Effect of W/Cr co-doping on electrical properties of Ca0.94Ce0.06Bi4Ti4O15 high-temperature piezoceramics
摘要
Ca0.94Ce0.06Bi4Ti4-x(W1/3Cr2/3)xO15 (CCBT-WCx, x = 0.00–0.10) ceramics were prepared by a solid-state sintering method, and the effect of W/Cr co-doping on the structure and electrical properties of the ceramics was systematically investigated. An enhanced piezoelectric constant d33 (22.1 pC/N) was achieved at the optimized composition with x = 0.04, which increased by 35% as compared to that of pure CCBT ceramics due to more effective distortion of the titanium-oxygen octahedron induced by W/Cr co-doping. Moreover, after annealing at 500 °C, the d33 (21.0 pC/N) of CCBT-WC0.04 ceramics still remained 95% of its initial value, exhibiting excellent annealing thermal stability. In addition to a high Curie temperature (TC = 768 °C), this ceramic should be very promising for high-temperature sensor applications.