Abstract
Abstract (1 − x )[(K 0.4725 Na 0.4725 )Li 0.055 ]NbO 3 – x AgSbO 3 [(1 − x )KNNL– x AS] lead-free piezoelectric ceramics were prepared by the conventional mixed oxide method. Effect of the amount of AgSbO 3 (AS) on the phase structure, microstructure, ferroelectric and piezoelectric properties of (1 − x )KNNL– x AS ceramics were systematically investigated. It was found that the AS content in (1 − x )KNNL– x AS ceramics strongly affects the structure and electrical properties. A morphotropic phase boundary (MPB) between orthorhombic and tetragonal phases was identified in the composition range of 0.01 x x )KNNL– x AS ( x = 0.02) ceramics exhibit enhanced electrical properties ( d 33 ∼ 230 pC/N, T c ∼ 430 °C, k p ∼ 39%, P r ∼ 40.3 μC/cm 2 and E c ∼ 12.3 kV/cm) for the formation of MPB. These results show that (1 − x )KNNL– x AS ceramics are promising candidates for lead-free piezoelectric materials.
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