THERMODYNAMIC STABILITY OF PHASES IN THE BI-SR-CU-(O) SYSTEM

An effort for a better understanding of the phase formation and their stability in the ternary system Bi2O3-SrO-CuO led to investigations of the phase equilibria, particularly in the sub-solidus region. To exte nd this phase region about the respective solid-liquid equilibria the isothermal and pseudobinary cuts of the BiO1.5-SrO-CuO ternary system in the temperature range from 810 to 850 degrees C were determined. A particular attention was also devoted to the thermodynamic stability o f the Bi2+xSr2-yCuO6+delta phase.