Dielectric temperature stability and energy storage performance of NBT‐based ceramics by introducing high‐entropy oxide

Abstract

In this study, a high‐entropy perovskite oxide Sr(Zr0.2Sn0.2Hf0.2Ti0.2Nb0.2)O3 (SZSHTN) was first introduced to Na0.5Bi0.5TiO3 (NBT) lead‐free ferroelectric ceramics to boost both the high‐temperature dielectric stability and energy storage performance. Excellent comprehensive performance was simultaneously obtained in the 0.8NBT–0.2SZSHTN ceramic with high ε′ value (> 2000), wide ε′‐temperature stable range (TCC < 5%, 52.4–362°C), low tanδ value in a wide range (<0.01, 90–341°C) and high energy storage performance (Wrec = 3.52 J/cm3, Wrec and η varies ±6.08% and ±7.4% from 20 to 150°C), which endows it the promising potential to be used in high‐temperature environments.

Significantly Enhanced Energy Storage Performance of Lead-Free BiFeO3-Based Ceramics via Synergic Optimization Strategy

“…Figure summarized the key parameters for energy storage from representative lead-free dielectric ceramics, including BNT-, BT-, BF-, NN-, and AN-based ceramics. − ,,,− ,− Obviously, the relaxor ferroelectric ceramics are much easier to simultaneously realize ultrahigh W rec and high η than antiferroelectric counterparts. Nevertheless, the W rec of most ceramics is lower than 10 J/cm 3 , which not only is inferior to the most of polymer-based capacitors but also may not meet the need for the future portable electronic devices.…”

Enhanced Energy Storage Performance in Na0.5Bi0.5TiO3-Based Relaxor Ferroelectric Ceramics via Compositional Tailoring

“…Theoretically, to evaluate the energy storage performance (ESP) of a dielectric material, the energy storage density ( ) and energy storage efficiency ( ) are two major parameters, which can be deduced based on the polarization-electric field (P-E) hysteresis loops, and expressed as follows [ 4 ]. where is the saturation polarization, and the remnant polarization, the external electric field, the recoverable energy storage density, the total energy storage density, and the energy storage efficiency.…”

Enhanced Energy Density and Efficiency in Lead‐Free Sodium Niobate‐Based Relaxor Antiferroelectric Ceramics for Electrostatic Energy Storage Application

“…The comparison of electrostatic energy storage characteristic between newly investigated dielectric ceramics and x = 0.12 is exhibited in Figure . [ 8,9,11–13,17,19,21,24,34,36,38,40–77 ] The Bi 0.5 Na 0.5 TiO 3 (BNT)‐, BaTiO 3 (BT)‐ and BiFeO 3 (BF)‐based relaxor ferroelectric ceramics generally exhibit high η (>80%), but the W rec is limited by relatively low E b (<60 kV mm −1 ). In addition, the normal antiferroelectric ceramics suffer from low η (<80%).…”