Improved energy storage capacity of high-entropy ferroelectric perovskite ceramic via flash sintering

High-entropy ceramics, as a newly discovered type of material in recent years, have attracted widespread attention due to their unique structure and high-entropy effects. However, due to the sluggish diffusion effects inherent in high entropy, these ceramics require prolonged sintering at high temperatures to achieve full densification, leading to long fabrication cycles and significant energy consumption. This study utilized flash sintering to successfully obtain dense single-phase high-entropy ceramics in just 60 s while lowering the furnace temperature by 400 degrees C. Various tests demonstrate that the application of an external electric field during flash sintering promotes material diffusion and densification processes, effectively suppressing excessive grain growth and elemental volatilization. Consequently, the high-entropy ceramics (Na 0.2 Bi 0.2 Ba 0.2 Sr 0.2 Ca 0.2 )TiO 3 exhibit outstanding energy storage performance ( W rec = 5.8 J/cm3) 3 ) under moderate electric fields. This research confirms the feasibility of flash sintering in the preparation of dielectric materials for capacitors, providing a practical and cost-effective approach for the low-cost and sustainable development of the ceramic manufacturing industry.