Effect of Firing Conditions on Phase Formation, Microstructure and Dielectric Properties of KNN-LS-BN Ceramics Fabricated by Combustion Technique

Abstract

The 0.998[0.95(K0.5Na0.5NbO3–0.05LiSbO3)]-0.002BiNiO3; KNN-LS-BN ceramics has been prepared by the combustion technique using glycine as a fuel. A pure orthorhombic phase was obtained in the powder calcined at 750°C for 0.5 h. For the sintered pellets, a pure tetragonal structure was found in the ceramic sintered at 1100°C for 1–3 h using heating and cooling rate of 15°C/min. The average grain size and linear shrinkage were increased with the increasing of dwell time. The highest density, maximum dielectric constant and lowest dielectric loss at Tc with a value of 98.4%, 4872 and 0.1 were found in the sample sintered at 1100°C for 2 h using heating and cooling rate of 15°C/min.