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Thermal Stability of the High-Tc Superconductor in the Bi-Sr-Ca-Cu-O System

In order to examine the thermal stability of the high-Tc phase (Tc∼110 K) in the superconducting Bi-Sr-Ca-Cu-O system, thermal analyses under various oxygen partial pressures were made at a temperature range of 800 to 900°C. The high-Tc phase disappeared under oxygen partial pressures of 0.02 and 0.1 atm at 870°C and under higher oxygen partial pressures than 0.2 atm at a temperature range of 880 to 900°C. Under oxygen partial pressures higher than 0.2 atm at 870°C, the amount of the high-Tc phase was markedly increased from the possible disproportionation reaction of the low-Tc phase (Tc∼80 K).