Abstract
YBa 2Cu 3O 7−δ (123) ceramic superconductors and YBa 2Cu 3O 7−δ-Ag composite superconductors have been prepared by the citrate method. Microstructural analyses have been done by X-ray diffractometry and optical ceramography. The superconducting behavior has been studied by 4-probe dc resistivity in the 77 K–140 K temperature range. Silver percolation in the ceramic matrix was studied by electrical resistivity measurements at room temperature; the percolation threshold was found to be approximately 25 vol% (35.5 wt%) Ag. Specimens with silver addition showed improvement in the flexural strength of the 123 compound. The main results show that the critical temperature does not depend on the silver content in the composite specimens, and that approximately 3 wt% (1.8 vol%) Ag doping yields an optimized composite superconductor from the microstructural point of view, with platelet-like grain shapes.
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