Simultaneous achievement of ultrahigh energy storage density and high efficiency in BiFeO₃-based relaxor ferroelectric ceramics via a highly disordered multicomponent design

Abstract

The synergistic contributions of high Pmax, small Pr and large Eb endow the BiFeO3-based ceramics with relaxor ferroelectric characteristics, due to which an ultrahigh Wrec of 13.9 J cm−3 and high η of 89.6% have been achieved synchronously.

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

“…Figure f displays the ε r and tan δ of ceramics measured under increasing frequency and ambient temperature. As the frequency rises, the decrement of ε r reveals the strong relaxation performance again . In addition, the tan δ of all ceramics retains the small values and increases quickly as elevating temperature (Figure a–d), which could be attributed to the enhanced leakage generated by increasing defects under high temperature .…”

“…As the frequency rises, the decrement of ε r reveals the strong relaxation performance again. 27 In addition, the tan δ of all ceramics retains the small values and increases quickly as elevating temperature (Figure 3a−d), which could be attributed to the enhanced leakage generated by increasing defects under high temperature. 14 The specific value of tan δ at room temperature is lower than 0.15 in the whole range of measured frequencies and tends to decrease with increasing x at low frequencies (Figure 3f), which favors to delay the energy loss caused by applied electric fields and thus hampers the thermal-induced breakdown.…”

“…The detailed experimental procedures can be found in our previous work. 27 In brief, (0.67 − x)BF−0.33BT−xNT (x = 0−0.14) ceramics were fabricated by a solid-state reaction using Bi 2 O 3 (99.9%), Fe 2 O 3 (99.9%), BaCO 3 (99.95%), TiO 2 (99%), Na 2 CO 3 (99.99%), and Ta 2 O 5 (99.5%). First, the raw materials were weighted, ball-milled, and then calcined at 800 °C for 3 h. Then, the calcined powders were ball-milled again and pressed into disks.…”

“…The detailed experimental procedures can be found in our previous work . In brief, (0.67 – x )­BF–0.33BT– x NT ( x = 0–0.14) ceramics were fabricated by a solid-state reaction using Bi 2 O 3 (99.9%), Fe 2 O 3 (99.9%), BaCO 3 (99.95%), TiO 2 (99%), Na 2 CO 3 (99.99%), and Ta 2 O 5 (99.5%).…”

Dielectric property and energy storage performance enhancement for iron niobium based tungsten bronze ceramic

“…[24][25][26][27][28][29] In perovskites, BiFeO 3 -based ceramics show considerable potential in energy storage applications, the large leakage current and lower E b induced by the reduction of Fe 3+ (Fe 3+ + e − / Fe 2+ ) can be greatly improved by chemical doping with a rare earth cation (such as La 3+ ), alkaline earth metal cation (such as Na + and Sr 2+ ) and transition metal cation (such as Nb 5+ ). [30][31][32][33] However, few studies have paid attention to the effect of Fe substitution on polarization, E b and energy storage property for tungsten bronzes. In this study, the Fe based tungsten bronze ceramic is synthesized and characterized, the effect of Fe substitution in B site on crystal structure, dielectric, ferroelectric and energy storage properties, as well as the thermal stability are explored systematically.…”