb-substituted samples shift towards higher fields to different extents depending on the sintering temperature. The samples sintered at 846 °C show maximum flux pinning force of 896 kN m −3 and the peak position of F P shifts to higher fields (0.92 T) as against 16 kN m −3 and 0.12 T for the undoped sample sintered at 848 °C. But the self-field J C value of the samples sintered at 846 °C is lower than that of the samples sintered at 852 °C, which show the maximum self-field J C due to improved microstructure. The variation in microstructure followed by very high enhancement of self-field J C, J C– B characteristic and pinning force density due to Yb substitution within a narrow temperature range is of great technological relevance.
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