Excellent energy storage performance in Bi 0.5Na 0.5TiO 3-based lead-free high-entropy relaxor ferroelectrics via B-site modification

• DOI: 10.26599/jac.2024.9220859
• Publication Date: 2024-01-29T01:25:06Z
• Authors: Kaihua Yang; Gengguang Luo; Li Ma; Ruoxuan Che; Zhiyi Che; Qin Feng; Zhenyong Cen; Xiyong Chen; Jiajun Zhou; Nengneng Luo
• Keywords: High energy; Lead (geology)

Next-generation advanced high/pulsed power capacitors urgently require dielectric materials with outstanding energy storage performance. The Bi_0.5Na_0.5TiO₃-based lead-free material exhibit high polarization, but the remanent polarization and large hysteresis limit its application in capacitors. Herein, high-entropy perovskite relaxor ferroelectrics (Na_0.2Bi_0.2Ba_0.2Sr_0.2Ca_0.2)(Ti_{1-<em>x</em>%}Zr<em>_x</em>_%)O₃ are designed by adding multiple ions A-site replacing B-site Ti⁴⁺ a certain amount of Zr⁴⁺. newly system showed feature slim <em>P</em>-<em>E</em> loops. Especially, improved obviously delayed saturation were found increasing Of particular importance is that both recoverable density 6.6 J/cm³ efficiency 93.5% achieved under 550 kV/cm for <em>x</em> = 6 ceramic, accompanying excellent frequency stability, appreciable thermal stability prosperous discharge property. This work not only provides potential applications, also offers an effective strategy to obtain ceramics ultrahigh comprehensive performance meet demanding requirements applications.