Effect of NaNbO3 addition on structure, dielectric and energy storage properties of lead free piezoelectric Bi0.5Na0.5TiO3-K0.5Na0.5NbO3 ceramics

NaNbO3 modified Bi0.5Na0.5TiO3-K0.5Na0.5NbO3 ceramics are prepared as per the nominal formula (1-x) 0.93Bi(0.5)Na(0.5)TiO(3)-0.07K(0.5)Na(0.5)NbO(3)]-xNaNbO(3) (1-x)(0.93BNT-0.07KNN)-xNN; 0 <= x <= 0.16] using conventional solid state synthesis route. Detailed analysis of the compositions indicate decrease in the polarization, increase in the energy storage property and flattening in the temperature dependent dielectric permittivity with increasing NaNbO3 (NN) concentration. Structural study confirms the increasing tendency of cubic like phase formation with increasing NN concentration. Our results suggest that among other factors, cubic like phase formation at room temperature is the responsible factor for the observed trends in various properties. Flattening in the temperature dependent dielectric permittivity indicates that the prepared ceramics are suitable for capacitor applications