High performance Aurivillius phase sodium-potassium bismuth titanate lead-free piezoelectric ceramics with lithium and cerium modification

摘要

The piezoelectric properties of the lithium and cerium modified A-site vacancies sodium-potassium bismuth titanate (NKBT) lead-free piezoceramics are investigated. The piezoelectric activity of NKBT ceramics is significantly improved by the modification of lithium and cerium. The Curie temperature T_C, piezoelectric coefficient d_(33), and mechanical quality factor Q_m for the NKBT ceramics modified with 0.10 mol % (LiCe) are found to be 660℃, 25 pC/N, and 3135, respectively. The Curie temperature gradually decreases from 675 to 650℃ with the increase of (LiCe) modification. The dielectric spectroscopy shows that all the samples possess stable piezoelectric properties, demonstrating that the (LiCe) modified NKBT-based ceramics are the promising candidates for high temperature applications.