Thermodynamic Evaluation of the Bi-Cu-O System

A thermodynamic evaluation of the ternary Bi-Cu-O system has been made and a set of parameters consistently describing the system at 1 bar total pressure has been determined. The ternary system contains a liquid phase which is continuous at high temperature and separates into a metal liquid and an oxide liquid at low temperature and the ternary compound Bi₂CuO₄ in addition to the binary compounds. Concentration/temperature diagrams are given for the Bi₂O₃-CuO _x system at oxygen partial pressures of 1, 0.21 and 10⁻⁵ bar, as well as a potential diagram. Selected isothermal sections at 1100 and 1473 K are also presented. Available experimental data are rather limited and often show a relatively large scatter, but nevertheless make it possible to determine a sufficient set of thermodynamic parameters.