Piezoelectric and electromechanical properties of ultrahigh temperature CaBi2Nb2O9 ceramics

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 delta decreased by (KCe) substitution. The Ca-0.9(KCe)(0.05)Bi2Nb2O9 ceramics possess the optimal piezo-electric properties, and the peizoelectric coefficient (d(33)), Curie temperature (T-c), and electromechanical coupling factors (k(p) and k(t)) were found to be 16 pC/N , 868 degrees 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. (C) 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim