Pseudo-relaxor behavior in Na1/2Bi1/2Cu3Ti4O12 ceramics

High temperature dielectric behaviors have been explored in Na1/2Bi1/2Cu3Ti4O12 ceramics. The broad dielectric peaks could be fine fitted by the modified Curie–Weiss law and the Vogel–Fulcher relationship. Based on the universal dielectric response law and Maxwell–Wagner relaxation, the occurrence of the polarization mechanism transition from the grain boundary response to the electrode one with temperature is clearly evidenced in the low frequency range. It is likely to propose that the apparent relaxor-like behavior is related to an extrinsic effect instead of ferroelectricity.