Abstract
A series of piezoelectric ceramics with the formula (1−x)Ca0.92(LiCe)0.04Bi2Nb2O9 + xCa2Nb2O7 (CBNLC–CNO-x, where x = 0, 0.05, 0.1, 0.15, 0.2) were prepared by a facile traditional solid-state reaction method. The phase structure, Raman spectra, microstructure, dielectric properties, electric properties, piezoelectric properties and thermal stabilities of the obtained CBNLC–CNO-x ceramics were studied. X-ray diffraction revealed that the obtained ceramics had a typical bismuth layer structure with secondary phases of Ca2Nb2O7. The Rietveld refinement and Raman spectra revealed a lattice distortion in the CBNLC–CNO-x ceramics, which influenced the piezoelectric properties. Scanning electron microscopy indicated that the grain size of the ceramics gradually decreased with increasing x value. The Curie temperature (Tc) of the ceramics was retained at an elevated temperature of approximately 926–940 °C and was close to that of pure CBN. The obtained ceramics showed great thermal stabilities, relative densities, dielectric properties and piezoelectric properties, which are beneficial for high-temperature applications.
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