화학공학소재연구정보센터
Journal of Electroanalytical Chemistry, Vol.420, No.1-2, 21-24, 1997
Towards the Electrochemical Manufacture of Superconductor Precursor Films in the Presence of an Ultrasonic-Field
Films of Tl-Pb-Sr-Ca-Cu superconductor precursor material have been synthesised. The films were electrodeposited onto polished Ag substrates, with and without the presence of an ultrasonic field in the solution, by applying a pulsed potential sufficiently large to cause reduction of the appropriate metallic cations. The deposition solution was composed of dehydrated metallic nitrate salts dissolved in dimethylsulfoxide. The morphology, and the compositions, of the films were analysed using scanning electron microscopy and emission dispersive spectroscopy respectively. Deposition in the presence of the ultrasonic field showed an increased deposition current, by a factor of 4, caused by mass transfer enhancements as a result of cavitation effects produced by the ultrasonic irradiation of the solution. These films were denser compared with those deposited without the presence of the ultrasound, displaying a void percentage of around 45%, and also displayed greater morphological homogeneity.