Dielectric and piezoelectric properties of Sb5+ doped (NaBi)0.38(LiCe)0.05[]0.14Bi2Nb2O9 ceramics

Sb5+-doped (NaBi)0.38(LiCe)0.05[]0.14Bi2Nb2O9 (represented as NBNLCS-x, where [] represents A-site vacancies) ceramics were prepared by the conventional solid-state route. The ceramics well sintered to approach ∼98.5% theoretical density and the tetragonality of crystal structure increased with Sb5+ additions. However, the Curie temperature (TC) and the piezoelectric coefficient (d33) of Sb5+-modified ceramics gradually decreased. The 3 mol% Sb5+-doped samples exhibited optimum properties with a d33 value of ∼22 pC/N planar electromechanical coupling factor (kp) of ∼11.2% and relatively high TC of ∼765 °C. These results indicate that NBNLCS-x material is a promising candidate for high-temperature piezoelectric applications.

► Li, Ce, Sb–Na0.5Bi2.5Nb2O9 ceramics prepared by conventional sintering method. ► The crystal structure symmetry changed by Sb5+ doped. ► The dielectric, piezoelectric properties and thermal stability exhibited good performances.