INFLUENCE OF CaF 2 –4LiF ADDITIVE ON SINTERING AND ENERGY STORAGE PERFORMANCE OF SrTiO 3 CERAMICS

The CaF 2 –4LiF additive was added into SrTiO 3 ceramics in order to decrease the sintering temperature for compact pulse power application. The crystalline structure, microstructure and energy storage performance of sintered ceramics were studied. Incorporating CaF 2 –4LiF additive to SrTiO 3 ceramics contributes to a notably enhancement of the energy storage density. The great enhancement in energy storage density occurred due to the notable increase in breakdown strength and the refinement of microstructure. With 2 at% additive, the samples exhibited an average breakdown strength of 31.8 kV/mm, and an energy storage density of 1.212 J/cm 3 which is about 1.4 times higher than pure SrTiO 3 .