LAUSR

Abstract The ferroelectric performance of Ba(Fe 0.5 Nb 0.5 )O 3 (BFN) ceramics is still controversial due to their large leakage loss. In this paper, we prepared core-shell structured Ba(Fe 0.5 Nb 0.5 )O 3 @SiO 2 particles via a wet chemistry coating method, and the core-shell structures still remain in the sinterred ceramics. Compared with pure BFN ceramic, BFN@SiO 2 composite ceramic shows dramatically suppressed dielectric loss and ac conductivity, especially measurable hysteresis loop. Through further analysis in detail, the ferroelectricity of BFN ceramics can be confirmed due to the decreased leakage loss. In addition, the internal relaxation behavior of BFN@SiO 2 samples is still consistent with pure BFN ceramics, and the impedance complex plane analysis indicated that the insulating grain boundary (or internal barrier) plays a key role to the dielectric loss decrease of the BFN ceramics.