Piezoelectric properties and thermal stability of Ca(Li,Ce)BiNbWO high-temperature ceramics.

Ca(Li,Ce)BiNbWO ( x = 0.01-0.06) high-temperature piezoceramics were prepared by a conventional solid-state sintered method, and effects of W content on their piezoelectric properties were studied. All samples possess a pure Aurivillius-type structure, showing that Li, Ce, and W dopants have well diffused into the CaBiNbO lattice to form a solid solution. The doping with W slightly decreases the Curie temperature ( T) of the ceramics. In addition, the excellent electrical properties (e.g., d ~ 16.1 pC/N, k ~ 9.58 %, Q ~ 4,767) and a high Curie temperature (e.g., T ~ 925 °C) are simultaneously obtained in the ceramics with x = 0.04, together with an enhanced thermal stability of <900 °C. As a result, the investigated material system provides the promising potential applications in ultra-high-temperature environments. [ABSTRACT FROM AUTHOR]