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

This paper reports the crystallization and superconducting properties of Bi 4Sr3Ca3Cu4Ox glass-ceramics. The glass was prepared using the conventional melt-quenching method. X-ray diffraction pattern has shown that the anneali ng at temperature of 800 degrees C converted the glass into glass-ceramics with Bi2Sr2CaCu2Ox superconducting phase (2212-phase). The superconducing t ransition exhibits the change in the slope that is characteristic for two d ifferent superconducting phases. It is observed that T-c(zero) increases fr om 20 K to 80 K with increasing time of annealing. The influence of magneti c field on the superconducting transition has been investigated. Our studie s revealed a remarkable broadening of the resistive transition as a functio n of temperature with increasing field. The temperature width (T-c-T) of th e transition for both phases increases with magnetic field according to Tin kham model.