Some studies of lead free KNN LN ceramics

Abstract

Investigations in the development of lead-free (1 − x)(K0.5Na0.5)NbO3-xLiNbO3 piezoelectric ceramics have recently claimed comparable properties to the lead-based ferroelectric perovskites. The intrinsic nature of the dielectric and piezoelectric properties are discussed in relation to Curie temperature and morphotropic phase boundary (MPB) nature. To know the effect of LiNbO3 substitution, lead-free (1 − x)(K0.5Na0.5)NbO3-xLiNbO3 (KNN:LN) ceramics were prepared by the solid-state reaction route. The crystallized phase and grain morphology of the KNN:LN ceramics were confirmed by X-ray diffraction and SEM studies, respectively. The dielectric and electrical properties were investigated as a function of the frequency and the temperature. Appearance of well saturated P-E loop confirms the ferroelectric nature of KNN-LN . The effect of LiNbO3 substitution on crystallized phase, grain morphology, ferroelectric and electrical properties are discussed