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

• Relaxor-like behaviors have been explored in Na1/2Bi1/2Cu3Ti4O12 ceramics.
• The high temperature relaxor-like behaviors are attributed to an extrinsic effect.
• Increasing temperature induces a gradual polarization mechanism transition.

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.

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