Tailoring Phase Fraction Induced Saturation Polarization Delay for High-Performance BaTiO<sub>3</sub>-Based Relaxed Ferroelectric Capacitors
Xiqi Chen, Zhongbin Pan, Yong Zhang, Huanhuan Li, Jinghao Zhao, Luomeng Tang, Jinjun Liu, Peng Li, Jiwei Zhai
Abstract
Electrostatic capacitors based on dielectric materials are essential for enabling technological advances, including miniaturization and integration of electronic devices. However, maintaining a high polarization and breakdown field strength simultaneously in electrostatic capacitors remains a major challenge for industrial applications. Herein, a universal approach to delaying saturation polarization in BaTiO 3 -based ceramic is reported via tailoring phase fraction to improve capacitive performance. The ceramic of 0.85(0.7BaTiO 3 -0.3Bi 0.5 Na 0.5 TiO 3 )-0.15Bi 0.5 Li 0.5 (Ti 0.75 Ta 0.2 )O 3 delivers an ultrahigh recoverable energy density ( W rec ) of 7.16 J cm –3 along with an efficiency (η) of approximately 90% at a breakdown electric field of 700 kV cm –1, outperforming the current BaTiO 3 -based ceramics and other lead-free ceramics. Meanwhile, the W rec and η exhibit wide frequency, temperature, and cycling fatigue stability. Additionally, both an extremely fast discharge time of 115 ns and a large power density of 106.16 MW cm –3 are concurrently attained. This work offers a promising pathway for delaying saturation polarization design in order to create scalable high-energy-density ceramics capacitors and highlight the research prospects of pulse power applications.