Effects of (LiCe) co-substitution on the structural and electrical properties of CaBi2Nb2O9ceramics

The piezoelectric, dielectric, and ferroelectric properties of the (LiCe) co-substituted calcium bismuth niobate (CaBi 2 Nb 2 O 9 , CBNO) are investigated. The piezoelectric properties of CBNO ceramics are significantly enhanced and the dielectric loss tan δ decreased. This makes poling using (LiCe) co-substitution easier. The ceramics (where □ represents A-site Ca 2+ vacancies, possess a pure layered structure phase and no other phases can be found. The Ca 0.88 (LiCe) 0.04 □ 0.04 Bi 2 Nb 2 O 9 ceramics possess optimal piezoelectric properties, with piezoelectric coefficient ( d 33 ) and Curie temperature ( T C ) found to be 13.3 pC/N and 960 °C, respectively. The dielectric and piezoelectric properties of the (LiCe) co-substituted CBNO ceramics exhibit very stable temperature behaviours. This demonstrates that the CBNO ceramics are a promising candidate for ultrahigh temperature applications.