Subsolidus phase equilibria in the RuO2–Bi2O3–ZrO2 system

Subsolidus equilibria in air in the RuO2–Bi2O3–ZrO2 system were studied with the aim of obtaining information on possible interactions between a Bi2Ru2O7-based cathode and a ZrO2-based solid electrolyte in solid-oxide fuel cells (SOFCs). No ternary compound was found in the system. The tie lines are between Bi2Ru2O7 and ZrO2, and between Bi2Ru2O7 and gamma-Bi2O3—the ZrO2 stabilised Bi2O3 phase, stable at temperatures over 710 °C.