Subsolidus equilibria in air in the La2O3 -CeO2-Co2O3 system were studied w
ith the aim to obtain information on possible interactions between LaCoO3-b
ased cathode and CeO2-based solid electrolyte in solid oxide fuel cells (SO
FC). No ternary compound was found. The tie line is between LaCoO3 and CeO2
.