Abstract
Relaxor ferroelectric Sr0.7Bi0.2TiO3 ceramics were prepared by two types of powders synthesized by solid-state reaction (SSR) and solution combustion synthesis (SCS). The effects of the synthesis techniques of precursor powders on the microstructure, dielectric and energy storage performance of the ceramics were investigated. Compared with the SSR-derived samples, the SCS-derived ceramics show purer phase, more refined grain size, more uniform and denser morphology. Consequently, higher insulating resistivity and activation energy are obtained, thus inhibiting the carrier migration and improving the breakdown field. For the 0.1 mm-thickness ceramics via using SCS nanopowders in place of SSR powders, the critical electric field and recoverable energy density are enhanced from 320 kV/cm and 2.60 J/cm3 to 380 kV/cm and 3.60 J/cm3, respectively. Particularly, a high recoverable energy density of 5.21 J/cm3 with a high efficiency of 91.55% at 543 kV/cm is realized in the 0.04 mm-thickness SCS-derived ceramics. Meanwhile, the Vickers hardness of ceramics is promoted from ∼ 7.15 GPa to ∼ 7.80 GPa by using SSR instead of SCS method. This work suggests that SCS is an effective method to obtain precursor powders for sintering the dielectric ceramics with excellent energy storage and hardness performance.
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