Addition effects of MgO on structure and physical roperties in Bi-2212 ceramics

The effect of magnesium on the microstructural and superconducting characteristics of bulk Bi2Sr(2)CaCu(2)MgxOy superconductors with x=0 to 0.05 by solid reaction has been examined in this study. Bi2Sr(2)CaCu(2)O(8+)(d) is formed as the primary phase, and Bi2Sr2CuO8+d (Bi-2201) is present as the parasitic phase, according to XRD data. In doped samples, the c lattice parameter decreases, indicating that Mg has entered the Bi2Sr(2)CaCu(2)O(8+)(d) crystallographic unit cell. The grain morphology of the samples containing magnesium has changed significantly, and the lamellar structure typical of high temperature superconductors can be seen in the SEM micrographs. The critical temperatures, T-coff and Tconset, are raised by the addition of Mg, delimiting the superconductive transition. Tconset's maximum value corresponds to x = 0.05.