Synergistic modulation of ferroelectric polarization and relaxor behavior of Sr₂NaNb₅O₁₅‐based tungsten bronze ceramic

Abstract

Developing dielectric ceramics with high energy storage performance (ESP) is essential for miniaturizing and integrating high‐power pulse capacitors. Sr2NaNb5O15‐based tungsten bronze ferroelectric ceramics have been highly investigated for dielectric energy storage applications recently. However, the difficulty in concurrently obtaining large polarization and strong relaxor characteristics greatly hinders the ESP improvement. In this work, Bi3+ and Ti4+ ions were introduced into the Sr2NaNb5O15 ceramic, aiming to modulate the ferroelectric polarization and relaxor behavior synergistically. An excellent recoverable energy density (Wrec ∼ 4.08 J/cm3) and a high efficiency (η ∼ 84.59%) were concurrently attained in the Sr1.85Bi0.15NaNb4.85Ti0.15O15 composition due to the boosted polarization and enhanced relaxor nature. Moreover, this ceramic also exhibited a high current density (863.06 A/cm2) and a large power density (94.94 MW/cm3). All these characteristics demonstrate that the Bi3+ and Ti4+ ions co‐doped Sr2NaNb5O15 ceramics possess great potential for dielectric capacitor applications.This article is protected by copyright. All rights reserved

Engineering Phase Separation in Niobate Glass through Ab Initio Molecular Dynamics for Enhanced Energy Storage Performance and Unprecedented Thermal Stability in Niobate-Based Glass Ceramics

“…It is noteworthy that the sample consistently exhibits slender P–E loops thanks to its robust thermal stability, the decrease in W rec and η remains below 3 and 4%, respectively, throughout the tested temperature range. In Figure i, a comparison of W rec and η between KBBNTP-2T GCs and various other tungsten bronze ceramics and glass ceramics is presented. − ,− Figure S13 also shows the stability of the KBBNTP-2T GCs sample in terms of different frequencies and cycle numbers. It can be seen that this sample shows a certain degree of stability.…”

Achieving high energy density/efficiency in light-metal-element-rich relaxor ferroelectric ceramics by annihilating volatile Schottky defects

“…6(e). 2–4,10,13,16,18,19,29–40,55 Furthermore, this ceramic shows a leading position in terms of stored/released energy per gram, and the parameter W rec / ρ (density) was subsequently introduced as a figure of merit to assess the lightweight capability. Ceramics reported in recent publications and this work are compared in terms of unit volume ( W rec ) and unit mass ( W rec / ρ ) in Fig.…”

“…Tetragonal tungsten bronze (TTB) ferroelectrics, which have a general formula of (A1) 2 (A2) 4 (C) 4 (B1) 2 (B2) 8 O 30 , feature excellent optoelectrical performance, pyroelectric properties, and piezoelectric properties. 28–37 Their abundant ion sites provide rich compositional diversity, attracting widespread research attention. Recent research progress has shown that TTB-based ceramics can achieve outstanding ESP due to their structural tunability based on which their ferroelectric behavior can be adjusted.…”