Abstract
Lead-free (1 − x)Na0.5Bi0.5TiO3-xSrTiO3 (NBT-STx; x = 0.05, 0.10, 0.15 and 0.20) ceramics were prepared using a high-temperature solid-state reaction method. X-ray diffraction patterns indicated that the ceramics were a cubic structure with space group $$Pm\overline {3} m$$ at room temperature. The average grain sizes slightly decreased with the increasing SrTiO3 content observed by scanning electron microscope. The dielectric properties and complex impedance spectra were used to analyze the electrical behavior of the ceramics as a function of frequency at different temperature. The results showed that with the increase of x, the dielectric constant increased, however, the temperature of the dielectric maximum (T m ) and depolarization temperature (Td) decreased. The modified Curie–Weiss law was used to describe the diffuseness behavior of the ceramics. The relaxation activation energy was estimated to be 2.32–2.73 eV through Arrhenius fitting, which indicated that the oxygen vacancy concentration in the samples was low.
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