In this book, the authors present current research in the study of the crystallography, chemistry and catalytic performance of perovskites. Topics discussed include the defect structure and defect-induced expansion of perovskite oxides, perovskite-based catalysts for transformation of natural gas and oxygenates into syngas, Bi containing multiferroic perovskite oxide thin films, perovskites as catalysts for environmental remediation, microwave-assisted synthesis and characterisation of perovskite oxides, perovskite and lead based ceramic materials, photocatalytic properties of perovskite-type layered oxides, structure of perovskite electron-ionic conductors, and distorted perovskites.