Bi4Sr3Ca3 Cu4O16 glass and superconducting glass ceramics

Abstract

A ${\mathrm{Bi}}_4$ ${\mathrm{Sr}}_3$ ${\mathrm{Ca}}_3$ ${\mathrm{Cu}}_4$ ${\mathrm{O}}_{16}$ glass has been successfully fabricated by the melting process. Glass transition temperature, crystallization temperature, and liquid temperature of the glass are 434, 478, and 833°C, respectively. After the glass is heat treated at 800°C, a glass ceramic is formed. A comparison of the x-ray-diffraction pattern of the superconducting ${\mathrm{Bi}}_4{\mathrm{Sr}}_3{\mathrm{Ca}}_3{\mathrm{Cu}}_4{\mathrm{O}}_{16+x}$ ceramic to the ${\mathrm{Bi}}_4$ ${\mathrm{Sr}}_3$ ${\mathrm{Ca}}_3$ ${\mathrm{Cu}}_4$ ${\mathrm{O}}_{16}$ glass ceramic revealed preferred orientation in the glass-ceramic crystals. The superconducting transition temperatures $T_{c\left(\mathrm{onset}\right)}$ and $T_{c\left(\mathrm{zero}\right)}$ of the glass ceramics are 100 and 45 K, respectively.