On the Enhancement of Energy Storage Performance in Modified Relaxor Ferroelectric Ceramics for Pulsed Power Applications

Relaxor-type ferroelectrics show important potential in energy storage fields due to their significantly enhanced energy performance and good temperature stability compared to normal ferroelectrics. Here, a novel, high-performance ternary composition, (0.4-x)BiFeO3-xBi(Mg1/2Ti1/2)O-3-0.6BaTiO(3) (x = 0.2, 0.25, 0.3, 0.35, 0.4), was designed by compositional modulation, which displays typical relaxor characteristics. The optimum energy storage properties can be attained at x = 0.35, accompanied by energy efficiency of 84.87%, a promising energy storage density of 2.3 J/cm(3) and good temperature stability of less than 10% over 20-160 degrees C. Moreover, the samples provide stable cycling fatigue after 10(5) cycles and a fast discharge time of t(0.9) < 0.1 mu s, indicative of promising applications in energy units.