Abstract
The crystal structure, microstructure, dielectric and ferroelectric properties of (1 − x)Na 0.5Bi 0.5TiO 3– xBaTiO 3 ceramics with x = 0, 0.03, 0.05, 0.07 and 0.1 are investigated. A structural variation according to the system composition was investigated by X-ray diffraction (XRD) analyses. The results revealed that the synthesis temperature for pure perovskite phase powder prepared by the present sol–gel process is much lower (800 °C), and a rhombohedral–tetragonal morphotropic phase boundary (MPB) is found for x = 0.07 composition which showing the highest remanent polarization value and the smallest coercive field. The optimum dielectric and piezoelectric properties were found with the 0.93Na 0.5Bi 0.5TiO 3–0.07BaTiO 3 composition. The piezoelectric constant d 33 is 120 pC/N and good polarization behaviour was observed with remanent polarization ( P r) of 12.18 pC/cm 2, coercive field ( E c) of 2.11 kV/mm, and enhanced dielectric properties ɛ r > 1500 at room temperature. The 0.93Na 0.5Bi 0.5TiO 3–0.07BaTiO 3-based ceramic is a promising lead-free piezoelectric candidate for applications in different devices.
Published Version
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