Abstract: In order to further explore the effect of synthesis process on structure and dielectric properties of the sodium bismuth titanate lead-free materials, thus, taking glycine as fuel, cerium-doped Bi0.5Na0.5TiO3-Bi0.5K0.5TiO3 (BNKT) ceramics were prepared by the solid-combustion composite method.X-ray diffraction (XRD) data shows that the calcined temperature, combining the combustion method in solid phase synthesis process, declined by 150 ℃ than that of conventional solid state method and CeO2 diffused into the lattice of BNKT ceramics, as well as the pure perovskite phase was formed while the amount of CeO2 was 0%-0.3%.SEM images indicate that the doping of CeO2 made grain crystal size uniform and restrained crystal grain growth.The temperature dependence of the dielectric constant and dissipation factor shows that the dielectric constant εr, depolarization temperature Td and the inversion temperature Tm of the antiferroelectric to ferroelectric phase decreased with addition of CeO2, and also the dielectric peak was weakened gradually and the dielectric loss tanδ is below 0.3% between room temperature and 300 ℃.Furthermore, combining microstructural vacancy mechanism with ferroelectric domain wall movement, the law of function is discussed and analyzed.

Key words: BNKT;CeO2-doping;solid-combustion composite method;structure;dielectric property