Physicochemical and Catalytic Properties of La1 – xCaxFeO3 – 0.5x Perovskites Prepared Using Mechanochemical Activation

摘要: The phase composition of La1 – xCaxFeO3 0.5x perovskites synthesized from preactivated oxides was studied by powder X-ray diffraction analysis and differential dissolution. system does not form a continuous series homogeneous solid solutions. No intermediate samples this are monophasic. It found that the synthesis under nonequilibrium conditions (mechanical activation + calcination at 900°С for 4 h) resulted in microheterogeneous solutions with degrees calcium substitution lanthanum no higher than 0.5. A longer (for 16 or an increase temperature up to 1100 °С decreased content down x ∼ 0.2 because formation brownmillerite phase. catalytic activity test oxidation CO changed nonmonotonically x, it maximum = 0.5–0.6, which correlates density interphase boundaries these samples.