Effects of (Li, Ce, Y) co-substitution on the properties of CaBi2Nb2O9 high temperature piezoceramics

High temperature lead-free Bismuth layer-structured (Li, Ce, Y)-substituted CBN piezoelectric ceramics were prepared by the solid-state reaction method. The phase structure, microstructure, piezoelectric property, dielectric property, thermal stability and electric property of the (Li, Ce, Y)-substituted CBN ceramics were studied. X-ray diffraction and SEM revealed the doped ceramics had typical bismuth layer-structure. The piezoelectric coefficient was improved significantly and the maximum value was similar to 16.1 pC/N.The Curie temperature of all the samples were in the range of 925-941 degrees C that was close to or even excess the value of pure CBN ceramics. The resistivity were studied deeply and all the samples possessed excellent resistivity at high temperature (500 degrees C, similar to 10(6) Omega cm; 600 degrees C, similar to 10(5) Omega cm). The thermal depoling behavior of the ceramics was researched in detail and the doped ceramics exhibited outstanding thermal stability. All the results indicate the (Li, Ce, Y)-substituted CBN ceramics possesses preeminent property, making it promising for application especially in high temperature territories.