Abstract
The lead free Bi0.5Na0.5TiO3 (BNT) ceramics were synthesized by using a solid state reaction method. The effect of sintering temperature on structure and dielectric properties of BNT ceramics studied systematically. It was observed that the samples calcined at 800 °C and sintered at 1100 °C shown the maximum density (5.67 g/cm3), with larger crystallite size (52 nm), high dielectric constant (er = 694 at 1 kHz), and low dielectric loss (tanδ = 0.103). The XRD pattern reveals that rhombohedral phase with R3c space group at room temperature. The temperature dependent er and tanδ displayed the two phase transitions including ferroelectric to anti-ferroelectric low phase transition (198 °C) and anti-ferroelectric to para electric phase transition (330 °C). The high frequency dielectric analysis revealed that weak relaxor behaviour presented in the system.
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