Abstract
(1−x)(K0.5Na0.5)0.95Li0.05Nb0.93Sb0.07O3−xMZrO3 (M = Ca, Sr, Pb, Ba) ceramics with ABO3 structure were synthesized by conventional solid state reaction route. The effect of different kinds of dopant on orthorhombic–tetragonal (O–T) phase boundary and phase transition temperature were investigated, and the tolerance factor (t) of four kinds of zirconate dopants effect on piezoelectric properties was evaluated at O–T phase boundary. A quantitative relationship between O–T phase boundary and t was developed, the excellent piezoelectric properties was obtained when the t value at the O–T phase boundary in KNN-based lead free ceramics was around 0.9965–0.9990.
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