Electrodeposition of high-Tc superconducting Bi-Sr-Ca-CuO nanostructures

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Conference Proceeding

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We report on the reproducible growth of superconducting (Bi 1-xPbx)2Sr2CuO6+δ and (Bi1-xPbx)2Sr2Ca 2Cu3O10+δ nanostructures, which has been a major difficulty in the electrochemical deposition of thin films of BSCCO. The precursors of superconducting Bi(Pb)-Sr-Ca-CuO were electrodeposited in an electrolytic bath prepared from the nitrate salts of the constituent metals in an organic solvent, dimethylsulfoxide (DMSO). The superconductor was electrodeposited in the form of nanotubes and nanowires depending upon the substrate in use - polycarbonate or alumina membranes with different pore sizes. The as-deposited samples were given a controlled oxidative thermal treatment in air. The influence of deposition potential, annealing temperature and pH was studied and optimized to get the desired stoichiometry, 2201 and 2223 phase of superconducting Bi(Pb)-Sr-Ca-CuO. A novel three-step electrodeposition scheme was implemented to control the elemental stoichiometry specifically, the oxygen stoichiometry in the sample. Characterization was done using XRD for detecting the crystal structure, EDS for the elemental composition, SEM for qualitative measurements and PPMS for the transport properties of the electrodeposited and annealed nanostructures. A plausible theoretical interpretation is given to explain the purpose behind the electrodepositing nanostructures. ©The Electrochemical Society.

Publication Source (Journal or Book title)

ECS Transactions

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