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There exists several techniques to synthesize TlBaCaCuO from precursor films.Recently, a two zone furnace technique was developed by DeLuca.' Based on our experience on the two zone furnace technique, we systematically conducted a series of experiments in a tube furnace with a temperature gradient distribution. The BaCaCuO precursor films were fabricated by an ink method, and the TI diffusion source was T1203. Superconductive films were characterized by SQUID magnetization measurement, X-ray diffraction, SEM, and EDS.Experimental results will be summarized.

The effects of proton irradiation on the superconducting properties of single crystal Bi2Sr2CaCu208 are reported. Proton irradiation results in a lower transition temperature and increased transition width. Low temperature critical currents are found to increase with increasing fluence. The irreversibility line moves significantly in both the low and high field regimes. Optimal movement of the line in the high field regime is found to occur at a fluence corresponding to nearly one defect per vortex core disk. Implications on materials applications are discussed.