Physicochemical and catalytic properties of La1-xCaxFeO3-0.5x perovskites

The phase analysis of La1-xCaxFeO3-0.5x perovskites prepared by a ceramic p rocess from oxides is studied by X-ray diffraction and differential dissolu tion methods. At x < 0.5, the system does not form a continuous series of h omogeneous solid solutions and does not consist of the members of a homolog ical series. At x < 0.5, the system contains two phases and calcium ferrite nanoparticles located on the surface of lanthanum ferrite. At x > 0.5, the formation of the structures of a brownmillerite-based homological series i s found. The catalytic activity of perovskites depends nonmonotonically on the x value and reaches the maximum at x = 0.6.