Effects of Sintering Time on Structure and Properties of 0.997(KNN-LS-BF)-0.003V<sub>2</sub>O<sub>5</sub> Lead-Free Piezoelectric Ceramics

Abstract

0.997(KNN-LS-BF)-0.003V2O5 piezoelectric ceramics were prepared by the traditional sintering method. The effects of sintering time on structure and properties of 0.997(KNN-LS-BF)-0.003V2O5 ceramics were studied. With the increase of sintering time from 2h to 6h, the crystal phase changes from orthorhombic symmetry phase to tetragonal phase, and the properties in the piezoelectric constant d33, planar coupling coefficient kp, dielectric constant εr and dielectric loss tanδ all have been remarkably improved when the sintering time increase to 4h, then the properties of the samples would be deteriorated when the sintering time is over 4h. However, the mechanical quality factor Qm would be deteriorated all along with the increase of sintering time.