Abstract
The composition around Bi2CuO4 in the Bi2O3-CuO system was studied using DTA and X-ray analysis. Only the compound Bi2CuO4 was confirmed in the Bi2O3-CuO system as reported previously. The eutectic temperature was observed between 750°C to 760°C, which is 10°C to 20°C lower than the value previously reported. The monoclinic (α-form) to cubic (δ-form) transition of Bi2O3 was observed at 730°C, which is in good agreement with the previous studies.
The interesting crystallization of γ-Bi2O3 was observed in the narrow composition range about 60-50 mol % Bi2O3 when it was quenched above 760°C in air. However, α-Bi2O3 was observed in the more Bi2O3 rich composition at 70 mol % B1203.
