Abstract
(1−x)(K0.5Na0.5)NbO3-xBi0.5(Na0.9K0.1)0.5TiO3 ((1−x)KNN-xBNKT) lead-free ceramics were prepared by the conventional solid state reaction technique, and the effects of BNKT on the phase structure, microstructure, ferroelectric and piezoelectric properties of (1−x)KNN-xBNKT ceramics were investigated. The addition of BNKT strongly affects the microstructure of these ceramics, and changes the crystalline structure of these ceramics from an orthorhombic phase with x < 0.02 to a tetragonal phase with x ≥ 0.03 at room temperature. A coexistence of orthorhombic and tetragonal phases was identified in the range of 0.02 ≤ x < 0.03. 0.975KNN-0.025BNKT ceramics show the optimum piezoelectric properties of d 33∼170 pC/N and k p∼0.38.
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