Dielectric and Ferroelectric Properties of Ag Modified Lead Free 0.94[KNN]–0.06[LS] Ceramics

Abstract

Lead-free 0.94[(K_0.5Na_0.5)_0.98Ag_0.02NbO₃]-0.06(LiSbO₃) (KNAN-LS) ferroelectric ceramics, (a morphotropic phase boundary (MPB) composition), was synthesized by both conventional mixed-oxide and microwave processing techniques. The KNAN-LS system was calcined at 850° for 6 h for the formation of single perovskite phase where as the conventional and microwave sintering was done at 1080°C for 4 h and 1050°C for 1 h, respectively. SEM characterization of the microwave sintered ceramics revealed dense and homogeneous packing of grains. The microwave sintered KNAN-LS samples showed better dielectric and ferroelectric properties compared to conventional sintering route.

Keywords:

• Perovskites
• Dielectric properties
• Ferroelectric Properties
• Microwave Sintering