TITLE:
BPSCCO Superconducting Films Grown by Spray Pyrolysis Technique: Systematic Study of the Relationship between Pb Content and Annealing Conditions
AUTHORS:
Y Elvia Díaz Valdés, Concepción Mejía García, Ana María Paniagua Mercado, Arturo Méndez Sánchez
KEYWORDS:
Superconductivity; BPSCCO Superconducting Films; Spray Pyrolysis Deposition; Pb Content; Annealing Conditions; Experimental Design
JOURNAL NAME:
Advances in Materials Physics and Chemistry,
Vol.2 No.4B,
January
16,
2013
ABSTRACT: 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(NO3)3, Pb(NO3)2, Sr(NO3)2, Ca(NO3)2 and Cu(NO3)2, with a subsequent solid state reaction for growing the Bi-based superconducting phases. Annealed 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 3III4-2. Interrelation between Pb content, ta and Ta exists. The presence of Pb is necessary to stabilize the high-Tc phase but its content depends on the annealing conditions.