Simultaneously enhanced energy density and discharge efficiency of (Na_0.5Bi_0.5)_0.7Sr_0.3TiO₃-La_1/3(Ta_0.5Nb_0.5)O₃ lead-free energy storage ceramics via grain inhibition and dielectric peak flattening engineering

Abstract

Energy storage ceramics are widely favored for their rapid charging/discharging speed, good temperature stability and large power density. Nevertheless, most of lead-free energy storage ceramics can achieve excellent energy storage...

Dielectric, Ferroelectric, and High-Temperature Strain Behavior of Rare Earth Ce-Doped 0.67BiFeO3–0.33BaTiO3 Lead-Free Ferroelectric Ceramics

“…As x increased, the samples exhibited significant dielectric frequency dispersion, with the peak temperature ( T m ) decreasing as the frequency decreased. This confirms the relaxor behavior of BF–BT–Ce ceramics, indicating a transition from normal ferroelectric material to a relaxor ferroelectric material . It is evident from the text that the decrease in T m with increasing x is attributed to the introduction of Ce 4+ doping in lead-free BF-BT ceramics, resulting in lattice irregularities that adversely affect the formation and stability of the electric dipole moment.…”

“…This confirms the relaxor behavior of BF−BT−Ce ceramics, indicating a transition from normal ferroelectric material to a relaxor ferroelectric material. 29 It is evident from the text that the decrease in T m with increasing x is attributed to the introduction of Ce 4+ doping in lead-free BF-BT ceramics, resulting in lattice irregularities that adversely affect the formation and stability of the electric dipole moment. This ultimately disrupts the stability of the ferroelectric phase, leading to a reduction in the T m .…”

High energy storage density achieved in BNT‐based ferroelectric translucent ceramics under low electric fields

“…Although the sample with x = 0.5 demonstrate higher η (∼86.9%), their lack of dipoles results in a minimal contribution of the electric field to the polarization intensity. A comparison of W rec between the 0.9BNT–0.1BZT:0.6Er 3+ ceramic in this work and previously published works for other lead‐free ferroelectric ceramics at a lower electric field is shown in Figure 8 13,41,53–72 . Table 2 presents another comparison of energy storage ability ( P max and W rec / E ) 11,34,63,73–77 .…”

“…A comparison of W rec between the 0.9BNT-0.1BZT:0.6Er 3+ ceramic in this work and previously published works for other lead-free ferroelectric ceramics at a lower electric field is shown in Figure 8. 13,41,[53][54][55][56][57][58][59][60][61][62][63][64][65][66][67][68][69][70][71][72] Table 2 presents another comparison of energy storage ability (P max and W rec /E). 11,34,63,[73][74][75][76][77] The results show that this work has reached an advanced level with a W rec of 2.95 J/cm 3 and W rec /E of 155.26 J/(kVˑm 2 ) at a low electric field (190 kV/cm).…”