Nominal(Li0.5Ce0.5) x(Na0.5Bi0.5)(1-x) Na0.5Bi4.5Ti5O18 composite ceramics were fabricated using conventional solid-state reaction method. The coexistence of bismuth layer-structured phase and perovskite phase was determined in these ceramics using XRD technique. At room temperature,the x=0.11 sample showed the largest piezoelectric constant,d33,of about 26.5 pC/N and the largest electromechanical coupling factor,kt,of about 30%. Even after annealing at 500 °C,the value of d33 was still about 19 pC/N,in x=0.08-0.11 samples. Moreover,these composite ceramics showed low temperature coefficients of dielectric constant and high electrical resistivity in the temperature region of 450-550 °C. These results indicated that(Li,Ce) modified NaBi5Ti5O18 composite ceramics were promising piezoelectric materials for high-temperature applications.
