The electrochemical behavior of Bi(Pb)SrCaCuO superconductors in aqueous solutions

Electrochemical behavior of Bi(Pb)SrCaCuO superconductors was studied by potentiodynamic scanning in different aqueous solutions with a concentration of 0.1 M. The electrochemical stability, which is dependent on the passivation region and pH value of the aqueous solution, of the Bi 2Sr 2CaCu 2O x (2212) phase is superior in H 2SO 3(aq) and H 3PO 4(aq), while that of the Bi 2Sr 2Ca 2Cu 3O y (2223) phase is superior in NH4OH (aq), KCl (aq) and H 2SO 4(aq). Passivation was observed in H 2SO 4(aq) and H 3PO 4(aq) for both phases. These solutions are thus possible etchants in lithography for these superconductors. The phase on the etched surface of the 2212 or 2223 BiSrCaCuO superconductor remained unchanged after potentiodynamic study in KCl (aq) and H 2SO 3(aq).