Piezoelectric and electromechanical properties of ultrahigh temperature CaBi₂Nb₂O₉ ceramics

Abstract The piezoelectric, dielectric, and electromechanical properties of the (KCe) co‐substituted calcium bismuth niobate (CaBi₂Nb₂O₉, CBN) were investigated. The piezoelectric activities of CBN ceramics were significantly enhanced and the dielectric loss tan δ decreased by (KCe) substitution. The Ca_0.9(KCe)_0.05Bi₂Nb₂O₉ ceramics possess the optimal piezoelectric properties, and the piezoelectric coefficient (d₃₃), Curie temperature (T_C), and electromechanical coupling factors (k_p and k_t) were found to be 16 pC/N, 868 °C, 8.6%, and 23.8%, respectively. The excellent dielectric and electromechanical spectra, together with the high piezoelectric activities and ultrahigh Curie temperature, make CBN ceramics promising candidates for high temperature piezoelectric applications. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)