Some mixed metal oxides of perovskite structure

X-ray structural studies, mainly by powder techniques, have been made of a number of ABO3-type mixed oxides. A cubic form of deformed perovskite structure, with eight formula units per cell, has been found in BaThO3, SrSnO3, and SrZrO 3. BaCeO.3 and BaSnO z have the ideal perovskite structure; orthorhombic distortions of this structure occur in SrCeOa and CaSnO3, and rhombohedral distortions in KIO 3 and TIIO 3. Doubt is cast on the identification of a number of 'perovskites' reported previously. Structure changes with composition in several series of perovskite solid solutions are described.