Abstract
The present study shows general characteristic features of processes such as spray pyrolysis and heat-treatment, involved in the preparation of Tl-2223/CeO2/Al2O3 superconducting coatings by using aerosol pyrolysis method. The importance of the present study, however, lies in a new process to make a thick Tl-2223 superconducting layer by using spray pyrolysis. In the new method, a relatively thick BaCaCuO precursor film is firstly spray deposited on the buffered alumina substrate and then heat-treated in the presence of thallium source for phase transformation to superconducting phases to assign conductivity to the film. The thickness of the Tl-2223 layer was 2–3 μm. The crystal symmetry was found to be tetragonal with lattice parameters a=3.85, and c=35.7 A. The Tc was found to be 98 K for the samples heat treated at 870 °C for 60 min. Magnetic characterizations were conducted by using a DC-SQUID magnetometer. From the magnetization measurements, the intragrain critical-current density, Jc, was calculated to be 2×104 A/cm2 at 70 K.
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