Economic Production of La1−xSrxCrO3 and La1−xSrxMnO3

Abstract

Self-propagating High-temperature Synthesis (SHS) was used to produce complex oxides La1−xSrxCrO3 (with x = 0.1 and 0.2), which are used to manufacture interconnect component, and La0.89Sr0.1MnO3, used as the cathode in solid oxide fuel cells (SOFCs). Thermodynamic predictions and experiments show that these oxides can be prepared via SHS under moderate conditions from the mixture of La2O3 + SrO2 + Cr + CrO3 and La2O3+ SrO2 + Mn + O2, respectively. The oxidation of metallic Cr and Mn was the main source of heat generation, which maintained a stable reaction front. Replacing part of the metallic fuel in the reactant mixture by its oxide modifies the combustion temperature, front propagation velocity and product particle size. The predicted and observed combustion temperatures were in reasonable agreement. SHS enables a more economic production of La1−xSrxMeO3 (Me = Cr, Mn) than existing commercial processes.