PREPARATION OF BI-PB-SR-CA-CU-O SUPERCONDUCTORS BY THE SPRAY PYROLYSIS METHOD USING ULTRASONIC ATOMIZATION TECHNIQUES

The high Tc oxide superconductor of the BiPbSrCaCuO system was prepared by spray pyrolysis. X-ray diffraction patterns of the sample show a perfectly isolated 110 K phase. Superconducting transition with zero-resistance temperature at Tc = 101 K was achieved for a sample calcined at 850°C for 18 hr and sintered at the same temperature for 12 hr. The heat treatment time required to form the pure 110 K phase could be minimized by spray pyrolysis. The critical current density at 77 K in zero magnetic field was 528 A/cm2. © 1990.