(Na0.475K0.475Li0.05)(Nb0.92Ta0.05Sb0.03)O3 lead-free ceramics with addition of CeO2

Abstract

Lead-free piezoelectric ceramics (Na_0.475K_0.475Li_0.05)(Nb_0.92Ta_0.05Sb_0.03)O₃ added with different amounts of CeO₂ have been prepared by a conventional mixed-oxide method. After the addition of CeO₂, the sintering performance of the ceramics is greatly improved. The ceramics can be well-sintered at a higher temperature, and hence have a higher density and better piezoelectric and dielectric properties. For the ceramic added with 0.4 wt% CeO₂, the piezoelectric and dielectric properties become optimum, giving d₃₃=246 pC/N, k_p=0.50, epsiv_r=1300 and tandelta=4%.