Abstract
0.75(Na0.5Bi0.5)TiO3–0.25SrTiO3–xNb2O5 (labeled as NBT–ST–xNb, x=0.00, 0.01, 0.02, 0.03) ceramics were prepared by a solid-state reaction method. The crystal structure and grain morphology were characterized. Dielectric constant (εr) and dielectric loss tangent (tanδ) could be observed in the dielectric spectroscopy and the modified Curie-Weiss law was used to analyze the relaxation behavior. According to the impedance spectroscopy, we used the equivalent circuit model to fit the impedance results. To better understand the relaxor behavior, the electric modulus was analyzed and indicated that there was a conduction process of charge carriers from long-range mobility to short-range mobility. The relaxation activation energy (Ea) and conductance activation energy (Ec) confirmed the oxygen vacancies (OVs) also played a significant role in the conduction process.
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