Abstract
Lead-free ceramics (1−x)NaNbO3–xBa0.6(Bi0.5K0.5)0.4TiO3+1mol% MnO2 were prepared by an ordinary sintering method and their structure, dielectric and piezoelectric properties were studied. All the ceramics possess a pure perovskite structure. The ceramics have an orthorhombic symmetry at x≤0.05 and transform gradually to a tetragonal structure with x increasing. A morphotropic phase boundary is formed at 0.05<x<0.125. A small amount of Ba0.6(Bi0.5K0.5)0.4TiO3 (x≥0.025) transforms NaNbO3 from antiferroelectric to ferroelectric and strong ferroelectricity is observed in the ceramics with x=0.05–0.175. The ferroelectric–paraelectric phase transition becomes diffusive with x increasing. High mechanical quality factor Qm values of 1211–1862 are obtained at x=0.05–0.075. Due to the MPB and the weakened stability of ferroelectric domain induced by the decrease in the TC, the ceramics with x=0.10–0.175 exhibit the optimum piezoelectric properties, giving d33=105–131pC/N and kp=20.8–26.5%.
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