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Superconducting YBa2Cu3O7-δ coatings by simultaneous electrodeposition of Y, Ba, and Cu in the presence of cyanide

AutorOndoño-Castillo, S.; Fuertes, Amparo ; Pérez, F.; Gómez-Romero, P. ; Casañ Pastor, Nieves
Fecha de publicación1995
EditorAmerican Chemical Society
CitaciónChemistry of Materials 7(4): 771-779 (1995)
ResumenSimultaneous deposition in nonaqueous media (dimethyl sulfoxide) of Y, Ba, and Cu was achieved by electrolysis at constant potential in the presence of cyanide ions. Cyanide lowers the reduction potential for Cu to values near the reduction potentials for Y and Ba. Thus, an Y-Ba-Cu precursor is formed in situ over silver substrates, which upon an appropriate thermal treatment yields a YBa2Cu3O7-δ coating; further annealing in oxygen renders the material superconducting. Depending on the substrate, the complexing agent, additives, and Y:Ba:Cu stoichiometric ratios in the bath, several impurities are detected. For the best deposits obtained, Y2BaCuO5 and CuO are present in small amounts. Potassium gets deposited along with Y, Ba, and Cu, but the oxidizing thermal treatment yields a coating with no traces of potassium present. After the thermal processing, the wires obtained present bulk superconducting properties. The particle size of YBa2Cu3O7-δ in the final coating is about 10 μm. Intergranular connection is notable although the critical intergranular field is below 10 G. Tc values found are 92 K, the highest reported for YBa2Cu3O7-δ prepared by this method on metallic substrates. Typical superconducting fractions are about 60%, and Jc values at liquid nitrogen temperatures are 51 A/cm2 for deposits 96 μm thick over Ag substrates.
URIhttp://hdl.handle.net/10261/129822
DOI10.1021/cm00052a024
Identificadoresdoi: 10.1021/cm00052a024
issn: 0897-4756
e-issn: 1520-5002
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