BPSCCO Superconducting Films Grown by Spray Pyrolysis Technique: Systematic Study of the Relationship between Pb Content and Annealing Conditions

Y Elvia Díaz Valdés, Concepción Mejía García, Ana María Paniagua Mercado, Arturo Méndez Sánchez

Departamento de Física, Escuela Superior de Física y Matemáticas – IPN Edif. 9 UPALM Col. San Pedro Zacatenco, Deleg. GAM, México 07737 México.

DOI: 10.4236/ampc.2012.24B025                

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 ³III_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.
 

Keywords

Superconductivity; BPSCCO Superconducting Films; Spray Pyrolysis Deposition; Pb Content; Annealing Conditions; Experimental Design

Conflicts of Interest

The authors declare no conflicts of interest.

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