Precursor Influence on the Electrical Properties of Textured Bi-2212 Superconductors
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Several synthetic methods, solid-state, sol-gel and polymer solution methods, have been used to prepare prereacted precursors, as well as a vitreous material obtained by melt quenching. The influence of the starting powder characteristics on the phase formation, microstructure, T c and J c of Bi-2212 textured rods prepared by directional crystallization from the melt has been analyzed. In all the cases, high transport critical current values (higher than 3000 A/cm2 at 77 K) have been obtained, independently of the precursor type. Samples obtained by the polymer route show improved T c values, associated to a lower oxygen content.
KeywordsBi-2212 Resistivity Critical current Synthesis Directional growth
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