High dielectric permittivity of BiFeO3–SrTiO3–CaTiO3 ternary solid solution ceramics

Abstract

xCaTiO3-(0.8-x)SrTiO3-0.2BiFeO3 (x = 0, 0.3, 0.5, 0.7) ternary solid solution ceramics were prepared by a conventional high temperature sintering method. The structural and electrical properties of these ceramics were studied comprehensively. 0.3CaTiO3-0.5SrTiO3-0.2BiFeO3 ceramics show large dielectric permittivity and small variation over a broad temperature range, making it a potential candidate for high-temperature electronic applications. The origin of the large dielectric permittivity is discussed based on the contributions of both A-site and B-site cations on the polarizability of the system. The multiple cations induced local structural heterogeneity and/or random field is proposed as the reason for the thermal stability of dielectric permittivity.