Abstract
We used a liquid-phase process to coat thin rods or wires and flat sheets with the Bi 2Sr 2CaCu 2O 8-type high-temperature superconductor. Reaction temperatures in the range 950–1150°C form a liquid from mixed oxide starting powders Bi 2O 3, SrO, CaO, and CuO. Substrates passed through the liquid are coated with a multiphase layer that includes a superconducting phase of approximate composition Bi 2Sr 2Ca 0.8Cu 2O 8. Connectivity between grains of the superconducting phase is sufficient to achieve superconductivity of the coating as a whole (after suitable post-growth annealing) for a surprisingly large range of starting oxide powder compositions. Analytical results for the composition of some of the observed phases were obtained through energy dispersive spectroscopy and electron-probe microanalysis. The superconducting properties were determined by low-field AC magnetic susceptometry and four-contact resistivity measurements for temperatures between 5 and 100 K. Superconducting transition onsets above liquid nitrogen temperature were observed for several starting compositions. Continuous coating has been demonstrated for thin rods and wires in lengths up to 170 mm.
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