Abstract
Lead-free relaxor ferroelectrics are a promising material owing to their excellent energy storage performance. In this work, a new lead-free ceramic system was synthesized by introducing linear dielectric Ca0.85Bi0.1TiO3 as the component modification of 0.5(Ba0.4Sr0.6TiO3)‒0.5(Bi0.5Na0.5TiO3) ceramics. All samples optimized with Ca0.85Bi0.1TiO3 showed strong relaxor behavior. Refined grain sizes and compact microstructures were observed in this pseudoternary system. Moreover, the addition of a linear dielectric decreased the Curie temperature and enhanced the breakdown strength of BST‒BNT ceramics. A high energy storage density of 2.2 J/cm3 with a good storage efficiency of 73.2% was obtained in the 0.72(0.5(Ba0.4Sr0.6TiO3)‒0.5(Bi0.5Na0.5TiO3))‒0.28Ca0.85Bi0.1TiO3 (CBT28) ceramic. Furthermore, the CBT28 ceramic maintained good temperature and frequency stability over a wide range, a feature crucial in practical applications. Results suggest the feasibility of composition modification as an approach for improving the energy storage of ceramics.
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