Abstract
Superconducting Tl2Ba2Ca2Cu3O10 films with zero-resistance temperature over 120 K have been prepared on various substrates. Precursor BaCaCuO films were deposited by spray pyrolysis at 350-400 degrees C followed by a short time heating at 850 degrees C. Thallium was incorporated by annealing the precursor films with crude TlBaCaCuO bulk pellets in a covered alumina crucible in an oxygen atmosphere at 830 degrees C for 30 minutes and then at 810 degrees C for 16 hours. X-ray diffraction showed that the final superconducting films are mainly of 2223 phase and are highly oriented with the c-axis perpendicular to the surface of the substrate. The critical transport current density (Jc) of the films is near 10000 A cm-2.
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