Abstract
Abstract Homogeneous thick films (0.34.35 mm thick) of glassy (Bi3Pb1)Sr3Cu3Cu4−n Ti n Ox, precursors with low (n = 0–0.0075) concentrations of Ti have been prepared by a fast-quenching technique and characterized by X-ray diffraction and scanning electron microscopy studies. By annealing these as-quenched glasses above their respective glass transition temperatures T g, mostly the Bi-2212-type superconducting phase is obtained. The effect of Ti doping is to decrease the glass melting temperature as well as the annealing temperature (for making the ceramic phase, hereafter termed glass-ceramic (GC) phase) by about 20°C. The addition of Ti also reduces the formation of the high-T c 2223 phase. However, the superconducting transition temperature Tc decreases linearly with increasing Ti content. The Abrikosov-Gor'kov pairbreaking mechanism is found to be satisfied. All these GC samples (except the n = 0.00 sample) follow Mott's variable-range hopping conduction mechanism above the superconducting transition ...
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