Abstract
High-performance thin piezoelectric ceramic sheets are crucial for improving the properties of stacked actuators. However, few studies have been conducted on the preparation of thin sheets of KNN-based lead-free ceramics. In this study, 0.9625(K0.48Na0.52) (Nb0.6Sb0.4)O3-0.0375Bi0.5(Na0.82K0.18)0.5ZrO3 (KNNS-BNKZ) ceramics were prepared by a traditional solid-state reaction method and then ground to thicknesses of 0.5, 0.4, and 0.3 mm. X-ray diffraction patterns, scanning electron microscope images, temperature-dependent dielectric constants, and the piezoelectric constants d33 were measured. In addition the hysteresis loops and butterfly strain curves were recorded. The results show that the phase of the ceramics changed from tetragonal to orthorhombic during the grinding process because of grinding stress, and the piezoelectric properties of the ceramics (i.e., d33) increased from 198 to 275 PC/N. More importantly, Pr increased, Ec decreased, and a high strain of 0.125% was achieved under an electric field of 14 kV/cm for the 0.5-mm-thick ceramic with d33 = 268 PC/N. It is concluded that grinding not only can reduce the thicknesses of ceramic sheets but can also improve their electromechanical properties, which opens up a new path for employing KNN-based ceramics in piezoelectric stack actuators.
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