Abstract
Abstract We have studied the crystallization process in the Bi-Pb-Sr-Ca-Cu-O system from an amorphous state, and we have characterized the superconducting properties of thick film samples prepared on MgO substrates by annealing. A rapidly quenched sample showed amorphous nature. After this sample was annealed at 500°C, Bi2Sr2CuO x phase was found. At 650°C, the Bi2Sr2CaCu2O y phase appeared. The sample at 800°C consisted of the Bi2Sr2CaCu2O y phase, while the Bi2Sr2Ca2Cu3O z phase occurred at 850°C. Thick film samples were prepared by annealing at 855°C, the partial melting temperature, for 1-400 h. A short-time annealed sample showed semiconducting behavior in the normal conducting state, but longer annealing showed the more remarkable metal-superconducting transition. This was considered to be due to oxygen deficiency and weak coupling at grain boundaries. The highest Tc(0) is 91 K in a sample annealed for 400 h., although it consisted of high-Tc and low-Tc mixed phases.
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