Actually recent investigation in developing semiconducting-superconducting composites based in CdS and Bi-based superconductors has attracted interest in processing thin superconducting films. In this work are reported Bi-Pb-Sr-Ca-Cu-O (BPSCCO) thin films grown on MgO substrates by spray pyrolysis technique from a solution containing Bi(NO 3 ) 3 , Pb(NO 3 ) 2 , Sr(NO 3 ) 2 , Ca(NO 3 ) 2 and Cu(NO 3 ) 2 , with a subsequent solid state reaction for growing the Bi-based superconducting phases.

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... aled films were characterized by X-ray diffraction, atomic absorption spectroscopy and resistance measurements. Interdependence between Pb content, annealing time and temperature, in the formation of superconducting phases was studied applying a fractional factorial design 3 III 4-2 . Interrelation between Pb content, t a and T a exists. The presence of Pb is necessary to stabilize the high-T c phase but its content depends on the annealing conditions. Figure 5. Resistance vs. temperature measurements of the samples no. 1, 2, 4, 5, 6, 7 and 9.