We report for the first time the influence of fluorine implantation in the Bi-Sr-Ca-Cu-O system. The incorporation of fluorine was found to enhance the zero resistance temperature and to sharpen the high-temperature transition. The fluorinated sample exhibited Tc (R=0)=89 K and the high Tc phase of the composition had Tc (on) as high as 124 K with an extrapolated Tc (end) of 114 K. Resistance temperature characteristics of a sample before and after fluorine implantation are presented.

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The fabrication of thick superconducting films of the Bi-Sr-Ca-Cu-0 system on alumina substrate is reported. The investigation shows a strong dependence of the superconducting properties on annealing conditions. An optimal temperature-time combination is required to obtain superconduction in the film, which largely depends on the ambient to which the film is subjected for heat treatment. The best results we could achieve are T, (onset) = 90 K and T, (zero) at 75 K in thick films (-50 pm). Resistancetemperature (R-T) characteristics, SEM surface topography and elemental composition of the superconducting films are described.

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