Melt Growth of Bi-Sr-Ca-Cu-O Superconducting Sheets and Filaments
We utilized a liquid-phase process for the solidification of high-Tc superconducting sheets and filaments from a melted mixture of the oxide powders Bi2O3, SrO, CaO, and CuO in approximately 1:2:2:2 molar ratios. Alumina sheets up to 13-mm wide and various filament materials with diameters ranging from 100 µm to 2.5 mm were coated with thin Bi-Sr-Ca-Cu-O layers by passage through the liquid mixed oxides and subsequent solidification. Coating rates between 2 and 1800 mm/min were used, and film thicknesses between 5 µm and 500 µm were attained. After annealing at 875°C for several hours, the coatings exhibited a superconducting transition onset near 80 K. We also report on a Bi-Sr-Ca-Cu-O wire casting technique.
KeywordsContinuous Coating Sheet Coating Melted Mixture Solar Energy Research Institute Thin Film Deposition Technique
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