Abstract
Lead-free piezoceramics (K0.5N0.5)NbO3-x wt% Bi4Ti3O12 were fabricated, and effects of Bi4Ti3O12 on the properties of (K0.5N0.5)NbO3 ceramics were investigated. The results show that the orthorhombic and tetragonal transition temperature of the ceramics shifts toward room temperature and a small amount of Bi4Ti3O12 cannot influence the symmetry of (K0.5N0.5)NbO3 ceramics but improve their electrical properties. Optimum piezoelectric properties are owned by (K0.5N0.5)NbO3–0.50 wt% Bi4Ti3O12: d 33 = 135 pC/N, k p = 36.4%, and T C = 406°C, whereas the relatively superb ferroelectric properties are obtained by (K0.5N0.5)NbO3–0.75 wt% Bi4Ti3O12: P r = 27.2 μC/cm2, E c = 7.6 kV/cm, and T C = 398°C.
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