RFE/RAFE multilayer composite ceramics with excellent dielectric bias-field stability

Abstract

Due to their high dielectric and polarization response, relaxor ferroelectric (RFE) ceramics have been extensively studied as matrices for dielectric energy-storage (ES) materials. However, poor dielectric bias-field stability presents a significant bottleneck for their application and further enhancement of ES performance. Here, we propose a novel approach to address this issue. By employing a mesoscale stacked structure design, we integrate RFE and relaxor antiferroelectric (RAFE) materials to create multilayer composite ceramics that optimize dielectric properties. Specifically, we utilize 0.5(Bi_0.5Na_0.4K_0.1)TiO₃-0.5[2/3SrTiO₃-1/3Bi(Mg_1/3Nb_2/3)O₃] as the RFE matrix and (Pb_0.95La_0.02Sr_0.02)(Zr_0.5Sn_0.4Ti_0.1)O₃ as the RAFE matrix. This combination achieves a stable dielectric permittivity of approximately 900 across an electric field range of ± 150 kV/cm, with fluctuations under ± 15 %. The composite also exhibits remarkable ES performance, with a recoverable ES density of 6.14 J/cm³ and efficiency of 86.7 % under 430 kV/cm. Our findings offer a reliable solution for multilayer ceramic capacitors and advance dielectric materials in high-voltage applications.