ELECTROCHEMICAL-BEHAVIOR OF SUPERCONDUCTING BI1.4PB0.6SR2CA2CU3O10 INHALIDE-CONTAINING ACETATE BUFFER

Electrochemical responses of Bi1.4Pb0.6Sr2Ca2Cu3O10 in various buffere d halide solutions were studied. Electrochemical surface alterations i n the anodic and cathodic potentials were investigated by x-ray diffra ction (XRD) of the surfaces after potentiostatic exposures in the diff erent media. The principal electrochemical reactions involved in alter ation of the surface of the superconductor were identified by consider ing its potentiodynamic response as well as the post-exposure surface constitution. Formation and stability of bismuth (Bi) and bismuth trio xide (Bi2O3) were found to be significant in deciding the surface comp osition after electrochemical exposure in acetate buffer and buffers c ontaining chloride (Cl-) and fluoride (F-). The electrochemical proces s was controlled by chemical reaction and diffusion in the presence of iodide (I-).