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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- 2.Hermann, P.F.: Handbook of Applied Superconductivity. IOP Publishing, Bristol (1998) Google Scholar
- 11.Shi, D.: High Temperature Superconducting Materials Science and Engineering. Pergamon Press, Oxford (1995) Google Scholar
- 22.Hull, D.: Fractography: Observing, Measuring and Interpreting Fracture Surface Topography. Cambridge University Press, Cambridge (1999) Google Scholar