Structure and electrical properties of SrBi2Nb2O9-based ferroelectric ceramics with lithium and cerium modification

Aurivillius-type ceramics, Sr0.6(BiNa)0.2Bi2Nb2O9(SBNBN) with lithium and cerium modification, were synthesized by using conventional solid-state processing. X-ray diffraction analyses (XRD) and Raman spectroscopy revealed that the lithium and cerium modified SBNBN ceramics had a single phase with perovskite-type orthorhombic structure. The effect of lithium and cerium substitution for A site on structure and electric properties of the SBNBN-based ceramics was investigated. Piezoelectric properties of the SBNBN ceramics were significantly improved by the modification of lithium and cerium. Curie temperature Tc and piezoelectric coefficient d33 of the Sr0.5(BiNa)0.2(LiCe)0.05Bi2Nb2O9 ceramics were 583 °C and 28 pC/N, respectively. Reasons for enhancement in piezoelectric properties of the SBNBN ceramics were discussed.