Enhanced energy-storage performance and temperature-stable dielectric properties of (1-x)[(Na0.5Bi0.5)0.95Ba0.05]0.98La0.02TiO3-xK0.5Na0.5NbO3 lead-free ceramics.

Polycrystalline (1- x)[(Na 0.5 Bi 0.5) 0.95 Ba 0.05 ] 0.98 La 0.02 TiO 3 - x K 0.5 Na 0.5 NbO 3 systems were prepared using the solid-state reaction technique. Modification of (Na 0.5 Bi 0.5) 0.95 Ba 0.05 ] 0.98 La 0.02 TiO 3 ceramic with a proper amount of K 0.5 Na 0.5 NbO 3 can effectively improve the temperature-stable of dielectric properties. A variation in dielectric constant is maintained smaller than ±5% from 80 to 300 °C accompanied with a low dielectric loss (≤0.04). The relaxor properties of the doped samples are significantly enhanced. A high energy storage density of 1.1 J/cm3 and efficiency ~80% at 90 kV/cm are achieved in the x = 0.05 composition. Hence, the as-prepared ceramics might be practical in dielectric constant which can work stably at a high temperature range and pulsed capacitors. [ABSTRACT FROM AUTHOR]