The molten salt or the flux method is utilized in this study to fabricate a grainoriented YBa2Cu3O7−x superconductor. The formation of YBa2Cu3O7−x in the presence of molten salts of Na, K, Li belonging to chloride and iodide systems does not appear feasible due to the instability of the superconducting phase in these salt systems. Studies using the “green phase,” Y2BaCuO5, as seed crystals suggest a two-stage approach in the formation of YBa2Cu3O7−x. The process uses Y2BaCuO5 formed by molten salt synthesis which has been observed to be stable in water and against most of the salts. The 211 crystals can be mixed with oxides and converted to 123. Analysis of X-ray data and SEM micrographs indicates a certain degree of grain orientation, which can be further enhanced by tape-casting or not-forging.
Volume 43, 2020
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