Abstract
Exploring eco-friendly energy-storage ceramics simultaneously featuring large recoverable energy storage density (Wrec), high energy storage efficiency (ƞ), and excellent temperature/frequency stabilities is highly desirable for the applications of pulsed power systems. Herein, AgNb0.85Ta0.15O3 was used to modify Na0.5Bi0.5TiO3 based lead-free relaxor ferroelectric ceramics in an effort to enhance the breakdown electric field strength. The ceramics (1-x)(0.75Na0.5Bi0.5TiO3-0.25SrTiO3)-xAg(Nb0.85Ta0.15)O3 (x = 0, 0.05, 0.1, and 0.15) were prepared by the conventional solid-state reaction method. The microstructure, dielectric, and energy storage properties of all the ceramics have been systematically studied. Our results show that the introduction of AgNb0.85Ta0.15O3 leads to a homogeneous microstructure and small grain size, thereby increasing the strength of the dielectric breakdown field (29 kV/mm). In addition, it can also decompose the macroscopic long-range ferroelectric order into randomly-oriented polar nano-regions (PNRS), resulting in a board diffusive phase. A large Wrec (3.6 J/cm3) and high ƞ (80%) as well as excellent temperature and frequency stabilities were simultaneously achieved in the sample with x = 0.1. This work provides a feasible method for designing lead-free ceramics with high energy storage performances.
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