Abstract
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 ~16.1pC/N.The Curie temperature of all the samples were in the range of 925–941°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°C, ~106Ωcm; 600°C, ~105Ω·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.
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