Oxygen nonstoichiometry of B-site doped LaCrO3
Abstract Recently, B-site doping in the perovskite-type oxides has often been carried out to control various properties. One of the perovskite-type oxides, doped LaCrO 3 , is the candidate for the interconnector for Solid Oxide Fuel Cells (SOFC). For its stability under reducing atmospheres, B-site doped LaCrO 3 is also one of the candidates for the anode of SOFC. The oxygen nonstoichiometry, δ , in B-site doped LaCrO 3- δ was measured as a function of oxygen partial pressure at 973 K to 1373 K. The observed values of δ were different by the different B-site dopants, and also different from those of A-site doped LaCrO 3 . It was shown that only 10 mol% of dopant in B-site drastically affects the redox property of LaCrO 3 . Defect model for B-site controlled LaCrO 3 was interpreted by assuming the reaction, 2Cr Cr X  + V O ••  + 1/2O 2 (g)⇔2Cr Cr •  + O O X .