Abstract
The microstructural requirements of a superconducting wire, with a core of high temperature superconductor ceramic (HTSC), are long and platy grains, with good percolation from grain to grain to allow a high critical current. This microstructure is encouraged by growth from a liquid phase.In earlier work in both Tl- and Bi-HTSC, we found that a liquid phase was also necessary to crystallize the three-Cu-layer 2223-types by solution-reprecipitation; without liquid none formed. It was of interest to see if the same type of situation applies to the Tl- 1223 case, which is attracting increasing attention due to its superior flux-pinning properties. The immediately available sample was a gold encapsulated wire with a core of (Pb0.5Tl0.5)(Sr1.6Ba0.4)Ca2Cu3Ox, made by a published technique, and which had been prefired to 800°C. The sample was subsequently fired in a constant temperature gradient furnace (2°C/cm) for 100h. Samples were mounted, sectioned, polished and gold coated for characterization by BSE imaging and EDS elemental mapping.
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