Improved energy-storage properties accompanied by reduced interfacial polarization in linear Ca0.5Sr0.5TiO3 ceramic
Xuqing Zhang, Yongping Pu, Yating Ning, Lei Zhang, Yangchao Shang, Bo Wang, Zhemin Chen
Abstract
In this study, (1- x )Ca 0.5 Sr 0.5 TiO 3 - x SmNbO 4 ceramics were synthesized using the solid-phase reaction method at 1400 °C. The addition of SmNbO 4 led to significant improvements in breakdown strength (510 kV/cm) and energy storage performance (5.43 J/cm 3 and 95.1%), which is the best among linear dielectrics at present. The effects of SmNbO 4 on charge transport and interfacial polarization behavior were investigated. Furthermore, ceramics capacitor exhibits an excellent power density of 36.7 MW/cm 3 in an ultrafast discharge time of 29 ns at 140 kV/cm. Meanwhile, x = 0.005 ceramics exhibited good temperature (20 °C–170 °C) and frequency stability (1 Hz–100 Hz).