Abstract
(1−x)Bi0.5Na0.5TiO3s (solid-state method)–xBi0.5Na0.5TiO3g (sol–gel method)–0.06BaTiO3 (0 ≤ x ≤ 1) ceramics were prepared and the effect of powder synthesis conditions on the physical properties of ceramics was investigated. A morphotropic phase boundary was observed in the Bi0.5Na0.5TiO3–0.06BaTiO3 system. With increasing Bi0.5Na0.5TiO3g content, the maximum value of dielectric constant reduces sharply. The Bi0.5Na0.5TiO3g significantly disrupts the long-range ferroelectric order dominant of the ceramics, which leads to a degradation of the remanent polarization and coercive field. These results may be helpful to further understand and design new Bi0.5Na0.5TiO3-based lead-free piezoelectric ceramics.
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