Microstructure evolution and energy storage properties of potassium strontium niobate boroaluminosilicate glass-ceramics by microwave crystallization

Abstract The potassium strontium niobate boroaluminosilicate (KSN-BAS) glass-ceramics were prepared through microwave sintering. The effects of crystallization time on the microstructure and dielectric properties of the KSN-BAS glass-ceramics were investigated. The XRD results exhibited that an impure phase AlNbO 4 was devitrified from the glass matrix as the crystallization time increased. The microstructure showed that the grain size increased as the crystallization time prolonged. Crystal boundary activation energy of the KSN-BAS glass-ceramics was performed by impedance analysis. The dielectric constant and electric breakdown strength indicated a trend of increasing at first and then reducing with the increase of the crystallization time. When the crystallization time was 10 min, the optimization of dielectric constant of 102.0 and breakdown strength of 1410.81 kV/cm were obtained. The maximum of theoretical energy storage density can reach a value of 8.99 J/cm 3 . For pulsed power applications, the discharge efficiency and power density were evaluated by RLC circuit.