Two-dimensionality of the properties of a volumetric object may be defined by its anisotropy. Perovskite-like compounds of the family of Aurivillius–Smolensky phases (ASPs) have exactly this property. By studying perovskite-like compounds of the family of Aurivillius–Smolensky phases and the changes in the volume of the crystal lattice,occurring in them,namely the increase or decrease in the phase transition temperature (Curie temperature),the preferred direction of grain growth with an increase in the sintering temperature and,as a consequence,the increase in the relative permittivity,the main factor in all cases is the change in the linear parameters a and b,lying in the plane perpendicular to the c-axis.