Superconducting properties of Bi-Sr-Ca-Cu-O crystallized glass

This paper reports the crystallization and superconducting properties of Bi4Sr3Ca3Cu4Ox glass-ceramics. The glass was prepared using the conventional melt-quenching method. X-ray diffraction pattern has shown that the annealing at temperature of 800 degrees C converted the glass into glass-ceramics with Bi2Sr2CaCu2Ox superconducting phase (2212-phase). The superconducing transition exhibits the change in the slope that is characteristic for two different superconducting phases. It is observed that T-c(zero) increases from 20 K to 80 K with increasing time of annealing. The influence of magnetic field on the superconducting transition has been investigated. Our studies revealed a remarkable broadening of the resistive transition as a function of temperature with increasing field. The temperature width (T-c-T) of the transition for both phases increases with magnetic field according to Tinkham model.